CertainTeed Shingle Applicator’s Manual Shingle …

38 YOUR OBJECTIVE: To learn the differences between the various underlayments available. To learn when a particular type of underlayment is the best choice for a particular situation, and to learn how to correctly install the different types of are two major types of Shingle underlayment: water-resistant and waterproof. Within these types are many variations both between brands and within brands. sUNDERLAYMENT SPECIFICATIONStWATER RESISTANT UNDERLAYMENTTwo common grades of water resistant Shingle underlayment are available; #15, also known as standard Shingle underlayment, and #30, also known as heavy duty Shingle underlayment. However, within those grades there are many choices. For example, among standard Shingle underlayment (#15), the following can be found:u UNRATED Shingle UNDERLAYMENT.

CertainTeed Shingle Applicator’s Manual Shingle Underlayments 5. ... Presidential ® TL Shake shingles). Because water drains slowly from these slopes, there is a greater chance of water back-up and damage from ice-dams. The applica-tion instructions for each CertainTeed roofing product indicate the

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