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GAP Roofing 18 inch Split felt #30 GMC18Split - The Home Depot
Tar paper - Wikipedia
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G.A.P. ASTM 30 D226 Felt - G.A.P. Roofing, Inc.
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Mastering Roof Inspections: Underlayment, Part 2 - InterNACHI®
30 Asphalt Saturated Underlayment | atlasroofing.com
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Bright White Paper - 18 x 12 in 80 lb Text Felt | Via Felt Paper 3-07-397-P
When is No. 30 Asphalt Felt Not No. 30 Asphalt Felt?
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