CertainTeed 
CertainTeed’s Siding Products Group (SPG) is the leading manufacturer of vinyl siding and polymer shakes and shingles. It is also a major producer of cellular pvc exterior trim and vinyl fence, railing and deck. SPG products are manufactured in seven plants in the U.S. and sold throughout the U.S and Canada.
4specs Discussion Forum - Great place to ask questions about specifications, products and technical data. Free - no registration required to read or post (subject to moderation).
See also:
06 4520 - Exterior Trim Boards for synthetic trim boards
07 2800 - Rainscreen Drainage Systems
07 4640 - Fiber-Reinforced Cement Siding
07 4660 - Metal Siding
07 4680 - Wood Siding & Shingles
CertainTeed
CertainTeed’s Siding Products Group (SPG) is the leading manufacturer of vinyl siding and polymer shakes and shingles. It is also a major producer of cellular pvc exterior trim and vinyl fence, railing and deck. SPG products are manufactured in seven plants in the U.S. and sold throughout the U.S and Canada.