2 Inch Layer Foam Roof

R 3 2 polyisocyanurate rigid foam insulation board.

2 inch layer foam roof.

Installed on the roof exterior foam makes the living space below more comfortable and reduces the likelihood of ice dams. 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. 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.

R 3 2 polyisocyanurate rigid foam insulation board. 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. Spray polyurethane foam closed cell per inch of thickness. R 7 7 rigid foam insulation.

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. Contractors often use it to insulate under slabs ceilings walls and roofs. 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. The roofing installation team will then apply a durable outer layer to protect the foam from the elements.

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. Some types of thicker foam board insulation are available but they may need to be special ordered. 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.

More product details close rmax r matte plus 3 1 2 in. Slate roofing 3 4 inch slates. The illustration shows two layers of osb or plywood roof sheathing. 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.

The r value of closed cell foam is r 6 5 7 per inch. Slate roofing 1 2 inch slates. Foam is especially good at the following. All these have r values ranging from r 3 2 to r 3 8 per inch.

R 5 scored square edge rigid foam board insulation sheathing. 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. Rmax r matte plus 3 1 2 in. Slate roofs national slate association 1926.

Standing seam metal 0 032.