DIY Frequently Asked Questions / Rigid Insulation')">
Can be used on the interior or exterior of the house, or on basement walls.
Usually comes in board form in a variety of sizes ranging from 8” squares to 4’ x 12’ sheets.
Some types are made of fiberboard and are popular because of their durability and low cost. Fiberboard repels water, while the asphalt coating eliminates the need for building paper.
Another type is made of extruded polystyrene. It is very resistant to moisture and is most highly recommended for below-ground use.
Molded polystyrene board is another type that dissipates water well.
Another type is polyisocyanurate sheathing that is available with aluminum foil or glass fiber mat facers. This type has the highest R-value per inch of thickness of all insulation products.
DIY Frequently Asked Questions / Rigid Insulation')">
Can be used on the interior or exterior of the house, or on basement walls.