2 Inch Layer Foam Roof

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.

2 inch layer foam roof.

Foam board insulation is easy to use and is a great diy way to add some insulation. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches. Foam is especially good at the following. 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.

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. One of the keys to over roofing is to tie the air control layer of the roof assembly to the air control layer of the wall assembly. Some types of thicker foam board insulation are available but they may need to be special ordered. R 3 2 polyisocyanurate rigid foam insulation board.

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. The roofing installation team will then apply a durable outer layer to protect the foam from the elements. Spray polyurethane foam closed cell per inch of thickness. Standing seam metal 0 032.

Slate roofs national slate association 1926. Foamular 150 1 in. The r value of closed cell foam is r 6 5 7 per inch. R 5 scored square edge rigid foam board insulation sheathing.

The illustration shows two layers of osb or plywood roof 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. Slate roofs national slate association 1926. Note the 2 lb ft3 spray polyurethane foam enhancing the air seal around the extended rafters.

More product details close rmax r matte plus 3 1 2 in. R 3 2 polyisocyanurate rigid foam insulation board. 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. Installed on the roof exterior foam makes the living space below more comfortable and reduces the likelihood of ice dams.

Contractors often use it to insulate under slabs ceilings walls and roofs. R 7 7 rigid foam insulation. Slate roofing 3 4 inch slates. 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.

Slate roofing 1 2 inch slates.