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The installation of clay and concrete tile shall comply with the provisions of this section.
1507.3.1 Deck Requirements
Concrete and clay tile shall be installed only over solid sheathing.
Exception: Spaced lumber sheathing shall be permitted in seismic design categories A, B and C.
1507.3.2 Deck Slope
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 1507.1.1.
1507.3.3 Underlayment
Unless otherwise noted, required underlayment shall conform to: ASTM D226, Type II; ASTM D2626 or ASTM D6380, Class M mineral-surfaced roll roofing.
1507.3.4 Clay Tile
Clay roof tile shall comply with ASTM C1167.
1507.3.5 Concrete Tile
Concrete roof tile shall comply with ASTM C1492.
1507.3.6 Fasteners
Tile fasteners shall be corrosion resistant and not less than 11-gage, [0.120 inch (3 mm)], 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.
1507.3.7 Attachment
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 inches 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.
1507.3.8 Application
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
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.

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1507.3.7 Roof Assemblies and Rooftop Structures, Attachment
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 ...