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// CODE SNIPPET

R905.1 Roof Covering Application

Residential Code 2018 of Kansas > 9 Roof Assemblies > R905 Requirements for Roof Coverings > R905.1 Roof Covering Application
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Roof coverings shall be applied in accordance with the applicable provisions of this section and the manufacturer's installation instructions. Unless otherwise specified in this section, roof coverings shall be installed to resist the component and cladding loads specified in Table R301.2(2), adjusted for height and exposure in accordance with Table R301.2(3).

R905.1.1 Underlayment

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 to the standard designation and, if applicable, type classification indicated in Table R905.1.1(1). Underlayment shall be applied in accordance with Table R905.1.1(2). Underlayment shall be attached in accordance with Table R905.1.1(3).
Exceptions:
  1. As an alternative, self-adhering polymer-modified bitumen underlayment complying with ASTM D1970 installed in accordance with both the underlayment manufacturer's and roof covering manufacturer's 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, 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 maximum ultimate design wind speeds, Vult, less than 140 miles per hour shall be applied over the entire roof 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 III or Type IV shall be permitted to be installed as follows in 3.1—3.4:
    1. Apply a 19-inch-wide (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). End laps shall be 4 inches (102 mm) and shall be offset by 6 feet (1829 mm).
    2. 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.
    3. Underlayment shall be attached using metal or plastic cap nails with a nominal cap diameter of not less than 1 inch (25 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 (0.25 mm). Minimum thickness of the outside edge of plastic caps shall be 0.035 inch (0.89 mm).
    4. 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. Cap nail shank shall have a length sufficient to penetrate through the roof sheathing or not less than 3/4 inch (19 mm) into the roof sheathing.
TABLE R905.1.1(1)
UNDERLAYMENT TYPES
ROOF COVERINGSECTIONMAXIMUM ULTIMATE DESIGN
WIND SPEED, Vult < 140 MPH
MAXIMUM ULTIMATE DESIGN
WIND SPEED, Vult ≥ 140 MPH
Asphalt shinglesR905.2ASTM D226 Type I
ASTM D4869 Type I, II, III or IV
ASTM D6757
ASTM D226 Type II
ASTM D4869 Type III or Type IV
ASTM D6757
Clay and concrete tileR905.3ASTM D226 Type II
ASTM D2626 Type I
ASTM D6380 Class M mineral-
surfaced roll roofing
ASTM D226 Type II
ASTM D2626 Type I
ASTM D6380 Class M mineral-
surfaced roll roofing
Metal roof shinglesR905.4ASTM D226 Type I or II
ASTM D4869 Type I, II, III or IV
ASTM D226 Type II
ASTM D4869 Type III or Type IV
Mineral-surfaced roll roofingR905.5ASTM D226 Type I or II
ASTM D4869 Type I, II, III or IV
ASTM D226 Type II
ASTM D4869 Type III or Type IV
Slate and slate-type shinglesR905.6ASTM D226 Type I
ASTM D4869 Type I, II, III or IV
ASTM D226 Type II
ASTM D4869 Type III or Type IV
Wood shinglesR905.7ASTM D226 Type I or II
ASTM D4869 Type I, II, III or IV
ASTM D226 Type II
ASTM D4869 Type III or Type IV
Wood shakesR905.8ASTM D226 Type I or II
ASTM D4869 Type I, II, III or IV
ASTM D226 Type II
ASTM D4869 Type III or Type IV
Metal panelsR905.10Manufacturer's instructionsASTM D226 Type II
ASTM D4869 Type III or Type IV
Photovoltaic shinglesR905.16ASTM D4869 Type I, II, III or IV
ASTM D6757
ASTM D4869 Type III or Type IV
ASTM D6757
For SI: 1 mile per hour = 0.447 m/s.


