Transcription of Shingle Underlaymentpp 1-7 - …
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Shingle Underlaymentpp 1-7 - …
Shingle Underlayment WHEN UNDERLAYMENT IS REQUIRED. UNDERLAYMENT SPECIFICATIONS The installation of standard underlayment beneath shingles is required by many Shingle manufacturers. Generally, CertainTeed WATER RESISTANT UNDERLAYMENT recommends that underlayment be installed but does not require it except as noted below. Two common grades of water resistant Shingle underlayment are available; #15, also known as standard Shingle underlayment, and LOW SLOPE: All roof shingles applied to a low slope deck (2" to 4". #30, also known as heavy duty Shingle underlayment. However, per foot) require the use of CertainTeed WinterGuard Waterproofing within those grades there are many choices. For example, among Shingle Underlayment, or its equivalent,* applied over the entire standard Shingle underlayment (#15), the following can be found: deck surface. Consult the WinterGuard and individual Shingle application instructions for details. UNRATED Shingle UNDERLAYMENT.
materials begin to dry, absorb more moisture, lose its strength and eventually begin to tear. The less asphalt used to saturate the under-layment sheet during manufacturing, the …
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