Rigid Foam Insulation Roof Application

This section outlines the conditions for unvented attic roof assemblies.

Rigid foam insulation roof application.

Scroll below if you d like to view an infographic comparing the three types if insulation. Insulated roof assemblies can be vented or unvented. Nail it around the edges with roofing nails. Xps is a recyclable insulation that s mostly used in walls and below grade applications.

Note that table r806 4 indicates the amount of insulation above the roof deck or air impermeable insulation below the roof deck required for condensation control assuming minimum required total insulation as indicated in section n1102 building thermal envelope. This is the most easily recognized type of rigid foam insulation thanks to its popular blue green or pink color. For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings. 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.

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. As far as cost and r value goes xps is the middle option of the three.