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The insulation extends down the roofline to the rim joists and soffit areas as well as on gable wall ends.
Spray foam insulation between floor joists. Rigid foam is the best insulation for rim joists. We chose 2 in thick r 10 extruded polystyrene don t use expanded polystyrene which is a less effective air and moisture barrier. This keeps it from deteriorating or falling. Only spray polyurethane foam can be used for this application as batt insulation will end up sagging and blown insulation simply can t adhere to the roof decking.
As long as your cured spray foam is no thicker than 3 1 4 in the international residential code irc allows spray foam at the rim joist area to be left exposed without any protective drywall. Move in a steady stroke around the joist. Spray foam not only insulates but air seals the floor as well. The relevant provisions can be found in section r314 5 11 of the 2006 irc and in section r316 5 11 of the 2009 irc.
You can insulate second floor rim joists following the same steps shown here if you happen to tear out a ceiling during remodeling. If your home sits on a vented unconditioned crawl space or basement your home is wasting a lot of energy. When properly applied to a thickness of one inch or more spray foam insulation is an effective air barrier preventing air leakage that creates drafty conditions and. Closed cell spf is an effective thermal air moisture and vapor barrier.
The r value of fiberglass batting is 2 8 3 9. The r value of spray foam insulation is double that of fiberglass batting. Clean product from the dispenser with a cloth and apply petroleum jelly one. Spray foam insulation expands as it is applied filling every gap around joints plumbing wiring ducts and fixtures.
Closed cell spray polyurethane foam spf is an excellent choice for insulating attics and rim joists. The life expectancy of spray foam insulation is 80 years. Hold the insta flow dispenser at least 6 inches from the spray area and pull the trigger when ready. Push down on the ejector to remove the nozzle once spraying is complete.
It also conforms to the exact space it s in.
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