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TRI-BUILT G 30 POUND FELT ASTM 4869 36 INCH X 72 FEET 216 SQUARE FEET
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TRI-BUILT No.30 is underlayment is applied over the roofing deck before installation of asphalt shingles. This product is highly recommended as an underlayment for architectural shingles and is not recommended for 20 year 3 tab shingles.