Topical Terminology > Base Ply
1 Definition
Base Ply
For Base Ply we have a term and definition in Roofing.
Base Ply (Roofing) 
An asphalt-saturated and/or coated felt installed as the first ply with 4 inch laps in a built-up roof system under the following felts which can be installed in a shingle-like fashion.
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