Spray Foam Insulation in Overland Park, KS

Spray foam insulation goes on as a liquid, expands to fill every crack and cures in place. That lets one layer do two jobs: stop air and slow heat. In Overland Park, where summers push past 100F some years and winter lows reach well below zero on record, the air seal matters as much as the R-value. We use foam where those two jobs count most: rim joists, basement walls, kneewalls, vaulted ceilings, rooms over garages and roof decks.

Closed cell vs open cell

Closed-cell foam is dense and rigid. HomeGuide lists it at R-5 to R-7 per inch, and at normal thickness it slows vapor and does not soak up water. It suits below-grade walls, rim joists and tight roof bays. Open-cell foam is soft and expands a lot, at R-3.5 to R-3.7 per inch. It seals air and dampens sound, and it is often used to insulate the underside of a roof deck when an attic is being brought inside the conditioned space, or in walls during a remodel. Because vapor can pass through it, we pay attention to the moisture plan wherever we use it.

Sealed attics

In some Johnson County homes, the furnace, air handler and ducts sit in the attic. One option is to move the insulation from the attic floor to the roofline with spray foam, so the equipment and ducts sit inside a semi-conditioned space instead of a hot attic. That changes ventilation, moisture and safety details, so it is a design decision, not a default. We explain when it makes sense and when sealing the attic floor and adding blown-in is the better value.

Rim joists and basements

Nearly every house with a basement here has a rim joist, the band of framing sitting on the foundation. It is often bare wood or stuffed with fiberglass, and it leaks air around the whole house. Two to three inches of closed-cell foam seals and insulates it in one step. If you are finishing the basement, this is the time.

Bonus rooms and cantilevers

The room over the garage in many 1990s and 2000s homes is hot in summer and cold in winter. Its floor sits over an unheated garage, and its kneewalls and sloped ceilings border attic space. Foam in the floor framing and on the kneewalls, plus sealing where the walls meet the attic, usually fixes it.

When foam is not the answer

Foam does not fix leaks, and it should not go over wet wood, live knob-and-tube wiring or untested vermiculite. On a wide-open attic floor, blown-in insulation over sealed gaps usually costs less per R-value. We tell you which parts of your house are worth foaming.

Curing

We cover and mask the work area and ventilate it. HomeGuide advises staying out for 24 hours or more while foam cures. Once cured, foam keeps its shape and thickness. Get a free estimate