ASTM D4869-05e1 - Standard Specification for Asphalt-Saturated Organic Felt Underlayment Used in Steep Slope Roofing
ASTM D226-05 - Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing
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G.A.P. ASTM 30 D226 Felt - G.A.P. Roofing, Inc.
Asphalt Saturated Organic Felt Paper – Muller Construction Supply