ADOPTS WITH AMENDMENTS:

International Building Code 2018 (IBC 2018)

Heads up: There are no amended sections in this chapter.

14B-15-1501 The provisions of Section 1501 of IBC are adopted by reference with the following modification:

Added Coun. J. 4-10-19, p. 100029.

The provisions of this chapter shall govern the design, materials, construction and quality of roof assemblies, and rooftop structures.
Dormers shall either be of the same type of construction as required for the roof assembly in which such dormers are located or the same type of construction as required for the exterior walls of the building.

14B-15-1502 The provisions of Section 1502 of IBC are adopted by reference with the following modifications:

Added Coun. J. 4-10-19, p. 100029.

Amended Coun. J. 7-24-19, p. 3647.

Amended Coun. J. 2-19-20, p. 14474.

Design and installation of roof drainage systems shall comply with Section 1502 of this code and Section 1106 of the Chicago Plumbing Code.

Gutters and leaders placed on the exterior of buildings, shall be of noncombustible material.

Exceptions:

  1. One-story buildings.
  2. Buildings of Group R occupancy with no more than 4 stories above grade plane.
  3. Buildings of Type V construction.

14B-15-1503 The provisions of Section 1503 of IBC are adopted by reference with the following modification:

Added Coun. J. 4-10-19, p. 100029.

Roof decks shall be covered with roof coverings secured to the building or structure in accordance with the provisions of this chapter. Roof coverings shall be designed in accordance with this code, and installed in accordance with this code and the manufacturer's instructions.

Flashing shall be installed in such a manner so as to prevent water from entering the wall and roof through joints in copings, through moisture-permeable materials and at intersections with parapet walls and other penetrations through the roof plane.

1503.2.1 Locations

ILLUSTRATION
Flashing shall be installed at wall and roof intersections, at gutters, wherever there is a change in roof slope or direction and around roof openings. Where flashing is of metal, the metal shall be corrosion resistant with a thickness of not less than 0.019 inch (0.483 mm) (No. 26 galvanized sheet).

1503.3 Coping

ILLUSTRATION
Parapet walls shall be properly coped with noncombustible, weatherproof materials of a width not less than the thickness of the parapet wall.
Intake and exhaust vents shall be provided in accordance with Section 1202.2 and the vent product manufacturer's installation instructions.

A cricket or saddle shall be installed on the ridge side of any chimney or penetration greater than 30 inches (762 mm) wide as measured perpendicular to the slope. Cricket or saddle coverings shall be sheet metal or of the same material as the roof covering.

Exception: Unit skylights installed in accordance with Section 2405.5 and flashed in accordance with the manufacturer's instructions shall be permitted to be installed without a cricket or saddle.

14B-15-1504 The provisions of Section 1504 of IBC are adopted by reference with the following modifications:

Added Coun. J. 4-10-19, p. 100029.

Amended Coun. J. 2-19-20, p. 14474.

Roof decks and roof coverings shall be designed for wind loads in accordance with Chapter 16 and Sections 1504.2, 1504.3 and 1504.4.

Asphalt shingles shall be tested in accordance with ASTM D7158 and have a classification of D, G or H. Asphalt shingle packaging shall bear a label to indicate compliance with ASTM D7158 and the required classification.

Exception: Asphalt shingles not included in the scope of ASTM D7158 shall be tested and labeled in accordance with ASTM D3161 and have a classification of A, D or F. Asphalt shingle packaging shall bear a label to indicate compliance with ASTM D3161 and the required classification.

Testing of concrete and clay roof tiles shall be in accordance with Sections 1504.2.1.1 and 1504.2.1.2.
Concrete and clay roof tiles shall be tested to determine their resistance to overturning due to wind in accordance with Chapter 15 and either SBCCI SSTD 11 or ASTM C1568.
Where concrete and clay roof tiles do not satisfy the limitations in Chapter 16 for rigid tile, a wind tunnel test shall be used to determine the wind characteristics of the concrete or clay tile roof covering in accordance with SBCCI SSTD 11 and Chapter 15.
Roof coverings installed on roofs in accordance with Section 1507 that are mechanically attached or adhered to the roof deck shall be designed to resist the design wind load pressures for components and cladding in accordance with Section 1609.5.2. The wind load on the roof covering shall be permitted to be determined using allowable stress design.
Built-up, modified bitumen, fully adhered or mechanically attached single-ply roof systems, metal panel roof systems applied to a solid or closely fitted deck and other types of membrane roof coverings shall be tested in accordance with FM 4474, UL 580 or UL 1897.

Where the metal roof panel functions as the roof deck and roof covering and it provides both weather protection and support for loads, the structural metal panel roof system shall comply with this section. Structural standing-seam metal panel roof systems shall be tested in accordance with ASTM E1592 or FM 4474. Structural through-fastened metal panel roof systems shall be tested in accordance with ASTM E1592, FM 4474 or UL 580.

Exceptions:

  1. Metal roofs constructed of cold-formed steel shall be permitted to be designed and tested in accordance with the applicable referenced structural design standard in Section 2210.1.
  2. Metal roofs constructed of aluminum shall be permitted to be designed and tested in accordance with the applicable referenced structural design standard in Section 2002.1.
Metal roof shingles applied to a solid or closely fitted deck shall be tested in accordance with ASTM D3161, FM 4474, UL 580 or UL 1897. Metal roof shingles tested in accordance with ASTM D3161 shall meet the classification requirements of Table 1504.1.1 for the appropriate maximum basic wind speed and the metal shingle packaging shall bear a label to indicate compliance with ASTM D3161 and the required classification in Table 1504.1.1.
Ballasted low-sloped roof single-ply roof system coverings installed in accordance with Sections 1507.12 and 1507.13 shall be designed in accordance with Section 1504.8 and ANSI/SPRI RP-4.
Low-sloped roof built-up, modified bitumen and single-ply roof system metal edge securement, except gutters, shall be designed and installed for wind loads in accordance with Chapter 16 and tested for resistance in accordance with Test Methods RE-1, RE-2 and RE-3 of ANSI/SPRI ES-1, except basic design wind speed, V, shall be determined from Section 1609.3.
Roof coverings installed on low-sloped roofs in accordance with Section 1507 shall demonstrate physical integrity over the working life of the roof based on 2,000 hours of exposure to accelerated weathering tests conducted in accordance with ASTM G152, ASTM G154 or ASTM G155. Those roof coverings that are subject to cyclical flexural response due to wind loads shall not demonstrate any significant loss of tensile strength for unreinforced membranes or breaking strength for reinforced membranes when tested as herein required.

Roof coverings installed on low-sloped roofs in accordance with Section 1507 shall resist impact damage based on the results of tests conducted in accordance with ASTM D3746, ASTM D4272 or the "Resistance to Foot Traffic Test" in Section 4.6 of FM 4470.

Editor's Note—Errata to the model code modifies the text in 14B-15-1504.7 from "Section 5.5 of FM 4470" to "Section 4.6 of FM 4470." At the discretion of the editor, this text has been changed herein. Future legislation will correct this provision if needed.

For a building with a mean roof height exceeding that permitted by Table 1504.8 based on the exposure category, the following materials shall not be used on the roof:

  1. Aggregate used as surfacing for roof coverings.
  2. Aggregate, gravel or stone used as ballast.

TABLE 1504.8

MAXIMUM ALLOWABLE MEAN ROOF HEIGHT PERMITTED FOR BUILDINGS WITH AGGREGATE ON THE ROOF

RISK CATEGORYb MEAN ROOF HEIGHT (ft)a
Exposure categoryc
B C D
I or II 55 55 30
III 55 40 20
IV 55 25 NP

For SI: 1 foot = 304.8 mm

NP = gravel and stone not permitted for any roof height.

  1. Mean roof height as defined in ASCE 7.
  2. Risk category shall be determined in accordance with Section 1604.5.
  3. Exposure category shall be determined in accordance with Section 1609.4.3.

14B-15-1505 The provisions of Section 1505 of IBC are adopted by reference with the following modifications:

Added Coun. J. 4-10-19, p. 100029.

Amended Coun. J. 2-19-20, p. 14474.

Roof assemblies shall be divided into the classes defined in this section. Class A, B and C roof assemblies and roof coverings required to be listed by this section shall be tested in accordance with ASTM E108 or UL 790. In addition, fire-retardant-treated wood roof coverings shall be tested in accordance with ASTM D2898. The minimum roof coverings installed on buildings shall comply with Table 1505.1 based on the type of construction of the building.

Exception: Skylights and sloped glazing that comply with Chapter 24 or Section 2610.

TABLE 1505.1a, b

MINIMUM ROOF COVERING CLASSIFICATION FOR TYPES OF CONSTRUCTION

IA IB IIA IIB IIIA IIIB IV VA VB
B B B B B Cc B B Cc

For SI: 1 foot = 304.8 mm, 1 square foot = 0.0929 m2.

  1. Unless otherwise required due to the location of the building within a fire district in accordance with Appendix D.
  2. Class C roof coverings shall be allowed on buildings of Group R-3, R-4, R-5 and Group U occupancies, where there is a minimum fire-separation distance of 6 feet measured from the leading edge of the roof.
  3. Buildings that are not more than two stories above grade plane and having not more than 6,000 square feet of projected roof area and where there is a minimum 10-foot fire separation distance from the leading edge of the roof to an abutting property line on all sides of the building, shall be allowed to have roofs of fire-retardant-treated wood shingles and shakes constructed in accordance with Section 1505.6 or No. 1 cedar or redwood shakes and No. 1 shingles constructed in accordance with Section 1505.7.

