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For an ongrade concrete sub floor under laminate floor, is foam or felt/fiber underlayment better? - MP Global Products, LLC
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ASTM D6757—07(2013) Standard Specification for Underlayment Felt Containing Inorganic Fibers Used in Steep Slope Roofing (PDF Download)
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ROBERTS Super Felt Underlayment - 100 sq. ft. Roll - 44" x 27.3' x 3 mm - Carpet Underlayments - Amazon.com
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