Exterior Contractor Product Guide

Thermax

Thermax Sheathing (polyisocyanurate)insulation, from Dow Chemical Co., is an easy-to-install, non-structural, rigid board insulation consisting of glass fiber-reinforced foam core laminated between pinhole-free aluminum foil facers. Thermax's composition improves fire resistance and dimensional stability and has a R-value of 6.5 per in.