2 Inch Layer Foam Roof

All these have r values ranging from r 3 2 to r 3 8 per inch.

2 inch layer foam roof.

Contractors often use it to insulate under slabs ceilings walls and roofs. The illustration shows two layers of osb or plywood roof sheathing. Foam board insulation is easy to use and is a great diy way to add some insulation. The r value of closed cell foam is r 6 5 7 per inch.

If you want to install rigid foam above your roof sheathing in climate zone 3 then 1 2 inch of rigid foam board is not ideal this rigid foam layer needs a minimum r value of r 5 and that s impossible with 1 2 inch of foam. Magzo window ac foam seal tape 2 inch wide x 1 2 inch thick open cell adhesive foam tape high resilience foam insulation tape total 6 5 feet 6 5ft x 1 roll 4 7 out of 5 stars 245 13 58 13. More product details close rmax r matte plus 3 1 2 in. Only xps foam to be greenguard gold certified and the first xps foam certified by scientific certification systems scs to contain a minimum of 20 recycled content.

Slate roofing 1 2 inch slates. Slate roofs national slate association 1926. Rmax r matte plus 3 1 2 in. This foam is applied over the top of the membrane that came down from the roof deck catching the wall control layers.

A lower layer conventionally nailed to the rafters and an upper layer installed as a nailing surface for the roofing material on top of the rigid foam. R 7 7 rigid foam insulation. Closed cell spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. R 3 2 polyisocyanurate rigid foam insulation board.

Spray polyurethane foam closed cell per inch of thickness. Note the 2 lb ft3 spray polyurethane foam enhancing the air seal around the extended rafters. Foamular 150 1 in. Standing seam metal 0 032.

Slate roofing 3 4 inch slates. Some types of thicker foam board insulation are available but they may need to be special ordered. R 5 scored square edge rigid foam board insulation sheathing. As my article states you need a minimum of about 1 5 inch of eps 1 inch of xps or 1 inch of polyiso.

R 3 2 polyisocyanurate rigid foam insulation board. In the summers here in phoenix that means that foam does a good job insulating your home and preventing heat from getting into the living spaces of your home. The roofing installation team will then apply a durable outer layer to protect the foam from the elements. Installed on the roof exterior foam makes the living space below more comfortable and reduces the likelihood of ice dams.

Foam is especially good at the following.