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Two spray foam experts explain their preferences. Different density, different price. Open-cell foam (left) has a density of about 1/2 pound per cubic foot. By volume, it is significantly less expensive than closed-cell foam (right), which has a density of about 2 pounds per cubic foot. Everyone agrees that spray polyurethane foam does a great ...
Open- or closed-cell spray foam insulation is a great way to get air sealing and insulation in a single step, but the health implications are fuzzy. Spray foam is a great air seal and insulator, but the jury is still out on the health effects of possible fumes. Spray-foam insulation has become a weapon of choice for many builders and homeowners ...
A closed-cell spray foam with lower greenhouse gas emissions than conventional formulations has been named best green product of the year at the International Builders' Show. [Image credit: Green Solutions Insulation / CC BY-SA] A spray polyurethane foam using a next-generation blowing agent that lowers the foam’s greenhouse gas emissions has ...
I was told by the foam company (that does both kinds) that open cell spray foam does not have these stringent requirements because it is more fire resistant. Martin Holladay | Oct 18, 2012 10:32am | #4. Moya, Talk to your local code official. In most cases, a spray foam company has to provide documentation from the ICC Evaluation Service if it ...
Closed-cell polyurethane spray foam is amazing stuff. It’s a great insulator, with a higher R-value per inch than almost any other commonly available material. (Polyisocyanurate foam can be equivalent, but it varies with product and temperature.) When installed at least an inch or two thick, it essentially blocks water vapor and air movement.
The project took two days to install and seal the sub-slab insulation. There are 2 in. of XPS foam under the slab and footings, 2 in. covering the slab edge—cast in place during the concrete pour—and 4 ft. of 2-in. XPS used as a wing for the perimeter foundation insulation. (See the IRC Table R403.3 (1) for local requirements).
Closed-cell spray foam provides a higher R-value per inch (6.5) than less expensive insulation types like cellulose and fiberglass (3.5 to 3.7). Most spray polyurethane foam is called “two-component” foam. Two ingredients—conventionally called “A” and “B” components—are mixed on site using special equipment mounted in a trailer ...
By simple averages and 24" rafter spacing, 8" of closed cell spray foam and 2x10 rafters you get about R33 for the assembly, about R32 with 16" rafter spacing. The thermal bridging does make a big difference in the performance of the overall assembly. No, escaping heat is energy loss, but it won't damage your roof.
An energy-recovery ventilator (right) and a duct distribution box (center) in a spray foam insulated home. Contractors who install spray polyurethane foam insulation put themselves at risk if they do so in homes without a plan for mechanical ventilation. Most installations of spray foam insulation, when properly installed, act as an air barrier.
Flash and batt insulation is a method of insulating standard stud walls by augmenting fiberglass batts with 2 inches of closed-cell spray foam applied to the interior of the building sheathing. The standard framing includes 2×6 vertical studs spaced 16 inches on center, drywall interior finish, OSB or plywood exterior sheathing, Tyvek or a ...