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 ...

The first problem is the challenge of adding effective insulation within ... wood rafters and roof boards inside. This is where insulating from the top, both for floors and roofs, can help.