Class A roof assemblies are those that are effective against severe fire test exposure. Class A roof assemblies and roof coverings shall be listed and identified as Class A by an approved agency. Class A roof assemblies shall be permitted for use in buildings or structures of all types of construction.

Exceptions:

  1. Class A roof assemblies include those with coverings of brick, masonry or an exposed concrete roof deck.
  2. Class A roof assemblies also include ferrous or copper shingles or sheets, metal sheets and shingles, clay or concrete roof tile or slate installed on noncombustible decks or ferrous, copper or metal sheets installed without a roof deck on noncombustible framing.
  3. Class A roof assemblies include minimum 16 ounce per square foot (0.0416 kg/m2) copper sheets installed over combustible roof decks.
  4. Class A roof assemblies include slate installed over ASTM D226, Type II underlayment over combustible roof decks.
Class B roof assemblies are those that are effective against moderate fire-test exposure. Class B roof assemblies and roof coverings shall be listed and identified as Class B by an approved agency.
Class C roof assemblies are those that are effective against light fire-test exposure. Class C roof assemblies and roof coverings shall be listed and identified as Class C by an approved agency.
Fire-retardant-treated wood shakes and shingles shall be treated by impregnation with chemicals by the full-cell vacuum-pressure process, in accordance with AWPA C1. Each bundle shall be marked to identify the manufactured unit and the manufacturer, and shall be labeled to identify the classification of the material in accordance with the testing required in Section 1505.1, the treating company and the quality control agency.
Special purpose wood shingle or wood shake roofing shall conform to the grading and application requirements of Section 1507.8 or 1507.9. In addition, an underlayment of 5/8-inch (15.9 mm) Type X water-resistant gypsum backing board or gypsum sheathing shall be placed under minimum nominal 1/2-inch-thick (12.7 mm) wood structural panel solid sheathing or 1-inch (25 mm) nominal spaced sheathing.
Building-integrated photovoltaic products installed as the roof covering shall be tested, listed and labeled for fire classification in accordance with Section 1505.1.
Rooftop rack-mounted photovoltaic panel systems shall be tested, listed and identified with a fire classification in accordance with UL 1703 and UL 2703. The fire classification shall comply with Table 1505.1 based on the type of construction of the building.
Vegetative roofs, roof gardens and landscaped roofs shall comply with Sections 1507.16 and 1514.

14B-15-1506 The provisions of Section 1506 of IBC are adopted by reference with the following modification:

Added Coun. J. 4-10-19, p. 100029.

Amended Coun. J. 2-19-20, p. 14474.

The requirements set forth in this section shall apply to the application of roof-covering materials specified herein. Roof coverings shall be applied in accordance with this chapter and the manufacturer's installation instructions. Installation of roof coverings shall comply with the applicable provisions of Section 1507.
Roof-covering materials shall conform to the applicable standards listed in this chapter.
Roof-covering materials shall be delivered in packages bearing the manufacturer's identifying marks and approved agency labels required in accordance with Section 1505. Bulk shipments of materials shall be accompanied with the same information issued in the form of a certificate or on a bill of lading by the manufacturer.

14B-15-1507 The provisions of Section 1507 of IBC are adopted by reference with the following modifications:

Added Coun. J. 4-10-19, p. 100029.

Amended Coun. J. 2-19-20, p. 14474.

Roof coverings shall be applied in accordance with the applicable provisions of this section and the manufacturer's installation instructions.

Underlayment for asphalt shingles, clay and concrete tile, metal roof shingles, mineral-surfaced roll roofing, slate and slate-type shingles, wood shingles, wood shakes, metal roof panels and photovoltaic shingles shall conform to the applicable standards listed in this chapter. Underlayment materials required to comply with ASTM D226, D1970, D4869 and D6757 shall bear a label indicating compliance with the standard designation and, if applicable, type classification indicated in Table 1507.1.1(1). Underlayment shall be applied in accordance with Table 1507.1.1(2). Underlayment shall be attached in accordance with Table 1507.1.1(3).

Exceptions:

  1. As an alternative, self-adhering polymer modified bitumen underlayment complying with ASTM D1970 and installed in accordance with the manufacturer's installation instructions for the deck material, roof ventilation configuration and climate exposure for the roof covering to be installed shall be permitted.
  2. As an alternative, a minimum 4-inch-wide (102 mm) strip of self-adhering polymer modified bitumen membrane complying with ASTM D1970 and installed in accordance with the manufacturer's installation instructions for the deck material shall be applied over all joints in the roof decking. An approved underlayment for the applicable roof covering for design wind speeds less than 120 mph (54 m/s) shall be applied over the 4-inch-wide (102 mm) membrane strips.
  3. As an alternative, two layers of underlayment complying with ASTM D226 Type II or ASTM D4869 Type IV shall be permitted to be installed as follows: Apply a 19-inch (483 mm) strip of underlayment parallel with the eave. Starting at the eave, apply 36-inch-wide (914 mm) strips of underlayment felt, overlapping successive sheets 19 inches (483 mm). The underlayment shall be attached with corrosion-resistant fasteners in a grid pattern of 12 inches (305 mm) between side laps with a 6-inch (152 mm) spacing at side and end laps. End laps shall be 4 inches (102 mm) and shall be offset by 6 feet (1829 mm). Underlayment shall be attached using metal or plastic cap nails with a nominal cap diameter of not less than 1 inch (25.4 mm). Metal caps shall have a thickness of not less than 32-gage sheet metal. Power-driven metal caps shall have a thickness of not less than 0.010 inch (mm). Thickness of the outside edge of plastic caps shall be not less than 0.035 inch (mm). The cap nail shank shall be not less than 0.083 inch for ring shank cap nails and 0.091 inch (mm) for smooth shank cap nails. The cap nail shank shall have a length sufficient to penetrate through the roof sheathing or not less than 3/4 inch (19.1 mm) into the roof sheathing.
  4. Structural metal panels that do not require a substrate or underlayment.

TABLE 1507.1.1(1)

UNDERLAYMENT TYPES

ROOF COVERING SECTION INSTALLATION STANDARD
Asphalt shingles 1507.2 ASTM D226 Type I or II
ASTM D4869 Type I, II, III or IV
ASTM D6757
Clay and concrete tiles 1507.3 ASTM D226 Type II ASTM D2626 Type I
ASTM D6380 Class M
mineral surfaced roll roofing
Metal panels 1507.4 Manufacturer's instructions
Metal roof shingles 1507.5 ASTM D226 Type I or II
ASTM D4869 Type I, II, III or IV
Mineral-surfaced roll roofing 1507.6 ASTM D226 Type I or II
ASTM D4869 Type I, II, III or IV
Slate shingles 1507.7 ASTM D226 Type II
ASTM D4869 Type III or IV
Wood shingles 1507.8 ASTM D226 Type I or II
ASTM D4869 Type I, II, III or IV
Wood shakes 1507.9 ASTM D226 Type I or II
ASTM D4869 Type I, II, III or IV
Photovoltaic shingles 1507.17 ASTM D226 Type I or II
ASTM D4869 Type I, II, III or IV
ASTM D6757

TABLE 1507.1.1(2)

UNDERLAYMENT APPLICATION

ROOF COVERING SECTION INSTALLATION STANDARD
Asphalt
shingles
1507.2
For roof slopes from two units vertical in 12 units horizontal (2:12), up to four units vertical in 12
units horizontal (4:12), underlayment shall be two layers applied as follows: Apply a 19-inch strip of
underlayment felt parallel to and starting at the eaves. Starting at the eave, apply 36-inch-wide sheets
of underlayment, overlapping successive sheets 19 inches. End laps shall be 4 inches and shall be
offset by 6 feet. Distortions in the underlayment shall not interfere with the ability of the shingles to
seal.
For roof slopes of four units vertical in 12 units horizontal (4:12) or greater, underlayment shall
be one layer applied as follows: underlayment shall be applied shingle fashion, parallel to and
starting from the eave and lapped 2 inches, Distortions in the underlayment shall not interfere
with the ability of the shingles to seal. End laps shall be 4 inches and shall be offset by 6 feet.
Clay and concrete tile 1507.3 For roof slopes from two and one-half units vertical in 12 units horizontal (21/2:12), up to four
units vertical in 12 units horizontal (4:12), underlayment shall be not fewer than two layers
applied as follows: Starting at the eave, a 19-inch strip of underlayment shall be applied parallel
with the eave. Starting at the eave, a 36-inch-wide strip of underlayment felt shall be applied,
overlapping successive sheets 19 inches. End laps shall be 4 inches and shall be offset by 6 feet.
For roof slopes of four units vertical in 12 units horizontal (4:12) or greater, underlayment shall
be one layer applied as follows: Underlayment shall be applied shingle fashion, parallel to and
starting from the eave and lapped 2 inches. End laps shall be 4 inches and shall be offset by 6
feet.
Metal roof panels 1507.4 Apply in accordance with the
manufacturer's installation instructions
Metal roof shingles 1507.5
Mineral-
surfaced roll roofing
1507.6
Slate
shingles
1507.7
Wood shakes 1507.8
Wood
shingles
1507.9
Photovoltaic shingles 1507.17 For roof slopes from three units vertical in 12 units horizontal (3:12), up to four units vertical in
12 units horizontal (4:12), underlayment shall be two layers applied as follows: Apply a 19-inch
strip of underlayment felt parallel to and starting at the eaves. Starting at the eave, apply 36-inch-
wide sheets of underlayment, overlapping successive sheets 19 inches. End laps shall be 4 inches
and shall be offset by 6 feet. Distortions in the underlayment shall not interfere with the ability of
the shingles to seal.
For roof slopes of four units vertical in 12 units horizontal (4:12) or greater, underlayment shall
be one layer applied as follows: Underlayment shall be applied shingle fashion, parallel to and
starting from the eave and lapped 2 inches. Distortions in the underlayment shall not interfere
with the ability of the shingles to seal. End laps shall be 4 inches and shall be offset by 6 feet.

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm; 1 mile per hour = 0.447 m/s.

TABLE 1507.1.1(3)

UNDERLAYMENT ATTACHMENT

ROOF
COVERING
SECTION INSTALLATION STANDARD
Asphalt
shingles
1507.2 Fastened sufficiently to hold in place
Clay and 1507.3
Photovoltaic shingles 1507.17
Metal roof panels 1507.4 Manufacturer's installation instructions
Metal roof shingles 1507.5
Mineral-
surfaced roll roofing
1507.6
Slate shingles 1507.7
Wood shingles 1507.8
Wood shakes 1507.9

For SI: 1 inch = 25.4 mm; 1 mile per hour = 0.447 m/s.

At eaves, an ice barrier shall be installed for asphalt shingles, metal roof shingles, mineral-surfaced roll roofing, slate and slate-type shingles, wood shingles and wood shakes. The ice barrier shall consist of not less than two layers of underlayment cemented together, or a self-adhering polymer modified bitumen sheet shall be used in place of normal underlayment and extend from the lowest edges of all roof surfaces to a point not less than 24 inches (610 mm) inside the exterior wall line of the building.

Exception: Detached accessory structures that do not contain conditioned floor area.

The installation of asphalt shingles shall comply with the provisions of this section.
Asphalt shingles shall be fastened to solidly sheathed decks.
Asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal (17-percent slope) or greater. For roof slopes from two units vertical in 12 units horizontal (17-percent slope) up to four units vertical in 12 units horizontal (33-percent slope), double underlayment application is required in accordance with Section 1507.2.8.
Asphalt shingles shall comply with ASTM D3462.
Fasteners for asphalt shingles shall be galvanized, stainless steel, aluminum or copper roofing nails, minimum 12-gage [0.105 inch (2.67 mm)] shank with a minimum 3/8-inch-diameter (9.5 mm) head, of a length to penetrate through the roofing materials and not less than 3/4 inch (19.1 mm) into the roof sheathing. Where the roof sheathing is less than 3/4 inch (19.1 mm) thick, the nails shall penetrate through the sheathing. Fasteners shall comply with ASTM F1667.
Asphalt shingles shall have the minimum number of fasteners required by the manufacturer, but not less than four fasteners per strip shingle or two fasteners per individual shingle. Where the roof slope exceeds 21 units vertical in 12 units horizontal (21:12), shingles shall be installed as required by the manufacturer.

1507.2.7 Ice Barrier

ILLUSTRATION
Where required, ice barriers shall comply with Section 1507.1.2.
Flashing for asphalt shingles shall comply with this section. Flashing shall be applied in accordance with this section and the asphalt shingle manufacturer's printed instructions.
Base and cap flashing shall be installed in accordance with the manufacturer's instructions. Base flashing shall be of either corrosion-resistant metal of minimum nominal 0.019-inch (0.483 mm) thickness or mineral-surfaced roll roofing weighing not less than 77 pounds per 100 square feet (3.76 kg/m2). Cap flashing shall be corrosion-resistant metal of minimum nominal 0.019-inch (0.483 mm) thickness.

1507.2.8.2 Valleys

ILLUSTRATION

Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles. Valley linings of the following types shall be permitted:

  1. For open valleys (valley lining exposed) lined with metal, the valley lining shall be not less than 24 inches (610 mm) wide and of any of the corrosion-resistant metals in Table 1507.2.8.2.
  2. For open valleys, valley lining of two plies of mineral-surfaced roll roofing complying with ASTM D3909 or ASTM D6380 shall be permitted. The bottom layer shall be 18 inches (457 mm) and the top layer not less than 36 inches (914 mm) wide.
  3. For closed valleys (valleys covered with shingles), valley lining of one ply of smooth roll roofing complying with ASTM D6380, and not less than 36 inches (914 mm) wide or types as described in Item 1 or 2 above shall be permitted. Self-adhering polymer modified bitumen underlayment bearing a label indicating compliance with ASTM D1970 shall be permitted in lieu of the lining material.

TABLE 1507.2.8.2

VALLEY LINING MATERIAL

MATERIAL MINIMUM THICKNESS GAGE WEIGHT
Aluminum 0.024 in.
Cold-rolled copper 0.0216 in. ASTM B370, 16 oz. per square ft.
Copper 16 oz
Galvanized steel 0.0179 in. 26 (zinc-coated G90)
High-yield copper 0.0162 in. ASTM B370, 12 oz. per square ft.
Stainless steel 28
Zinc alloy 0.027 in.

For SI: 1 inch = 25.4 mm, 1 pound = 0.454 kg, 1 ounce = 28.35 g, 1 square foot = 0.0929 m2.

A drip edge shall be provided at eaves and rake edges of shingle roofs. Adjacent segments of the drip edge shall be lapped not less than 2 inches (51 mm). The vertical leg of drip edges shall be not less than 11/2 inches (38 mm) in width and shall extend not less than 1/4 inch (6.4 mm) below sheathing. The drip edge shall extend back on the roof not less than 2 inches (51 mm). Underlayment shall be installed over drip edges along eaves. Drip edges shall be installed over underlayment along rake edges. Drip edges shall be mechanically fastened at intervals not greater than 12 inches (305 mm) on center.
The installation of clay and concrete tile shall comply with the provisions of this section.
Concrete and clay tile shall be installed only over solid sheathing or spaced structural sheathing boards.
Clay and concrete roof tile shall be installed on roof slopes of 21/2 units vertical in 12 units horizontal (21-percent slope) or greater. For roof slopes from 21/2 units vertical in 12 units horizontal (21-percent slope) to four units vertical in 12 units horizontal (33-percent slope), double underlayment application is required in accordance with Section 1507.3.3.
Unless otherwise noted, required underlayment shall conform to: ASTM D226, Type II; ASTM D2626 or ASTM D6380, Class M mineral-surfaced roll roofing.
Clay roof tile shall comply with ASTM C1167.
Concrete roof tile shall comply with ASTM C1492.
Tile fasteners shall be corrosion resistant and not less than 11-gage, 5/16-inch (8.0 mm) head, and of sufficient length to penetrate the deck not less than 3/4 inch (19.1 mm) or through the thickness of the deck, whichever is less. Attaching wire for clay or concrete tile shall not be smaller than 0.083 inch (2.1 mm). Perimeter fastening areas include three tile courses but not less than 36 inches (914 mm) from either side of hips or ridges and edges of eaves and gable rakes.

Clay and concrete roof tiles shall be fastened in accordance with Table 1507.3.7.

TABLE 1507.3.7

CLAY AND CONCRETE TILE ATTACHMENTa, b, c

GENERAL - CLAY OR CONCRETE ROOF TILE
Maximum Allowable Stress
Design Wind Speed, Vasd f
(mph)
Mean roof height
(feet)
Roof slope < 3:12 Roof slope 3:12 and over
85 0-60 One fastener per tile. Flat tile
without vertical laps, two
fasteners per tile.
Two fasteners per tile. Only one fastener on slopes of 7:12
and less for tiles with installed weight exceeding 7.5 lbs./sq.
ft. having a width not more than 16 inches.
100 0-40
100 > 40-60 The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with
approved clips. Rake tiles shall be nailed with two nails. The nose of all ridge, hip and rake
tiles shall be set in a bead of roofer's mastic.
110 0-60 The fastening system shall resist the wind forces in Section 1609.5.3.
120 0-60 The fastening system shall resist the wind forces in Section 1609.5.3.
130 0-60 The fastening system shall resist the wind forces in Section 1609.5.3.
All > 60 The fastening system shall resist the wind forces in Section 1609.5.3.
INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGSd, e
(Installations on spaced/solid sheathing with battens or spaced sheathing)
Maximum Allowable Stress
Design Wind Speed, Vasd f
(mph)
Mean roof height
(feet)
Roof slope < 5:12 Roof slope 5:12 < 12:12 Roof slope
12:12 and over
85 0-60 Fasteners are not required.
Tiles with installed weight
less than 9 lbs./sq. ft. require
not fewer than one fastener
per tile.
One fastener per tile every
other row. Perimeter tiles
require one fastener. Tiles
with installed weight less than
9 lbs./sq. ft. require not fewer
than one fastener per tile.
One fastener required for
every tile. Tiles with installed
weight less than 9 lbs./sq. ft.
require not fewer than one
fastener per tile.
100 0-40
100 > 40-60 The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with
approved clips. Rake tiles shall be nailed with two nails. The nose of all ridge, hip and rake
tiles shall be set in a bead of roofer's mastic.
110 0-60 The fastening system shall resist the wind forces in Section 1609.5.3.
120 0-60 The fastening system shall resist the wind forces in Section 1609.5.3.
130 0-60 The fastening system shall resist the wind forces in Section 1609.5.3.
All > 60 The fastening system shall resist the wind forces in Section 1609.5.3.
INTERLOCKING CLAY OR CONCRETE ROOF TILE WITH PROJECTING ANCHOR LUGS
(Installations on solid sheathing without battens)
Maximum Allowable Stress
Wind Speed, Vasd f
(mph)
Mean roof height
(feet)
All roof slopes
85 0-60 One fastener per tile.
100 0-40 One fastener per tile.
100 > 40-60 The head of all tiles shall be nailed. The nose of all eave tiles shall be fastened with
approved clips. Rake tiles shall be nailed with two nails. The nose of all ridge, hip and rake
tiles shall be set in a bead of roofer's mastic.
110 0-60 The fastening system shall resist the wind forces in Section 1609.5.3.
120 0-60 The fastening system shall resist the wind forces in Section 1609.5.3.
130 0-60 The fastening system shall resist the wind forces in Section 1609.5.3.
All > 60 The fastening system shall resist the wind forces in Section 1609.5.3.

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s, 1 pound per square foot = 4.882 kg/m2.

  1. Minimum fastener size. Corrosion-resistant nails not less than No. 11 gage with 5/16-inch head. Fasteners shall be long enough to penetrate into the sheathing 3/4 inch or through the thickness of the sheathing, whichever is less. Attaching wire for clay and concrete tile shall not be smaller than 0.083 inch.
  2. Snow areas. Not fewer than two fasteners per tile are required or battens and one fastener.
  3. Roof slopes greater than 24:12. The nose of all tiles shall be securely fastened.
  4. Horizontal battens. Battens shall be not less than 1 inch by 2 inch nominal. Provisions shall be made for drainage by a riser of not less than 1/8 inch at each nail or by 4-foot-long battens with not less than a 1/2-inch separation between battens. Horizontal battens are required for slopes over 7:12.
  5. Perimeter fastening areas include three tile courses but not less than 36 inches from either side of hips or ridges and edges of eaves and gable rakes.
  6. Vasd shall be determined in accordance with Section 1609.3.1.

Tile shall be applied according to the manufacturer's installation instructions, based on the following:

  1. Climatic conditions.
  2. Roof slope.
  3. Underlayment system.
  4. Type of tile being installed.

1507.3.9 Flashing

ILLUSTRATION
At the juncture of the roof vertical surfaces, flashing and counterflashing shall be provided in accordance with the manufacturer's installation instructions, and where of metal, shall be not less than 0.019-inch (0.48 mm) (No. 26 galvanized sheet gage) corrosion-resistant metal. The valley flashing shall extend not less than 11 inches (279 mm) from the centerline each way and have a splash diverter rib not less than 1 inch (25 mm) high at the flow line formed as part of the flashing. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). For roof slopes of three units vertical in 12 units horizontal (25-percent slope) and over, the valley flashing shall have a 36-inch-wide (914 mm) underlayment of either one layer of Type I underlayment running the full length of the valley, or a self-adhering polymer-modified bitumen sheet bearing a label indicating compliance with ASTM D1970, in addition to other required underlayment. In areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water, the metal valley flashing underlayment shall be solid cemented to the roofing underlayment for slopes under seven units vertical in 12 units horizontal (58-percent slope) or self-adhering polymer-modified bitumen sheet shall be installed.
The installation of metal roof panels shall comply with the provisions of this section.
Metal roof panel roof coverings shall be applied to a solid or closely fitted deck, except where the roof covering is specifically designed to be applied to spaced supports.

Minimum slopes for metal roof panels shall comply with the following:

  1. The minimum slope for lapped, nonsoldered seam metal roof panels without applied lap sealant shall be three units vertical in 12 units horizontal (25-percent slope).
  2. The minimum slope for lapped, nonsoldered seam metal roof panels with applied lap sealant shall be one-half unit vertical in 12 units horizontal (4-percent slope). Lap sealants shall be applied in accordance with the manufacturer's installation instructions.
  3. The minimum slope for standing-seam metal roof panel systems shall be one-quarter unit vertical in 12 units horizontal (2-percent slope).

Metal-sheet roof covering systems that incorporate supporting structural members shall be designed in accordance with Chapter 22. Metal-sheet roof coverings installed over structural decking shall comply with Table 1507.4.3(1). The materials used for metal-sheet roof coverings shall be naturally corrosion resistant or provided with corrosion resistance in accordance with the standards and minimum thicknesses shown in Table 1507.4.3(2).

TABLE 1507.4.3(1)

METAL ROOF COVERINGS

ROOF COVERING
TYPE
STANDARD APPLICATION
RATE/THICKNESS
Aluminum ASTM B209, 0.024 inch minimum thickness
for roll-formed panels and 0.019 inch minimum
thickness for press-formed shingles.
Aluminum-zinc
alloy coated steel
ASTM A792 AZ 50
Cold-rolled copper ASTM B370 minimum 16 oz./sq. ft. and 12
oz./sq. ft. high yield copper for metal-sheet
roof covering systems: 12 oz./sq. ft. for preformed
metal shingle systems.
Copper 16 oz./sq. ft. for metal-sheet roof-covering
systems; 12 oz./sq. ft. for preformed metal
shingle systems.
Galvanized steel ASTM A653 G-90 zinc-coated.a
Prepainted steel ASTM A755
Stainless steel ASTM A240, 300 Series Alloys
Steel ASTM A924
Zinc 0.027 inch minimum thickness; 99.995%
electrolytic high grade zinc with alloy additives
of copper (0.08% - 0.20%), titanium
(0.07% - 0.12%) and aluminum (0.015%).

For SI: 1 ounce per square foot = 0.305 kg/m2,

1 pound per square foot = 4.882 kg/m2,

1 inch = 25.4 mm, 1 pound = 0.454 kg.

  1. For Group U buildings, the minimum coating thickness for ASTM A653 galvanized steel roofing shall be G-60.

TABLE 1507.4.3(2)

MINIMUM CORROSION RESISTANCE

55% Aluminum-zinc alloy coated steel ASTM A792 AZ 50
5% Aluminum alloy-coated steel ASTM A875 GF60
Aluminum-coated steel ASTM A463 T2 65
Galvanized steel ASTM A653 G-90
Prepainted steel ASTM A755a
  1. Paint systems in accordance with ASTM A755 shall be applied over steel products with corrosion-resistant coatings complying with ASTM A463, ASTM A653, ASTM A792 or ASTM A875.

Metal roof panels shall be secured to the supports in accordance with the manufacturer's recommended fasteners. In the absence of manufacturer recommendations, the following fasteners shall be used:

  1. Galvanized fasteners shall be used for steel roofs.
  2. Copper, brass, bronze, copper alloy or 300 series stainless-steel fasteners shall be used for copper roofs.
  3. Stainless-steel fasteners are acceptable for all types of metal roofs.
  4. Aluminum fasteners are acceptable for aluminum roofs attached to aluminum supports.
The installation of metal roof shingles shall comply with the provisions of this section.
Metal roof shingles shall be applied to a solid or closely fitted deck, except where the roof covering is specifically designed to be applied to spaced sheathing.
Metal roof shingles shall not be installed on roof slopes below three units vertical in 12 units horizontal (25-percent slope).

1507.5.4 Ice Barrier

ILLUSTRATION
Where required, ice barriers shall comply with Section 1507.1.2.
Metal roof shingle roof coverings shall comply with Table 1507.4.3(1). The materials used for metal-roof shingle roof coverings shall be naturally corrosion resistant or provided with corrosion resistance in accordance with the standards and minimum thicknesses specified in the standards listed in Table 1507.4.3(2).
Metal roof shingles shall be secured to the roof in accordance with the manufacturer's installation instructions.
Roof valley flashing shall be of corrosion-resistant metal of the same material as the roof covering or shall comply with the standards in Table 1507.4.3(1). The valley flashing shall extend not less than 8 inches (203 mm) from the centerline each way and shall have a splash diverter rib not less than 3/4 inch (19.1 mm) high at the flow line formed as part of the flashing. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). In areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water, the metal valley flashing shall have a 36-inch-wide (914 mm) underlayment directly under it consisting of either one layer of underlayment running the full length of the valley or a self-adhering polymer-modified bitumen sheet bearing a label indicating compliance with ASTM D1970, in addition to underlayment required for metal roof shingles. The metal valley flashing underlayment shall be solidly cemented to the roofing underlayment for roof slopes under seven units vertical in 12 units horizontal (58-percent slope) or self-adhering polymer-modified bitumen sheet shall be installed.
The installation of mineral-surfaced roll roofing shall comply with this section.
Mineral-surfaced roll roofing shall be fastened to solidly sheathed roofs.
Mineral-surfaced roll roofing shall not be applied on roof slopes below one unit vertical in 12 units horizontal (8-percent slope).
Where required, ice barriers shall comply with Section 1507.1.2.
Mineral-surfaced roll roofing shall conform to ASTM D3909 or ASTM D6380.
The installation of slate shingles shall comply with the provisions of this section.
Slate shingles shall be fastened to solidly sheathed roofs.
Slate shingles shall only be used on slopes of four units vertical in 12 units horizontal (4:12) or greater.

1507.7.4 Ice Barrier

ILLUSTRATION
Where required, ice barriers shall comply with Section 1507.1.2.
Slate shingles shall comply with ASTM C406.

Minimum headlap for slate shingles shall be in accordance with Table 1507.7.6. Slate shingles shall be secured to the roof with two fasteners per slate.

