Transcription of CertainTeed Shingle Applicator’s Manual Shingle …
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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.
3) one layer of mineral-surfaced roll roofing; 4) two layers of 36" (915 mm) wide felt shingle underlayment. 5) in areas not prone to snow or ice, a synthetic water-resistant underlay-ment lapped at 20" and extending through the valley by at least 36". (Coated roll roofing should meet ASTM D224; shingle underlayment
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