TABLE R905.1.1(2)
UNDERLAYMENT APPLICATION
ROOF COVERINGSECTIONMAXIMUM ULTIMATE DESIGN
WIND SPEED, Vult < 140 MPH
MAXIMUM ULTIMATE DESIGN
WIND SPEED, Vult ≥ 140 MPH
Asphalt shinglesR905.2For 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 in the following
manner: 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. 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 roof slopes of four units vertical in 12 units horizontal
(4:12) or greater, underlayment shall be one layer applied in
the following manner: 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.
Same as Maximum Ultimate Design Wind Speed, Vult < 140 mph except all laps shall be not less than 4 inches.
Clay and
concrete tile
R905.3For 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, apply a 19-inch strip
of underlayment parallel with the eave. Starting at
the eave, apply 36-inch-wide strips of underlayment
felt, 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
not fewer than one layer of underlayment felt
applied shingle fashion, parallel to and starting
from the eaves and lapped 2 inches. End laps shall
be 4 inches and shall be offset by 6 feet.
Same as Maximum Ultimate Design Wind Speed, Vult < 140 mph, except all laps shall be not less than 4 inches.
Metal roof shinglesR905.4Apply in accordance with the manufacturer's installation instructions.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 in the following manner: 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.
For roof slopes of four units vertical in 12 units
horizontal (4:12) or greater, underlayment shall be
one layer applied in the following manner: underlayment
shall be applied shingle fashion, parallel
to and starting from the eave and lapped 4 inches.
End laps shall be 4 inches and shall be offset by 6 feet.
Mineral-surfaced roll roofingR905.5
Slate and slate-type shinglesR905.6
Wood shinglesR905.7
Wood shakesR905.8
Metal panelsR905.10
Photovoltaic shinglesR905.16For 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 in the following manner: 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. 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 roof slopes of four units vertical in 12 units horizontal (4:12) or greater, underlayment shall be one layer applied in the following manner: 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.
Same as Maximum Ultimate Design Wind Speed, Vult < 140 mph, except all laps shall be not less than 4 inches.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s.


TABLE R905.1.1(3)
UNDERLAYMENT APPLICATION
ROOF COVERINGSECTIONMAXIMUM ULTIMATE DESIGN
WIND SPEED, Vult < 140 MPH
MAXIMUM ULTIMATE DESIGN
WIND SPEED, Vult ≥ 140 MPH
Asphalt shinglesR905.2Fastened sufficiently to hold in place
The underlayment shall be attached with corrosion-resistant
fasteners in a grid pattern of 12 inches between side laps with
a 6-inch spacing at side and end laps.
Underlayment shall be attached using metal or plastic cap
nails or cap staples with a nominal cap diameter of not less
than 1 inch. Metal caps shall have a thickness of not less than
32-gage sheet metal. Power-driven metal caps shall have a
minimum thickness of 0.010 inch. Minimum thickness of the
outside edge of plastic caps shall be 0.035 inch. The cap nail
shank shall be not less than 0.083 inch for ring shank cap nails
and 0.091 inch for smooth shank cap nails. Staples shall be
not less than 21 gage. 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 into the roof sheathing.
Clay and concrete tileR905.3
PhotovoltaicR905.16
Metal roof shinglesR905.4Manufacturer's installation instructions.
The underlayment shall be attached with corrosion-resistant
fasteners in a grid pattern of 12 inches between side laps with
a 6-inch spacing at side and end laps.
Underlayment shall be attached using metal or plastic cap
nails or cap staples with a nominal cap diameter of not less
than 1 inch. Metal caps shall have a thickness of not less than
32-gage sheet metal. Power-driven metal caps shall have a
minimum thickness of 0.010 inch. Minimum thickness of the
outside edge of plastic caps shall be 0.035 inch. The cap nail
shank shall be not less than 0.083 inch for ring shank cap nails
and 0.091 inch for smooth shank cap nails. Staples shall be
not less than 21 gage. 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 into the roof sheathing.
Mineral-surfaced roll roofingR905.5
Slate and slate-type shinglesR905.6
Wood shinglesR905.7
Wood shakesR905.8
Metal panelsR905.10
For SI: 1 inch = 25.4 mm, 1 mile per hour = 0.447 m/s.

R905.1.2 Ice Barriers

ILLUSTRATION
In areas where there has been a history of ice forming along the eaves causing a backup of water as designated in Table R301.2(1), 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 fewer 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. On roofs with slope equal to or greater than eight units vertical in 12 units horizontal (67-percent slope), the ice barrier shall also be applied not less than 36 inches (914 mm) measured along the roof slope from the eave edge of the building.
Exception: Detached accessory structures not containing conditioned floor area.

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