TABLE 1507.7.6

SLATE SHINGLE HEADLAP

SLOPE HEADLAP (inches)
4:12 < slope < 8:12 4
8:12 < slope < 20:12 3
slope ≥ 20:12 2

For SI: 1 inch = 25.4 mm.

Flashing and counterflashing shall be made with sheet metal. Valley flashing shall be not less than 15 inches (381 mm) wide. Valley and flashing metal shall be a minimum uncoated thickness of 0.0179-inch (0.455 mm) zinc-coated G90. Chimneys, stucco or brick walls shall have not fewer than two plies of felt for a cap flashing consisting of a 4-inch-wide (102 mm) strip of felt set in plastic cement and extending 1 inch (25 mm) above the first felt and a top coating of plastic cement. The felt shall extend over the base flashing 2 inches (51 mm).

The installation of wood shingles shall comply with the provisions of this section and Table 1507.8.

TABLE 1507.8

WOOD SHINGLE AND SHAKE INSTALLATION

ROOF ITEM WOOD SHINGLES WOOD SHAKES
1. Roof slope Wood shingles shall be installed on slopes of not less than
three units vertical in 12 units horizontal (3:12).
Wood shakes shall be installed on slopes of not less
than four units vertical in 12 units horizontal (4:12).
2. Deck requirement
Temperate climate Shingles shall be applied to roofs with solid or spaced
sheathing. Where spaced sheathing is used, sheathing
boards shall be not less than 1" × 4" nominal dimensions
and shall be spaced on centers equal to the
weather exposure to coincide with the placement of
fasteners.
Shakes shall be applied to roofs with solid or spaced
sheathing. Where spaced sheathing is used, sheathing
boards shall be not less than 1" × 4" nominal dimensions
and shall be spaced on centers equal to the
weather exposure to coincide with the placement of
fasteners. Where 1" × 4" spaced sheathing is installed
at 10 inches, boards must be installed between
the sheathing boards.
In areas where the average
daily temperature in January
is 25°F or less or where
there is a possibility of ice
forming along the eaves
causing a backup of water.
Solid sheathing is required. Solid sheathing is required.
3. Interlayment No requirements. Interlayment shall comply with ASTM D226,
Type 1.
4. Underlayment
Temperate climate Underlayment shall comply with Section 1507.1.1. Underlayment shall comply with Section 1507.1.1.
5. Application
Attachment Fasteners for wood shingles shall be hot-dipped
galvanized or Type 304 stainless steel with a minimum
penetration of 0.75 inch into the sheathing. For
sheathing less than 0.5 inch thick, the fasteners shall
extend through the sheathing.
Fasteners for wood shakes shall be hot-dipped
galvanized or Type 304 with a minimum penetration of
0.75 inch into the sheathing. For sheathing less than
0.5 inch thick, the fasteners shall extend through the
sheathing.
No. of fasteners Two per shingle. Two per shake.
Exposure Weather exposures shall not exceed those set forth in Weather exposures shall not exceed those set forth in
Method Shingles shall be laid with a side lap of not less than
1.5 inches between joints in courses, and no two joints
in any three adjacent courses shall be in direct
alignment. Spacing between shingles shall be 0.25 to
0.375 inch.
Shakes shall be laid with a side lap of not less than 1.5
inches between joints in adjacent courses. Spacing
between shakes shall not be less than 0.375 inch or
more than 0.625 inch for shakes and taper sawn shakes
of naturally durable wood and shall be 0.25 to 0.375
inch for preservative-treated taper sawn shakes.
Flashing In accordance with Section 1507.8.8. In accordance with Section 1507.9.9.

For SI: 1 inch = 25.4 mm, °C = [(°F) - 32]/1.8.

Wood shingles shall be installed on solid or spaced sheathing. Where spaced sheathing is used, sheathing boards shall be not less than 1-inch by 4-inch (25 mm by 102 mm) nominal dimensions and shall be spaced on centers equal to the weather exposure to coincide with the placement of fasteners.
Solid sheathing is required in areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water.
Wood shingles shall be installed on slopes of not less than three units vertical in 12 units horizontal (25-percent slope).
Where required, ice barriers shall comply with Section 1507.1.2.

Wood shingles shall be of naturally durable wood and comply with the requirements of Table 1507.8.5.

TABLE 1507.8.5

WOOD SHINGLE MATERIAL REQUIREMENTS

MATERIAL APPLICABLE
MINIMUM GRADES
GRADING
RULES
Wood shingles of naturally
durable wood
1, 2 or 3 CSSB

CSSB = Cedar Shake and Shingle Bureau.

Fasteners for wood shingles shall be corrosion resistant with a minimum penetration of 3/4 inch (19.1 mm) into the sheathing. For sheathing less than 1/2 inch (12.7 mm) in thickness, the fasteners shall extend through the sheathing. Each shingle shall be attached with not fewer than two fasteners.

Wood shingles shall be laid with a side lap not less than 11/2 inches (38 mm) between joints in adjacent courses, and not be in direct alignment in alternate courses. Spacing between shingles shall be 1/4 to 3/8 inch (6.4 to 9.5 mm). Weather exposure for wood shingles shall not exceed that set in Table 1507.8.7.

TABLE 1507.8.7

WOOD SHINGLE WEATHER EXPOSURE AND ROOF SLOPE

ROOFING MATERIAL LENGTH
(inches)
GRADE EXPOSURE (inches)
3:12 pitch
to < 4:12
4:12 pitch
or steeper
Shingles of naturally
durable wood
16 No. 1
No. 2
No. 3
3.75
3.5
3
5
4
3.5
18 No. 1
No. 2
No. 3
4.25
4
3.5
5.5
4.5
4
24 No. 1
No. 2
No. 3
5.75
5.5
5
7.5
6.5
5.5

For SI: 1 inch = 25.4 mm.

At the juncture of the roof and vertical surfaces, flashing and counterflashing shall be provided in accordance with the manufacturer's installation instructions, and where of metal, shall be not less than 0.019-inch (0.48 mm) (No. 26 galvanized sheet gage) corrosion-resistant metal. The valley flashing shall extend not less than 11 inches (279 mm) from the centerline each way and have a splash diverter rib not less than 1 inch (25 mm) high at the flow line formed as part of the flashing. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). For roof slopes of three units vertical in 12 units horizontal (25-percent slope) and over, the valley flashing shall have a 36-inch-wide (914 mm) underlayment of either one layer of Type I underlayment running the full length of the valley or a self-adhering polymer-modified bitumen sheet bearing a label indicating compliance with ASTM D1970, in addition to other required underlayment. In areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water, the metal valley flashing underlayment shall be solidly cemented to the roofing underlayment for slopes under seven units vertical in 12 units horizontal (58-percent slope) or self-adhering polymer-modified bitumen sheet shall be installed.
Each bundle of shingles shall be identified by a label of an approved agency.
The installation of wood shakes shall comply with the provisions of this section and Table 1507.8.
Wood shakes shall only be used on solid or spaced sheathing. Where spaced sheathing is used, sheathing boards shall be not less than 1-inch by 4-inch (25 mm by 102 mm) nominal dimensions and shall be spaced on centers equal to the weather exposure to coincide with the placement of fasteners. Where 1-inch by 4-inch (25 mm by 102 mm) spaced sheathing is installed at 10 inches (254 mm) on center, additional 1-inch by 4-inch (25 mm by 102 mm) boards shall be installed between the sheathing boards.
Solid sheathing is required in areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water.
Wood shakes shall only be used on slopes of not less than four units vertical in 12 units horizontal (33-percent slope).

1507.9.4 Ice Barrier

ILLUSTRATION
Where required, ice barriers shall comply with Section 1507.1.2.
Interlayment shall comply with ASTM D226, Type I.

Wood shakes shall comply with the requirements of Table 1507.9.6.

TABLE 1507.9.6

WOOD SHAKE MATERIAL REQUIREMENTS

MATERIAL MINIMUM APPLICABLE
GRADING RULES
Wood shakes of naturally
durable wood
1 CSSB
Taper sawn shakes of naturally
durable wood
1 or 2 CSSB
Preservative-treated shakes
and shingles of naturally durable wood
1 CSSB
Fire-retardant-treated shakes and 1 CSSB
Preservative-treated taper sawn
shakes of Southern pine treated in
accordance with AWPA U1
(Commodity Specification A,
Special Requirement 4.6
1 or 2 TFS

CSSB = Cedar Shake and Shingle Bureau.

TFS = Forest Products Laboratory of the Texas Forest Services.

Fasteners for wood shakes shall be corrosion resistant with a minimum penetration of 3/4 inch (19.1 mm) into the sheathing. For sheathing less than 1/2 inch (12.7 mm) in thickness, the fasteners shall extend through the sheathing. Each shake shall be attached with not fewer than two fasteners.

Wood shakes shall be laid with a side lap not less than 11/2 inches (38 mm) between joints in adjacent courses. Spacing between shakes in the same course shall be 3/8 to 5/8 inch (9.5 to 15.9 mm) for shakes and taper sawn shakes of naturally durable wood and shall be 1/4 to 3/8 inch (6.4 to 9.5 mm) for preservative taper sawn shakes. Weather exposure for wood shakes shall not exceed those set in Table 1507.9.8.

