How To Install Foam Board Insulation On Roof

There are at least two good reasons why this approach makes more sense than installing the insulation under the roof sheathing.

How to install foam board insulation on roof. Insulated roof assemblies can be vented or unvented. Keep foam board insulation away from direct sunlight prior to installation. Cover the insulation with a vapor barrier before you install it. 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.

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. Insulation board should be added between the old and new roof systems to ensure proper insulation and to reflect heat from the outside. All foam boards absorb water vapor. 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.

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. When installing the foam use caulk or tape for maximum insulation between the material and the board or floor. 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. Over the foam you will need something to nail the roofing to usually a solid sheet of plywood or osb.

It will degrade its r value. Available in both foam and rigid form choose the board type. More insulation on the exterior is good. Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets.