Boral Ply 40
High-strength fiberglass
Boral Ply 40 High-strength fiberglass

Boral Ply 40 is an SBS-modified, fiberglass-reinforced underlayment/base sheet for metal, tile, shingle, or shake roofing. According to Boral, Ply 40 is easy to install, and its modified-asphalt composition minimizes wrinkling and buckling. The underlayment offers uncovered exposure time of six months and carries ASTM-D6757, -D4601, -D226, and -D4869 certifications and approvals. Boral Ply 40 is sold in 39 3/8-by-66-inch rolls through distributors; pricing varies regionally. boralroof.com

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