TABLE 1507.9.8

WOOD SHAKE WEATHER EXPOSURE AND ROOF SLOPE

ROOFING MATERIAL LENGTH
(inches)
GRADE EXPOSURE (inches)
4:12 PITCH OR STEEPER
Shakes of naturally durable wood 18
24
No. 1
No. 1
7.5
10a
Preservative-treated taper sawn shakes of Southern yellow pine 18
24
No. 1
No. 1
7.5
10
18
24
No. 2
No. 2
5.5
7.5
Taper sawn shakes of naturally durable wood 18
24
No. 1
No. 1
7.5
10
18
24
No. 2
No. 2
5.5
7.5

For SI: 1 inch = 25.4 mm.

  1. For 24-inch by 0.375-inch handsplit shakes, the maximum exposure is 7.5 inches.
At the juncture of the roof and vertical surfaces, flashing and counterflashing shall be provided in accordance with the manufacturer's installation instructions, and where of metal, shall be not less than 0.019-inch (0.48 mm) (No. 26 galvanized sheet gage) corrosion-resistant metal. The valley flashing shall extend not less than 11 inches (279 mm) from the centerline each way and have a splash diverter rib not less than 1 inch (25 mm) high at the flow line formed as part of the flashing. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). For roof slopes of three units vertical in 12 units horizontal (25-percent slope) and over, the valley flashing shall have a 36-inch-wide (914 mm) underlayment of either one layer of Type I underlayment running the full length of the valley or a self-adhering polymer-modified bitumen sheet bearing a label indicating compliance with ASTM D1970, in addition to other required underlayment. In areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water, the metal valley flashing underlayment shall be solidly cemented to the roofing underlayment for slopes under seven units vertical in 12 units horizontal (58-percent slope) or self-adhering polymer-modified bitumen sheet shall be installed.
Each bundle of shakes shall be identified by a label of an approved agency.
The installation of built-up roofs shall comply with the provisions of this section.
Built-up roofs shall have a design slope of not less than one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage, except for coal-tar built-up roofs that shall have a design slope of not less than one-eighth unit vertical in 12 units horizontal (1-percent slope).

Built-up roof covering materials shall comply with the standards in Table 1507.10.2 or UL 55A.

TABLE 1507.10.2

BUILT-UP ROOFING MATERIAL STANDARDS

MATERIAL STANDARD STANDARD
Acrylic coatings used in roofing ASTM D6083
Aggregate surfacing ASTM D1863
Asphalt adhesive used in roofing ASTM D3747
Asphalt cements used in roofing ASTM D2822; D3019;
D4586
Asphalt-coated glass fiber base sheet ASTM D4601
Asphalt coatings used in roofing ASTM D1227; D2823;
D2824; D4479
Asphalt glass felt ASTM D2178
Asphalt primer used in roofing ASTM D41
Asphalt-saturated and asphalt-coated
organic felt base sheet
ASTM D2626
Asphalt-saturated organic felt
(perforated)
ASTM D226
Asphalt used in roofing ASTM D312
Coal-tar cements used in roofing ASTM D4022; D5643
Coal-tar saturated organic felt ASTM D227
Coal-tar pitch used in roofing ASTM D450; Type I or II
Coal-tar primer used in roofing,
dampproofing and waterproofing
ASTM D43
Glass mat, coal tar ASTM D4990
Glass mat, venting type ASTM D4897
Mineral-surfaced inorganic cap sheet ASTM D3909
Thermoplastic fabrics used in roofing ASTM D5665, D5726
The installation of modified bitumen roof covering shall comply with the provisions of this section.
Modified bitumen roof covering shall have a design slope of not less than one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage.
Modified bitumen roof covering materials shall comply with ASTM D6162, ASTM D6163, ASTM D6164, ASTM D6222, ASTM D6223, ASTM D6298 or ASTM D6509.
A base sheet that complies with the requirements of Section 1507.11.2, ASTM D1970 or ASTM D4601 shall be permitted to be used with a modified bitumen cap sheet.
The installation of thermoset single-ply roofing shall comply with the provisions of this section.
Thermoset single-ply membrane roofs shall have a design slope of not less than one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage.

Thermoset single-ply roof coverings shall comply with ASTM D4637.

Ballasted thermoset low-sloped roofs shall be installed in accordance with this section and Section 1504.4. Stone used as ballast shall comply with ASTM D448 or ASTM D7655.
The installation of thermoplastic single-ply roofing shall comply with the provisions of this section.
Thermoplastic single-ply membrane roofs shall have a design slope of not less than one-fourth unit vertical in 12 units horizontal (2-percent slope).
Thermoplastic single-ply roof coverings shall comply with ASTM D4434, ASTM D6754 or ASTM D6878.
Ballasted thermoplastic low-sloped roofs shall be installed in accordance with this section and Section 1504.4. Stone used as ballast shall comply with ASTM D448 or ASTM D7655.
The installation of sprayed polyurethane foam roofing shall comply with the provisions of this section.
Sprayed polyurethane foam roofs shall have a design slope of not less than one-fourth unit vertical in 12 units horizontal (2-percent slope) for drainage.
Spray-applied polyurethane foam insulation shall comply with ASTM C1029 Type III or IV or ASTM D7425.

Foamed-in-place roof insulation shall be installed in accordance with the manufacturer's instructions. A liquid-applied protective coating that complies with Table 1507.14.3 shall be applied not less than 2 hours nor more than 72 hours following the application of the foam.

TABLE 1507.14.3

PROTECTIVE COATING MATERIAL STANDARDS

MATERIAL STANDARD
Acrylic coating ASTM D6083
Silicone coating ASTM D6694
Moisture-cured polyurethane coating ASTM D6947
Foam plastic materials and installation shall comply with Chapter 26.
The installation of cold and hot applied liquid-applied roofing shall comply with the provisions of this section.
Liquid-applied roofing shall have a design slope of not less than one-fourth unit vertical in 12 units horizontal (2-percent slope).
Liquid-applied roofing shall comply with ASTM C836, ASTM C957, ASTM D1227 or ASTM D3468, ASTM D6083, ASTM D6694, ASTM D6947 or other approved material standard.
Vegetative roofs, roof gardens and landscaped roofs shall comply with the requirements of this chapter and Section 1607.13.3.
The structural frame and roof construction supporting the load imposed on the roof by the vegetative roof, roof gardens or landscaped roofs shall comply with the requirements of Table 601.
The installation of photovoltaic shingles shall comply with the provisions of this section.
Photovoltaic shingles shall be applied to a solid or closely fitted deck, except where the shingles are specifically designed to be applied over spaced sheathing.
Where required, ice barriers shall comply with Section 1507.1.2.
Fasteners for photovoltaic shingles shall be galvanized, stainless steel, aluminum or copper roofing nails, minimum 12-gage [0.105 inch (2.67 mm)] shank with a minimum 3/8-inch-diameter (9.5 mm) head, of a length to penetrate through the roofing materials and not less than 3/4 inch (19.1 mm) into the roof sheathing. Where the roof sheathing is less than 3/4 inch (19.1 mm) thick, the nails shall penetrate through the sheathing. Fasteners shall comply with ASTM F1667.
Photovoltaic shingles shall be listed and labeled in accordance with UL 1703.
Photovoltaic shingles shall be attached in accordance with the manufacturer's installation instructions.
Photovoltaic shingles shall be tested in accordance with procedures and acceptance criteria in ASTM D3161. Photovoltaic shingles shall comply with the classification requirements of Table 1504.1.1 for the appropriate maximum nominal design wind speed. Photovoltaic shingle packaging shall bear a label to indicate compliance with the procedures in ASTM D3161 and the required classification from Table 1504.1.1.
The installation of building-integrated photovoltaic (BIPV) roof panels shall comply with the provisions of this section.
BIPV roof panels shall be applied to a solid or closely fitted deck, except where the roof covering is specifically designed to be applied over spaced sheathing.
BIPV roof panels shall not be used on low-sloped roofs.
Underlayment shall comply with ASTM D226, ASTM D4869 or ASTM D6757.
Underlayment shall be applied shingle fashion, parallel to and starting from the eave, lapped 2 inches (51 mm) and fastened sufficiently to hold in place.

Underlayment applied in areas subject to high winds [Vasd greater than 110 mph (49 m/s) as determined in accordance with Section 1609.3.1] shall be applied in accordance with the manufacturer's instructions. Fasteners shall be applied along the overlap at not more than 36 inches (914 mm) on center. Underlayment installed where Vasd is not less than 120 mph (54 m/s) shall comply with ASTM D226, Type III, ASTM D4869, Type IV or ASTM D6757. The underlayment shall be attached in a grid pattern of 12 inches (305 mm) between side laps with a 6-inch (152 mm) spacing at the side laps. The underlayment shall be applied in accordance with Section 1507.1.1 except all laps shall be not less than 4 inches (102 mm). Underlayment shall be attached using cap nails or cap staples. Caps shall be metal or plastic with a nominal head diameter of not less than 1 inch (25.4 mm). Metal caps shall have a thickness of not less than 0.010 inch (0.25 mm). Power-driven metal caps shall have a thickness of not less than 0.010 inch (0.25 mm). Thickness of the outside edge of plastic caps shall be not less than 0.035 inch (0.89 mm). The cap nail shank shall be not less than 0.083 inch (2.11 mm) for ring shank cap nails and 0.091 inch (2.31 mm) for smooth shank cap nails. Staple gage shall be not less than 21 gage [0.0.2 inch (0.81 mm)]. Cap nail shank and cap staple legs shall have a length sufficient to penetrate through-the-roof sheathing or not less than 3/4 inch (19.1 mm) into the roof sheathing.

Exception: As an alternative, adhered underlayment complying with ASTM D1970 shall be permitted.

