Built-Up & Single-Ply Roofing Manufacturers:

Carlisle Syntec
Firestone Building Products
Johns Manville
GenFlex
Duro-Last
FiberTite
Soprema

Metal Roofing, Shingle & Slate Roofing Manufacturers:

ATAS International
Englert
Firestone Metal Products
Pac-Clad
Merchant & Evans
CertainTeed (SELECT ShingleMaster)
GAF
Vermont Structural Slate