The Inter-Ply Felts illustrated in (Figure I - green dot) are bound together
as a single layer of asphalt and porous felt. This is a manufacturing process
where the felts are interwoven during installation to create the roof Membrane
(Figure II).
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The implementation of
ISO Standards (
International Organization for Standardization ) are rare in
roofing because the industry is dominated by much smaller companies where
such management techniques are less known. Instead, roofers tend to use
Generally Accepted Roofing Practices (GARP).
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