Foam board is made from polyisocyanurate, polystyrene, or polyurethane and usually offers the highest level of insulation among products that can be DIY-installed. It is thinner than material that ...

Elevate's RESISTA is a high-performance polyisocyanurate (PIR) insulation board laminated on both sides to a gas-tight, multi-layered aluminum-kraft facer (AK) or mineral-coated glass fiber facer ...