Rigid Foam Insulation Roof Application

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

Rigid foam insulation roof application.

This is the most easily recognized type of rigid foam insulation thanks to its popular blue green or pink color. 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. 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 at least two good reasons why this approach makes more sense than installing the insulation under the roof sheathing.

This section outlines the conditions for unvented attic roof assemblies. Scroll below if you d like to view an infographic comparing the three types if insulation. Falls in the middle of the three types of rigid foam insulation in both cost and r value used most in walls or below grade applications recyclable and at about r 5 per inch costs around 42 per sq. As far as cost and r value goes xps is the middle option of the three.

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. Nail it around the edges with roofing nails.