Tile shall be applied in accordance with this chapter and the manufacturer's installation instructions, based on the following:
- Climatic conditions.
- Roof slope.
- Underlayment system.
- Type of tile being installed.
Clay and concrete roof tiles shall be fastened in accordance with this section and the manufacturer's installation instructions. Perimeter tiles shall be fastened with not less than one fastener per tile. Tiles with installed weight less than 9 pounds per square foot (0.4 kg/m2) require not less than one fastener per tile regardless of roof slope. Clay and concrete roof tile attachment shall be in accordance with the manufacturer's installation instructions where applied in areas where the ultimate design wind speed exceeds 130 miles per hour (58 m/s) and on buildings where the roof is located more than 40 feet (12 192 mm) above grade. In areas subject to snow, not less than two fasteners per tile are required. In other areas, clay and concrete roof tiles shall be attached in accordance with Table R905.3.7.
|SHEATHING||ROOF SLOPE||NUMBER OF FASTENERS|
|Solid without battens||All||One per tile|
|Spaced or solid with battens and slope < 5:12||Fasteners not required||—|
|Spaced sheathing without battens||5:12 ≤ slope < 12:12||One per tile/ every other row|
|12:12 ≤ slope < 24:12||One per tile|