Rigid Foam Insulation Roof Application

Insulated roof assemblies can be vented or unvented.

Rigid foam insulation roof application.

Start at the bottom of the roof and place the first piece of rigid foam insulation against the metal flashing starting at the center line. Scroll below if you d like to view an infographic comparing the three types if insulation. This is the most easily recognized type of rigid foam insulation thanks to its popular blue green or pink color. There are at least two good reasons why this approach makes more sense than installing the insulation under the roof sheathing.

Nail it around the edges with roofing nails. As far as cost and r value goes xps is the middle option of the three. Xps is a recyclable insulation that s mostly used in walls and below grade applications. As the most used insulation type for roofing applications polyiso is a closed cell foam that is created by heating chemicals and synthetic materials into a composite material that cools into rigid foam panels.

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. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings.