Which slope is required for asphalt strip shingles?

Which slope is required for asphalt strip shingles?

• A. 2:8
• B. 3:12
• C. 1:12
• D. 2:12

Answer: (D)

Minimum slope for asphalt strip shingles is 2 inches of rise for every 12 inches of run. This 2:12 distance keeps water from pooling under the shingles and gives enough run for the shingles to shed water and seal properly when heated by sun. If the roof is shallower than 2:12, water can infiltrate before the adhesive seals, leading to leaks unless additional underlayment or a different roofing system is used. Slopes steeper than 2:12 are acceptable, but the required minimum is 2:12, which is why that option is the correct choice.

Minimum slope for asphalt strip shingles is 2 inches of rise for every 12 inches of run. This 2:12 distance keeps water from pooling under the shingles and gives enough run for the shingles to shed water and seal properly when heated by sun. If the roof is shallower than 2:12, water can infiltrate before the adhesive seals, leading to leaks unless additional underlayment or a different roofing system is used. Slopes steeper than 2:12 are acceptable, but the required minimum is 2:12, which is why that option is the correct choice.