Closed cell spray foam delivers R-6 to R-7 per inch, the highest R-value of any common insulation, and it doubles as a vapor barrier at 2 inches of thickness. For Utah County homes in climate zone 5, that makes it the best choice for rim joists, basement walls, garages, and any space where moisture is a concern. Utah Valley Foam installs closed cell foam across Provo, Orem, and the rest of Utah Valley. Call CALL-TRACKING-NUMBER for a free quote.
What Closed Cell Foam Does
Closed cell foam cures into a dense, rigid material. The cells in the foam are sealed, which is what gives it three properties no other insulation matches in one product:
- R-6 to R-7 per inch. Fiberglass batts run about R-3.2 per inch. In tight framing cavities, closed cell fits double the insulation value into the same space.
- Vapor barrier built in. At 2 inches, closed cell foam qualifies as a class II vapor retarder. No separate plastic sheeting, no gaps.
- Structural rigidity. Closed cell foam bonds to framing and sheathing and measurably stiffens walls and roof decks.
Where We Use It in Utah County Homes
Rim joists are the number one closed cell job in Utah Valley. The rim joist is the band of wood where your floor framing meets the foundation, and in most local homes it is either bare or stuffed with loose fiberglass that does nothing to stop air. Two inches of closed cell foam seals and insulates it permanently. Other common applications: basement walls before finishing, garage ceilings under bedrooms, cantilevered floors, and metal buildings.
Closed Cell Pricing FAQ
How much does closed cell spray foam cost?
Closed cell spray foam typically costs $1.30 to $2.00 per board foot installed. A board foot is one square foot at one inch deep. A typical rim joist job in a Utah County home runs $500 to $1,500 total.
Is closed cell worth the extra cost over open cell?
It depends on the space. Below grade, against concrete, or anywhere moisture is possible, yes, closed cell is the only foam we recommend. In a vented attic where space is not tight, open cell often gives more R-value per dollar.
How thick should closed cell foam be in climate zone 5?
For rim joists and basement walls in Utah County, 2 to 3 inches is standard. That delivers roughly R-13 to R-21 plus the air seal and vapor barrier, which meets or beats code requirements for those assemblies.