REQUIREMENTS FOR ROOF COVERINGS

TABLE 1507.3.7 CLAY AND CONCRETE TILE ATTACHMENT GENERAL - CLAY OR CONCRETE ROOF TILE Maximum Allowable Stress Mean roof Design Wind Speed, Vasdf height Roof slope < 3:12 Roof slope 3:12 and over (mph) (feet) 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 spaced/solid sheathing with battens or spaced sheathing) Maximum Allowable Stress Mean roof Design Wind Speed, Roof slope Roof slope Vasdf height Roof slope < 5:12 5:12 < 12:12 12:12 and over (mph) (feet) 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 Mean roof Design Wind Speed, Vasdf height All roof slopes (mph) (feet) 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. a. 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. b. Snow areas. Not fewer than two fasteners per tile are required or battens and one fastener. c. Roof slopes greater than 24:12. The nose of all tiles shall be securely fastened. d. 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. e. 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. f. Vasd shall be determined in accordance with Section 1609.3.1. 1507.12.2 Material standards. Thermoset single-ply roof coverings shall comply with ASTM D4637 or ASTM D5019. Minimum thickness shall be 60 mils reinforced membrane over a 1/4" minimum thickness dense coverboard. 1507.13.2 Material standards. Thermoplastic single-ply roof coverings shall comply with ASTM D4434, ASTM D6754 or ASTM D6878. Minimum thickness shall be 60 mils reinforced membrane over a 1/4" minimum thickness dense coverboard. 124 1507.15.1 Slope. Liquid-applied roofing shall have a design slope of not less than one-fourth unit vertical in 12 units horizontal (2-percent slope). Liquid acrylic coatings shall have a onehalf unit vertical in 12 units horizontal (4-percent slope). CHAPTER 16 - STRUCTURAL DESIGN