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0090 Built up Roofing Membrane Four Ply - Flat Roofing - Built up Roofing - Image Text: Downward slope of roof > hot asphalt > roofing felts (36 inches wide) > flood coat of asphalt > 36 inches > gravel > exposure = 9 inches > Note: for 3 ply-exposure = 12 inches > for 2 ply-exposure = 18 inches > base layer of felt (dry laid) with minimum 2 inch overlap at edges > roof sheathing |
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