Rigid board insulation for use with heavyweight shingles, standing seam metal, tile, slate and single ply roofing systems.

FlintBoard® ISO NB Composite Polyisocyanurate/OSB Roof Insulation features a closed-cell polyiso core bonded to either 7/16" or 5/8" OSB with a fiber-reinforced felt facer on the bottom side.

FlintBoard ISO NB is a recommended roof insulation in conjunction with CertainTeed Roofing Systems.