Using Styrofoam For Attic Roof Insulation

It provides an r value of 6 per inch of thickness and often comes foil faced to help reflect radiant heat.

Using styrofoam for attic roof insulation. You can use a foamboard adhesive to glue it in place. Polyiso comes in several thicknesses and is used over house sheathing underneath siding or in attic spaces where its reflective properties are very effective. If you plan on finishing your attic then you cannot install it directly. As we have discussed previously spray foam insulation can effectively seal roofs and other spaces where condensation is more likely such as an attic.

As with attic floor insulation moisture and heat removal are the reasons for creating proper air. 2 measure and cut the foam boards as. 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. Baffles establish a channel for air to circulate between the insulation and the roof sheathing.

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. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. Using spray foam insulation in an unvented attic application both low density open cell and medium density closed cell spray foam can be used in an unvented attic to provide the needed thermal resistance and airtightness. That means even a 2 thick piece will only give you r 10 for 0 96 sq.

The styrofoam insulation that home depot carries is only rated for r 5 per inch. Use furring strips nailed into the sides of the rafters so that you have something to fasten the board to. This is an even more dense and more expensive foam board insulation. Do not nail the board into the roof.

Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. 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. Foam board insulation in the attic can cut down on energy costs and simultaneously promote a more environmentally sound way of daily living. I used 20 bags which is the minimum purchase for a free 24 hour blower rental at both hd and lowes.

Installing foam insulation boards in the attic is no that hard and can save you money compared with professional installation. One common use of extruded polystyrene foam board is for foundation insulation panels. Your board must leave at least inch gap between the board and the roof.