Spray Foam Insulation in Evansville, IN

Spray foam insulation in Evansville earns its cost where heat and air leak fastest: rim joists, basement and crawl space walls, kneewalls, cathedral ceilings and steel buildings. It sprays on as a liquid, expands into every gap and cures in place, so one layer insulates and seals. In a city that sees both 90F summer days and January lows well below freezing, that air seal matters in both seasons. Two foams do two different jobs.

Closed cell vs open cell

Closed-cell foam cures hard and dense. HomeGuide rates it at R-5 to R-7 per inch; at normal thickness it slows vapor and does not absorb water, and it stiffens the surface it bonds to. Open-cell foam cures soft and expands more, rated R-3.5 to R-3.7 per inch. It seals air and dampens sound well but lets vapor through, so in a cold-winter climate it usually needs a vapor retarder on the warm side or an assembly that can dry.

In the Tri-State that sends closed-cell to the cold, damp, tight spots: rim joists, basement and crawl space walls, roof decks without room for vent channels, and pole barn steel. Open-cell fits interior walls, above-grade cavities and some attic rooflines where the moisture plan is handled.

Code targets

The Insulation Institute's summary of the 2020 Indiana Residential Code lists Climate Zone 4 targets of R-38 for ceilings, R-15 for wood-frame walls, and R-13 cavity or R-10 continuous for basement and crawl space walls. In a 2x4 wall, closed-cell reaches R-15 or more in about three inches. On a basement wall, a couple of inches of closed-cell meets the continuous target. We write the planned thickness and R-value on the quote.

Where foam goes in an Evansville house

The rim joist is the most common foam job here. It runs around the whole house on top of the foundation, is usually bare wood or loosely stuffed fiberglass, and lets cold air into the basement or crawl space all winter. Two to three inches of closed-cell seals it in one pass.

Above that, we foam kneewalls and the short attic floors behind them in story-and-a-half houses, floors over garages, cantilevers, and attic bypasses before loose fill goes on top. In older homes with balloon framing, wall cavities often run open from the basement to the attic and act as chimneys for warm air; foam is the practical way to block them at the top and bottom.

Where foam is not the answer

Foam does not fix leaks. Roof, plumbing or foundation water gets fixed first. Foam should not cover knob-and-tube wiring or vermiculite that may contain asbestos until those are checked. And on a wide, open attic floor, blown-in insulation usually reaches R-49 or R-60 for less. We say so when that is the case.

Prep, temperature and cure

We cover floors and belongings, mask what needs it, and set up ventilation. Foam and the surface need to be within a working temperature range, so for unheated spaces in winter we add heat or schedule a milder day. HomeGuide advises staying out for at least 24 hours while foam cures. Cured foam does not settle, so the thickness we install stays.

Tell us which spaces you are thinking about and what you have noticed. We will look, explain where foam pays, and send a written price. Get a free estimate