What is the minimum lap distance on ridge shingles?

What is the minimum lap distance on ridge shingles?

• A. 100 mm
• B. 150 mm
• C. 200 mm
• D. 250 mm

Answer: (B)

Ridge cap shingles must overlap the shingles beneath them enough to shed water and resist wind uplift. The minimum lap distance ensures the cap covers the joints and creates a weather-tight seal at the ridge. If the lap is smaller, water can wick under and wind can lift the cap, leading to leaks. A larger lap is acceptable but adds waste and weight without improving protection. Therefore, the standard minimum distance for ridge shingles is one hundred fifty millimetres.

Ridge cap shingles must overlap the shingles beneath them enough to shed water and resist wind uplift. The minimum lap distance ensures the cap covers the joints and creates a weather-tight seal at the ridge. If the lap is smaller, water can wick under and wind can lift the cap, leading to leaks. A larger lap is acceptable but adds waste and weight without improving protection. Therefore, the standard minimum distance for ridge shingles is one hundred fifty millimetres.