Which of the following roof types is generally NOT used on slopes of less than 2 inches per foot?

Rationale

Asphalt shingle is generally NOT used on slopes of less than 2 inches per foot.

Asphalt shingles are designed for steeper slopes to ensure proper water drainage and minimize the risk of leakage. On slopes less than 2 inches per foot, other roofing materials are preferred as they are better suited for low-slope applications.

A (Asphalt shingle.) CORRECT

Asphalt shingles are traditionally used on roofs with steeper slopes, typically greater than 2 inches per foot. Their design relies on gravity to shed water effectively, making them unsuitable for lower slopes where water may pool, increasing the risk of leaks and damage.

B (Asphalt roll roofing material.) YOUR ANSWER

Asphalt roll roofing is specifically designed for low-slope applications and can be successfully used on roofs with slopes of less than 2 inches per foot. Its installation method and material properties allow for effective waterproofing, making it a common choice for such roofs.

C (PVC-type membrane.) YOUR ANSWER

PVC-type membrane roofing is also suitable for low-slope roofs, including those with slopes less than 2 inches per foot. This material provides excellent waterproofing capabilities and is designed to withstand the conditions typically found on low-sloped roofs.

D (Asphalt or coal tar.) YOUR ANSWER

Asphalt or coal tar roofing products can be effectively used on low-slope applications, including those with slopes below 2 inches per foot. These materials are known for their durability and water resistance, making them appropriate for a variety of roof types.

Conclusion

In summary, asphalt shingles are not suitable for roofs with slopes of less than 2 inches per foot, as their design relies on steeper inclines for effective water drainage. In contrast, options like asphalt roll roofing, PVC membranes, and asphalt or coal tar products are specifically engineered for low-slope applications, ensuring adequate waterproofing and protection against leaks.

Which of the following roof types is generally NOT used on slopes of less than 2 inches per foot?

Asphalt shingle is generally NOT used on slopes of less than 2 inches per foot.

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