Crafted from premium Douglas Fir and Canadian softwood species, Tolko T-PLY Sheathing has the strength, quality and versatility needed for all structural panel requirements. T-PLY Sheathing is ideal for roof and wall construction, in both new construction and renovation. Made from sustainably managed forests in British Columbia and with no added urea formaldehyde (NAUF) T-PLY products are CARB compliant and APA Certified to CSA 0121 and CSA 0151 as well as PS1-09.