
Roofing Manufacturers:
GAF Materials Corp
Johns Manville
Firestone
Carlisle
Tamko Building Products
Soprema
Owens Corning
Sarnafil
mcelroymetals
Fabral
Petersen Aluminum
IMETCO
AEP Span
ER Systems
Organizations:
Copper.org
ASTM International
Underwriters Laboratories
RCI
FM Global
National Roofing Contractors Association
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