How To Install Foam Board Insulation On Roof

Available in both foam and rigid form choose the board type.

How to install foam board insulation on roof.

Insulated roof assemblies can be vented or unvented. Insulation board should be added between the old and new roof systems to ensure proper insulation and to reflect heat from the outside. The snugness of the foam itself should be sufficient to hold the strips. To save a step i would recommend using a nailbase panel foam preadhered to osb or sometimes plywood on one side only see photo facing page.

When installing the foam use caulk or tape for maximum insulation between the material and the board or floor. More insulation on the exterior is good. It will degrade its r value. Keep foam board insulation away from direct sunlight prior to installation.

It will help you to eliminate problems that may come when the house becomes extremely cold in the winter and terribly hot in the summer. Cover the insulation with a vapor barrier before you install it. All foam boards absorb water vapor. There are lots of different ways to insulate this type of roof but one of the best methods calls for the installation of rigid foam insulation above the roof sheathing.

Now that you know your options there are just a few more tips that you might need before you get started with installing your rigid foam insulation. Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets. Polyurethane spray foam metal roof insulation in order to add moisture barrier under metal roof you can spray the undersides of the roof by using a thick layer of polyurethane spray foam. Position the foam board between the rafters and push it upward until it fits snugly against the underside of the roof deck.