Putting 1 Foil Faced Ridig Board Under Attic Roof

Foam insulation boards are the best material with which to work when undertaking a do it yourself project because foam.

Putting 1 foil faced ridig board under attic roof.

Cut ap foil faced foam sheathing to fit snuggly between the rafters. 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. Foil insulation underlayment is recommended under a metal roof and in most cases the shiny side should be facing up but there s a catch. 2 measure and cut the foam boards as.

4 of polyiso under 4 of eps all above the original roof sheathing. The r value of the insulation must meet local building code requirements for unvented attics to prevent condensation. Installing rigid foam insulation. There s two ways you can go about with foam board insulation.

If you want to use them without creating a vapor barrier look for permeable iso panels faced with fiberglass. We live in zone 5 suburb of chicago and are hopefully about to put rigid foam above the roof sheathing on just the northeast roof portion of our roof. However foil faced iso panels are warranted as impermeable. Install ap foil faced foam boards between rafters directly against the bottom of the roof sheathing.

Installing foam insulation boards in the attic is no that hard and can save you money compared with professional installation. Then a second layer of plywood sheathing and asphalt shingles following the steps explained in this article.