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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 ...
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 ...
Flash and batt is a hybrid insulation approach combining fiberglass insulation and closed-cell spray foam. Fiberglass devoured the insulation industry in the 1970s, for obvious reasons. It is cheap, simple to install (if not easy to install well), and readily available. Any weekend warrior with a stapler and utility knife can install the stuff.
Spray foam is really a waste in stud walls due to the thermal bridging of the studs. This is especially true for closed cell spray foam, but also applies to open cell spray foam to a lesser extent. I would recommend mineral wool over spray foam. Keep in mind too that I’m one of the bigger proponents of spray foam on this site, and I’m still ...
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.
We are reading lots of things about spray foam insulation, and have just had the attic space in our new home spray foamed with a closed cell variety. We are contemplating fiberglass batting in the rest of the house after reading that the offgasses from this spray foam installation can cause respiratory irritation, even after the initial 72 hours, particularly for those already suffering with ...
20-year old house has uninsulated basement (both a crawl space and a concrete part) and attic. There is insulation in the ceiling of the basement of the type that you roll out, as well as the floor of the attic. The insulation has been ruined by rodents. It seemed that replacing the ruined insulation with 3" of closed cell foam that would be clean and rodent-resistant would be an easy choice ...
The amount of closed cell spray foam or rigid insulation is somewhere between 20% to 50% of the R value of the overall cavity insulation depending on your climate zone. This percentage is the "bit of closed cell" that is worth it. Open cell foam is still vapour permeable, there is a risk of condensation, thus you need to vent.