An ice barrier consisting of not fewer than two layers of underlayment cemented together or of a self-adhering polymer/modified bitumen sheet shall be used instead of normal underlayment and extend from the lowest edges of all roof surfaces to a point not less than 24 inches (610 mm) inside the exterior wall line of the building.

Exception: Detached accessory structures that do not contain conditioned floor area.

BIPV roof panels shall be listed and labeled in accordance with UL 1703.
BIPV roof panels shall be attached in accordance with the manufacturer's installation instructions.
BIPV roof panels shall be tested in accordance with UL 1897. BIPV roof panel packaging shall bear a label to indicate compliance with UL 1897.

14B-15-1508 The provisions of Section 1508 of IBC are adopted by reference with the following modification:

Added Coun. J. 4-10-19, p. 100029.

The use of above-deck thermal insulation shall be permitted provided that such insulation is covered with a roof covering and passes the tests of NFPA 276 or UL 1256 when tested as an assembly.

Exceptions:

  1. Foam plastic insulation shall conform to the material and installation requirements of Chapter 26.
  2. Where a concrete roof deck is used and the above-deck thermal insulation is covered with a roof covering.

Above-deck thermal insulation board shall comply with the standards in Table 1508.2.

[BF] TABLE 1508.2

MATERIAL STANDARDS FOR ROOF INSULATION

Cellular glass board ASTM C552
Composite boards ASTM C1289, Type III, IV,
V or VII
Expanded polystyrene ASTM C578
Extruded polystyrene ASTM C578
Fiber-reinforced gypsum board ASTM C1278
Glass-faced gypsum board ASTM C1177
High-density polyisocyanurate
board
ASTM C1289,
Type II, Class 4
Mineral fiber insulation board ASTM C726
Perlite board ASTM C728
Polyisocyanurate board ASTM C1289, Type I or II
Wood fiberboard ASTM C208, Type II

14B-15-1509 The provisions of Section 1509 of IBC are adopted by reference with the following modifications:

Added Coun. J. 4-10-19, p. 100029.

A radiant barrier installed above a roof deck shall comply with Sections 1509.2 through 1509.4.
Radiant barriers shall be permitted for use above roof decks where the radiant barrier is covered with a roof covering and the system consisting of the radiant barrier and the roof covering complies with the requirements of either FM 4450 or UL 1256.
The low emittance surface of the radiant barrier shall face the continuous airspace between the radiant barrier and the roof covering.
A radiant barrier installed above a roof deck shall comply with ASTM C1313/1313M.

14B-15-1510 The provisions of Section 1510 of IBC are adopted by reference with the following modifications:

Added Coun. J. 4-10-19, p. 100029.

Amended Coun. J. 2-19-20, p. 14474.

The provisions of this section shall govern the construction of unoccupied rooftop structures.

The combined area of parapet walls, unoccupied rooftop structures, rooftop access penthouses in accordance with Section 1510.2 and structures accessory to an occupiable rooftop in accordance with Section 1513.1.1 shall not exceed one-third the area of the supporting roof deck. Such rooftop structures shall not be required to be included in determining building height, number of stories above grade plane or building area in accordance with Chapter 2, nor shall the area of such rooftop structures be included in determining the fire areas specified in Section 901.7.

Exception: If the combined area of rooftop structures exceeds one-third the horizontal area of the supporting roof deck, the height and area of the rooftop structures shall be considered in determining building height, number of stories above grade plane, building area and fire area.

Mechanical penthouses in compliance with Sections 1510.2.1 through 1510.2.5 shall be considered as a portion of the story directly below the roof deck on which such penthouses are located. Other penthouses shall be considered as an additional story of the building.

Mechanical penthouses shall not exceed 18 feet (5486 mm) in height above the roof deck as measured to the average height of the roof of the penthouse.

Exception: On buildings of Type I construction, mechanical penthouses shall be permitted to have a maximum height of 28 feet (8534 mm) above the roof deck.

Mechanical penthouses shall not be used for purposes other than the shelter of mechanical or electrical equipment, tanks, elevators and related machinery, or vertical shaft openings in the roof assembly.
Provisions such as louvers, louver blades or flashing shall be made to protect the mechanical and electrical equipment and the building interior from the elements.

Mechanical penthouses shall be constructed with walls, floors and roofs as required for the type of construction of the building on which such penthouses are built.

Exceptions:

  1. On buildings of Type I and II-A construction, the exterior walls and roof decks of mechanical penthouses with a fire separation distance greater than 5 feet (1524 mm) and less than 20 feet (6096 mm) shall be noncombustible construction and permitted to have not less than a 1-hour fire-resistance rating. The exterior walls and roofs of mechanical penthouses with a fire separation distance of 20 feet (6096 mm) or greater shall be noncombustible construction and not be required to have a fire-resistance rating.
  2. [Reserved]
  3. On buildings of Type III, IV or V construction, the exterior walls of mechanical penthouses with a fire separation distance greater than 5 feet (1524 mm) and less than 20 feet (6096 mm) shall be permitted to have not less than a 1-hour fire-resistance rating or a lesser fire-resistance rating as required by Table 602. On buildings of Type III, IV or VA construction, the exterior walls of mechanical penthouses with a fire separation distance of 20 feet (6096 mm) or greater shall be permitted to be of heavy timber construction complying with Sections 602.4 and 2304.11 or noncombustible construction and shall not be required to have a fire-resistance rating.
Tanks having a capacity of more than 500 gallons (1893 L) located on the roof deck of a building shall be supported on masonry, reinforced concrete, steel or heavy timber construction complying with Section 2304.11 provided that, where such supports are located in the building above the lowest story, the support shall have a fire-resistance rating as required for Type IA construction.
In the bottom or on the side near the bottom of the tank, a pipe or outlet, fitted with a suitable quick-opening valve for discharging the contents into a drain in an emergency shall be provided.
Tanks shall not be placed over or near a stairway or an elevator shaft, unless there is a solid roof or floor underneath the tank.
Unenclosed roof tanks shall have covers sloping toward the perimeter of the tanks.

Cooling towers located on the roof deck of a building and greater than 250 square feet (23.2 m2) in base area or greater than 15 feet (4572 mm) in height above the roof deck, as measured to the highest point on the cooling tower, where the roof is greater than 50 feet (15 240 mm) in height above grade plane shall be constructed of noncombustible materials. The base area of cooling towers shall not exceed one-third the area of the supporting roof deck.

Exception: Drip boards and the enclosing construction shall be permitted to be of wood not less than 1 inch (25 mm) nominal thickness, provided that the wood is covered on the exterior of the tower with noncombustible material.

Towers, spires, minarets, domes, cupolas, and similar features shall be of a type of construction having fire-resistance ratings not less than required for the building on top of which such feature is built. Such features greater than 85 feet (25 908 mm) in height above grade plane as measured to the highest point on such feature, and either greater than 200 square feet (18.6 m2) in horizontal area or used for any purpose other than a belfry or an architectural embellishment, shall be constructed of and supported on Type I or IIA construction.
Features greater than 60 feet (18 288 mm) in height above the highest point at which such feature contacts the roof as measured to the highest point on such feature, or that exceeds 200 square feet (18.6 m2) in area at any horizontal section, or which is intended to be used for any purpose other than a belfry or architectural embellishment, or is located on the top of a building greater than 50 feet (1524 mm) in building height shall be constructed of and supported by noncombustible materials and shall be separated from the building below by construction having a fire-resistance rating of not less than 1.5 hours with openings protected in accordance with Section 711. Such features located on the top of a building greater than 50 feet (15 240 mm) in building height shall be supported by noncombustible construction.
Enclosed features shall have exterior walls constructed as required for the building on top of which such features are built. The roof covering of features shall be not less than the same class of roof covering required for the building on top of which the feature is located.
Mechanical equipment screens shall be constructed of the materials specified for the exterior walls in accordance with the type of construction of the building. Where the fire separation distance is greater than 15 feet (4572 mm), mechanical equipment screens shall not be required to comply with the fire-resistance rating requirements.

Mechanical equipment screens shall not exceed 18 feet (5486 mm) in height above the roof deck, as measured to the highest point on the mechanical equipment screen.

Exception: Where located on buildings of Type I construction, the height of mechanical equipment screens shall not be limited.

Regardless of the requirements in Section 1510.6, mechanical equipment screens that are located on the roof decks of buildings of Type I, II, III or IV construction shall be permitted to be constructed of combustible materials in accordance with the following limitation: the fire separation distance shall be not less than 20 feet (6096 mm) and the height of the mechanical equipment screen above the roof deck shall not exceed 4 feet (1219 mm) as measured to the highest point on the mechanical equipment screen.
The height of mechanical equipment screens located on the roof decks of buildings of Type V construction, as measured from grade plane to the highest point on the mechanical equipment screen, shall not exceed the maximum building height allowed for the building by other provisions of this code.
Rooftop-mounted photovoltaic panels and modules shall be designed in accordance with this section and the Chicago Fire Prevention Code.
Rooftop-mounted photovoltaic panels and modules shall have the fire classification in accordance with Section 1505.9.
Rooftop-mounted photovoltaic panels and modules shall be listed and labeled in accordance with UL 1703 and shall be installed in accordance with the manufacturer's instructions.
Rooftop structures not regulated by Sections 1510.2 through 1510.7 shall comply with Section 1510.8.1.

Aerial supports shall be constructed of noncombustible materials.

Exception: Aerial supports not greater than 12 feet (3658 mm) in height as measured from the roof deck to the highest point on the aerial supports shall be permitted to be constructed of combustible materials.

