Powerdeck F from Recticel Insulation is a closed cell, rigid PIR foam insulation board for use on warm flat roofs under built-up felt, mastic asphalt and approved single-ply membrane waterproof ...

This wall insulation system consists of four simple panels made from 1-inch-thick rigid insulation board. Your local fire codes may require rigid foam insulation to be covered with 1/2-inch gypsum.