CSLB C-39 Roofing ContractorSteep-Slope RoofingMedium
A roofer is installing a new clay tile roof system on a residential property. The tiles have a nominal length of 16 inches. To ensure adequate weather protection and allow for thermal movement, what is the typical minimum side lap required for standard interlocking clay roofing tiles?
- A1 inch
- B3 inches
- C2 inches
- D4 inches
Show answer & explanationAnswer & explanation
Correct answer: A. 1 inch
For standard interlocking clay roofing tiles, a minimum side lap of 1 inch is typically required. This overlap ensures that water is effectively channeled away from the roof deck while allowing for minor expansion and contraction.
Why the other options are wrong
- B. 3 inches of side lap would be excessive for interlocking clay tiles, leading to reduced coverage per tile and increased material cost.
- C. 2 inches of side lap is generally more than required for standard interlocking tiles and might be seen in extreme weather conditions or with specific tile designs.
- D. 4 inches is far too much side lap for interlocking clay tiles and is not a standard requirement.
Clay Tile Side Lap
Side lap is the horizontal overlap of one tile over an adjacent tile in the same course, ensuring a watertight seam.
- Prevents water penetration between adjacent tiles.
- Crucial for weather resistance.
- Typically 1 inch for standard interlocking clay tiles.
Memory trick: Side lap's narrow, but keeps the rain out.