HAAG Certified Reviewer

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Which type of composition shingles valley is not recommended by NRCA?

closed
open
woven
cut

The correct answer is: woven

The National Roofing Contractors Association (NRCA) does not recommend the woven type of composition shingles valley for several reasons. Woven valleys can create complications during installation and may lead to issues with water drainage. When shingles are woven together, they can form a less effective channel for directing water away from the roof, which is crucial in preventing leaks and water damage. Additionally, woven valleys may be more prone to wear and tear over time due to the overlapping shingles, which can create additional stress points where the shingles may lift or separate, compromising the overall integrity of the roofing system. This could increase maintenance needs and potentially shorten the lifespan of the roofing material. On the other hand, options like open or closed valleys are typically preferred because they allow for better water runoff and can be more easily maintained and inspected. The cut valley method is also favored as it creates a cleaner appearance and allows for better performance in directing water away from vulnerable areas.