The structural frame and roof construction supporting loads imposed upon the roof by any rooftop structure shall comply with the requirements of Table 601. The fire-resistance reduction permitted by Table 601, Note a, shall not apply to roofs containing rooftop structures.

14B-15-1511 The provisions of Section 1511 of IBC are not adopted. The following language is adopted as Section 1511:

Added Coun. J. 4-10-19, p. 100029.

Roof repairs and roof replacement shall comply with Section 306 of the Chicago Building Rehabilitation Code.

14B-15-1512 The provisions of Section 1512 of IBC are not adopted.

Added Coun. J. 4-10-19, p. 100029.

14B-15-1513 The following language is adopted as a new Section 1513:

Added Coun. J. 4-10-19, p. 100029.

Amended Coun. J. 2-19-20, p. 14474.

The provisions of this section shall govern the construction of occupiable rooftops and associated rooftop structures.
The combined area of rooftop structures associated with an occupiable rooftop and exceeding 48 inches (1219 mm) in height above the lowest walking surface of the occupiable rooftop shall comply with Section 1510.1.1.
Where the occupied rooftop is located above the highest story, penthouses providing access to or egress from an occupiable rooftop in compliance with Sections 1513.2.1 through 1513.2.5 shall be considered as a portion of the story directly below the roof deck on which such penthouses are located. Other fully-enclosed occupiable space at the roof level shall be considered as an additional story of the building.

Rooftop access penthouses shall not exceed 12 feet (3658 mm) in height above the roof deck as measured to the average height of the roof of the penthouse.

Exception: Where used to enclose elevators that travel to the roof level, rooftop access penthouses shall be permitted to have a maximum height of 20 feet (6096 mm) above the roof deck.

Rooftop access penthouses shall not contain habitable space or any occupiable space other than circulation paths necessary to access means of egress and elevators serving an occupiable rooftop. Rooftop access penthouses shall not contain toilet rooms or bathrooms.
Rooftop access penthouses shall be constructed with walls, floors and roofs as required for the type of construction of the building on which such penthouses are built.
The walking surface and other outdoor elements of an occupiable rooftop shall comply with the requirements of Sections 1513.3.1 through 1513.3.2.

The outdoor elements of occupiable rooftops on buildings not exceeding 55 feet (16.8 m) in building height shall be of noncombustible materials or combustible materials as allowed by Table 1513.3.1 or Table 705.2.1 or 705.2.2 for decks. Outdoor elements not listed in the tables shall conform to the type of construction and fire-resistance rating required for the building to which they are attached.

TABLE 1513.3.1

REQUIRED FIRE SEPARATION DISTANCE FOR OUTDOOR ELEMENTS OF OCCUPIABLE ROOFTOPS ON BUILDINGS UP TO 55 FEET IN BUILDING HEIGHTa

Type of Element Material Type Fire Separation Distance (feet)
0 to less

than 3
3 to less

than 5
5 to less

than 10
10 or

greater
Walking surfaces covering no more than one third of the roof area or 500
square feet, whichever is greater, on side protected by a noncombustible
parapet wall providing a 2-hour fire-resistance rating, at least 36 inches
above the walking surface
U Yes Yes Yes Yes
Walking surfaces on buildings of Group R-5 occupancy covering more
than one third of the roof area, with or without parapet wall
FRTW No Yes Yes Yes
Walking surfaces covering more than one third of the roof area or on side
without a parapet wall
U No No Yes Yes
UNC Yes Yes Yes Yes
Pickets, handrails and similar vertical elements not more than 48 inches in
height above the adjacent walking surface
U No Yes Yes Yes
UNC Yes Yes Yes Yes
Vertical elements of pergolas, trellises, arbors, privacy screens and similar
structures greater than 42 inches in height above the adjacent walking surface,
with 50 percent or more of surface area consisting of regularly distributed
openings
Ub No Yes Yes Yes
UNC Yes Yes Yes Yes
Vertical elements of pergolas, trellises, arbors, privacy screens and similar
structures greater than 42 inches in height above the adjacent walking surface,
solid or with less than 50 percent of surface area consisting of regularly
distributed openings
Ub No No Yes Yes
UNC Yes Yes Yes Yes
Horizontal elements of pergolas, trellises, arbors and similar structures
greater than 42 inches in height above the adjacent walking surface
Ub No Yes Yes Yes
UNC Yes Yes Yes Yes

For SI: 1 foot = 304.8 mm; 1 inch = 25.4 mm; 1 square foot = 0.0929 m2.

U = any material not less fire resistive than untreated wood or plastic composites that comply with ASTM D7032 and Section 2612, unprotected

FRTW = Fire-retardant treated wood

P = any material, protected with construction providing fire-resistance rating as required for exterior wall

HT = heavy timber construction, complying with Section 2304.11

UNC = noncombustible, unprotected

PNC = noncombustible, protected with construction providing fire-resistance rating as required for exterior wall

  1. Where material type U is allowed, material types P, HT, UNC and PNC shall also be allowed; where material type UNC is allowed, material type PNC shall also be allowed.
  2. Combustible pergolas, arbors, trellises, privacy screens and similar structures shall not exceed 12 feet in height above the highest adjacent walking surface.

The outdoor elements of occupiable rooftops on buildings greater than 55 feet (16.8 m) in height shall be of noncombustible materials.

Exceptions:

  1. Pickets, handrails and similar vertical elements not more than 4 feet (1219 mm) in height above the adjacent walking surface of material not less fire resistive than untreated wood or plastic composites that comply with ASTM D7032 and Section 2612 if the fire separation distance is greater than or equal to 20 feet (6096 mm).
  2. Walking surfaces listed as a Class A roof assembly or a Class A roof covering installed over a noncombustible roof assembly.
  3. Limited non-structural elements of material not less fire resistive than untreated wood or plastic composites that comply with ASTM D7032 where approved by the building official.
Structures above an occupiable rooftop that provide weather protection equivalent to a roof and project more than 24 inches (610 mm) horizontally from a wall or other support shall be treated as part of the building to which they are attached for purposes of determining building height and number of stories above grade plane.
Occupiable rooftops shall be provided with means of egress as required in Chapter 10.
Occupiable rooftops shall not be installed on buildings of Type VB construction. The roof assembly below an occupiable rooftop shall have a fire-resistance rating of not less than 1 hour.

14B-15-1514 The following language is adopted as a new Section 1514:

Added Coun. J. 4-10-19, p. 100029

Vegetative roofs, roof gardens and landscaped roofs shall be installed and maintained in accordance with Sections 1505, 1507.16, and 1514.2 through 1514.6.
Vegetative roofs, roof gardens and landscaped roofs that are intended for occupancy shall also comply with Section 1513.
Vegetative roofs, roof gardens and landscaped roofs shall be installed in accordance with ANSI/SPRI VF-1.
Vegetative roof, roof garden or landscaped roof areas shall not exceed 15,625 square feet (1450 m2) for any single area with a maximum dimension of 125 feet (39 m) in length and width. A minimum 6 foot (1.8 m) wide clearance consisting of Class A roof covering shall be provided between adjacent vegetative roof, roof garden or landscaped roof areas.

Vegetative roof, roof garden and landscaped roof areas shall be separated from combustible vertical surfaces, intake and exhaust openings and rooftop equipment by a 6 foot (1.8 m) wide surface consisting of Class A roof covering.

Exception: Separation from plumbing exhaust openings is not required.

Vegetation shall be maintained in accordance with Sections 1514.5.1 through 1514.5.3.
The fire code official is authorized to require a maintenance plan for vegetation placed on roofs.
A water source shall be provided to maintain levels of hydration necessary to keep vegetation alive and to keep dry foliage to a minimum.
Excess biomass, such as overgrown vegetation, leaves and other dead and decaying material shall be removed at regular intervals not less than two times per year.
Fueled equipment used for the care and maintenance of vegetation on roofs shall be stored in accordance with the Chicago Fire Prevention Code.

14B-15-1515 The following language is adopted as a new Section 1515:

Added Coun. J. 4-10-19, p. 100029.

Roof coverings shall comply with the solar reflectance requirements in Section 1515.2.

Exceptions:

  1. Walking surfaces of occupiable rooftops.
  2. Vegetative roofs, roof gardens and landscaped roofs.
  3. Photovoltaic and solar thermal equipment.

All roof coverings shall have a minimum solar reflectance as specified in Sections 1515.2.1 or 1515.2.2 as demonstrated by:

  1. Testing in accordance with ASTM E903 or ASTM E1918.
  2. Testing with a portable reflectometer at near-ambient conditions.
  3. A label from the Cool Roof Rating Council.
  4. Labeled Energy Star-qualified roof product.

Roof coverings on low-sloped roofs shall have an initial reflectance value of 0.72 or a three-year-installed reflectance value of 0.5 or greater.

Exceptions:

  1. Where more than 50 percent of the roof area is a vegetative roof or roof garden, the remainder of the roof area shall have a three-year-installed reflectance value of 0.3 or greater.
  2. Roofs with a minimum of 15 pounds per square foot (0.72 kN/m2) of ballast installed over the entire roof area to resist wind uplift shall have a three-year-installed reflectance value of 0.3 or greater.

Roof coverings on other than low-sloped roofs shall have an initial reflectance value of 0.15 or greater.

Exceptions:

  1. Roof coverings installed with a slope of 5:12 (41 percent) or greater.
  2. Historic buildings.
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