Using Styrofoam For Attic Roof Insulation

Use furring strips nailed into the sides of the rafters so that you have something to fasten the board to.

Using styrofoam for attic roof insulation.

Polyiso comes in several thicknesses and is used over house sheathing underneath siding or in attic spaces where its reflective properties are very effective. For the same reason insulation shouldn t touch the roof s underside. Baffles establish a channel for air to circulate between the insulation and the roof sheathing. It provides an r value of 6 per inch of thickness and often comes foil faced to help reflect radiant heat.

If you plan on finishing your attic then you cannot install it directly. The superattic system creates a continuous air and insulation barrier directly beneath the attic roof with no thermal bridging to compromise energy performance. As we have discussed previously spray foam insulation can effectively seal roofs and other spaces where condensation is more likely such as an attic. The superattic system utilizes proprietary silverglo rigid foam insulation panels to fully seal and insulate the attic directly beneath the roof rafters and directly inside the gable ends.

Foam board insulation in the attic can cut down on energy costs and simultaneously promote a more environmentally sound way of daily living. I just insulated my attic this weekend with blown in cellulose insulation and achieved between r 30 to r 45 for about 0 42 sq. This is an even more dense and more expensive foam board insulation. That means even a 2 thick piece will only give you r 10 for 0 96 sq.

Your board must leave at least inch gap between the board and the roof. One common use of extruded polystyrene foam board is for foundation insulation panels. Select rigid foam insulation boards that are at least 1 2 inch less in thickness than the rafter space is deep if you plan to finish the attic as living space. Installing foam insulation boards in the attic is no that hard and can save you money compared with professional installation.

The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. 2 measure and cut the foam boards as. The styrofoam insulation that home depot carries is only rated for r 5 per inch. These insulation materials are not only used to insulate home to bar air from coming in and out but to also protect the space from elements such as mold rodents moisture and dust.

Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. You can use a foamboard adhesive to glue it in place. Do not nail the board into the roof.