CSLB C-39 Roofing ContractorSteep-Slope RoofingMedium
A roofing crew is installing clay roofing tiles on a residential property. The roof has a pitch of 5:12. According to standard practice for tile roofs, what is the recommended minimum headlap for these tiles to ensure proper water shedding and weather resistance?
- A3 inches
- B2 inches
- C4 inches
- D5 inches
Show answer & explanationAnswer & explanation
Correct answer: A. 3 inches
For roof slopes between 4:12 and 5:12, the minimum headlap for tile roofs is typically 3 inches. This ensures adequate overlap for water shedding and protection against wind-driven rain.
Why the other options are wrong
- B. 2 inches is generally too little headlap for a 5:12 slope and could lead to water penetration.
- C. 4 inches is typically required for slopes below 4:12, indicating a greater overlap is needed for lower pitches.
- D. 5 inches would be excessive for a 5:12 slope and is usually reserved for very low pitches or specific tile designs.
Tile Roof Headlap
Headlap is the shortest distance between the butt of an overlapping tile and the upper edge of the tile two courses below it, ensuring proper water diversion.
- Headlap varies with roof pitch and tile type.
- Greater headlap is required for lower roof pitches.
- Typical headlap ranges from 3 to 4 inches for standard slopes.
Memory trick: Headlap's hug: the lower the roof, the tighter the snug.