Review Foam Roof Exterior Insulation

Adding exterior foam on an old roof is a good idea whenever a reroof is planned it is a once in 50 year opportunity to bring the house up to higher level of energy performance.

Review foam roof exterior insulation.

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. Their drawing does not show the use of exterior foam on the roof though a. Froth pak 620 sealant 2 component foam insulation kit a tank b tank 30 hose closed cell quick cure polyurethane expanding spray foam 3 8 out of 5 stars 17 882 85 882. Spray foam insulation also called spray foam or spray polyurethane foam spf is an alternative to traditional building insulation.

It is often used as a layer of continuous insulation on exterior walls and in the roof. Homes insulated with it can be some of the most efficient and comfortable homes built. The previous four options are all used beneath the roof. Installed on the roof exterior foam makes the living space below more comfortable and reduces the likelihood of ice dams.

These 2x4s are extended at the eaves and rakes to create a roof overhang. Then 2x4s usually installed on the flat are installed above the rigid foam. This spray foam insulation kit will help fill any cavities cracks along with expansion joints for insulation and air sealing. Due to spray foam insulation being such an upcoming method of insulation there have been quite a few misconceptions about the effectiveness and dangers of its use.

The illustration shows two layers of osb or plywood roof sheathing. Because old roofs were often framed with 2x6s there isn t much room for insulation. Spray foam insulation is a great product. The most common problems that occur around the use of icynene is the belief that it can have a negative effect on the roof of the loft.

Rigid foam insulation packs a lot of r value into a relatively thin package. I ve been in plenty of these homes and can tell you that when spray foam is installed properly they outperform 99 of fiberglass batt insulated stick built homes. Rigid foam board is just above the roof deck or an exterior insulation option. It helps stop energy loss and can insulate stud wall cavities up to two inches thick.

The persist approach shown in that article includes rigid foam above the roof sheathing. I can also tell you that 73 of all statistics are made up on the spot so please don t ask for. The spray kit comes with up to 650 feet of foam and comes with a gun dispenser and hose assembly wrench petroleum jelly packet and operation instruction manual. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels.

Causing the timbers to rot.