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What spray foam insulation is, where it belongs, and where it doesn’t. Straight answers from a contractor that installs both foam and cellulose — so we have no reason to sell you one over the other.
Spray foam does two jobs at once: it insulates and it air seals. That combination makes it genuinely hard to beat in specific places — rim joists and sill plates, irregular cavities that batts can’t fill, cathedral and roof-deck assemblies, and anywhere you need an air barrier and thermal barrier in the same step.
It is not, however, the automatic answer for every attic. An open attic floor in an older home is usually better and more affordably served by air sealing plus blown cellulose. Anyone who recommends foam everywhere is selling a product, not solving a building.
Closed-cell foam delivers more R-value per inch and adds structural rigidity and moisture resistance; open-cell is lighter, more affordable, and expands further into irregular spaces. Which one belongs in your assembly depends on the cavity depth, the moisture conditions, and what the space is doing. See the role of R-value and how air sealing works alongside it.
We don’t quote foam off a phone call. A home energy assessment tells us what the house is actually doing, which is the only way to know whether foam is worth its premium in your case.
BPI Accredited · NYSERDA Participating Contractor · Woman Owned · Family Run. Serving Westchester County, the Lower Hudson Valley, and northern New Jersey since 2005 — see our spray foam services or call (845) 445-8255.
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