Spray Foam Insulation in Overland Park, KS

Spray foam insulation in Overland Park has to handle two seasons that pull in opposite directions. Wikipedia's climate data for the city shows average July highs around 89F and January lows around 20F, with records of 114F and -22F. Hot, humid summers push heat down through the attic, and cold, dry winters pull it out through every gap. We seal those gaps and insulate attics, basements, walls and bonus rooms with closed-cell or open-cell spray foam where it fits, and blown-in insulation where it does the job for less.

Overland Park houses, by decade

Overland Park incorporated in 1960 with 28,085 people and grew into the second-largest city in Kansas, with 197,238 residents in 2020. Census estimates compiled by Point2Homes show the building boom: 17.4% of homes built in the 1980s, 19.6% in the 1990s and 13.5% in the 2000s, plus 12.5% from the 1960s in the older north end. Each era has its typical weak spots. Mid-century ranches have thin attics and bare rim joists. Split-levels and two-stories from the 1970s and 1980s add cantilevers and kneewalls. Large 1990s and 2000s homes often have bonus rooms over the garage, vaulted ceilings, and long runs of ductwork in a hot attic.

Climate zone and code

OpenEI lists Johnson County in Climate Zone 4A, the mixed-humid zone. Kansas has no statewide residential energy code; the U.S. Department of Energy lists the state as home rule, so each city adopts its own. Across State Line, Kansas City, Missouri adopted the 2021 IECC in 2023 and then, on February 5, 2026, its council voted 7-6 to roll back parts of it for new homes, according to KCUR. For existing homes, the Department of Energy recommends R-60 for an uninsulated Zone 4 attic, or adding R-49 where 3 to 4 inches are already in place. Most attics we see here are well short of that.

The attic does double duty

In a Kansas City summer, the attic over a typical house gets far hotter than the outdoor air, and that is often where the furnace, air handler or ductwork sits. Leaky ducts and thin insulation mean you pay to cool air that then picks up heat on its way to the rooms. Sealing the attic floor, insulating to depth, and sealing accessible duct connections are some of the best-value things you can do. In winter, the same sealing keeps warm air in and stops the drafts.

Closed cell vs open cell

Open-cell foam is soft and light, about R-3.5 to R-3.7 per inch per HomeGuide. It expands to fill cavities and seals air well, and it is often used in rooflines and interior walls. Closed-cell foam is rigid and dense, about R-5 to R-7 per inch, and at normal thickness it slows water vapor and does not absorb water. Here, closed-cell is our usual choice for rim joists, basement walls and tight roof bays; open-cell often works for a sealed attic roofline or walls in a remodel. On a wide-open attic floor, sealing the gaps and blowing loose fill is usually cheaper per R-value.

Spray foam insulation contractors: questions to ask

When you get quotes from spray foam insulation contractors or insulation companies in Overland Park, ask each one the same things. What will they seal before they insulate? Which material goes where, at what thickness or depth and R-value? How will they handle attic ventilation and the ductwork? How long should the household stay out while foam cures (HomeGuide suggests 24 hours or more)? A clear answer in writing is a good sign. Ours come area by area so bids line up.

Spray foam insulation cost

HomeGuide's 2026 guide lists installed spray foam at $1.50 to $5.00 per square foot, with open-cell at $1.50 to $3.50 and closed-cell at $3.00 to $5.00. Fixr puts spray foam in existing walls at $3.15 to $7.50 per square foot. A typical rim joist foam job runs about $2,000 to $2,500 and an average attic insulation job $1,000 to $2,700, per HomeGuide. Large Johnson County homes with bonus rooms and vaulted ceilings tend to have more area to cover. We measure, and the written estimate is the price.

Evergy rebates in Kansas

If Evergy is your electric company in Kansas, its 2025 Kansas residential insulation chart lists air sealing at $0.04 per square foot up to $300, R-38 ceiling insulation at $0.15 per square foot up to $500, and $50 for insulating at least 50 linear feet of rim or band joist, for measures installed on or after June 1, 2024, through the program term ending December 31, 2027. Check Evergy's current rules before you schedule and keep the invoice. Get a free estimate

We work in Overland Park and northeast Johnson County: Leawood, Prairie Village, Lenexa, Shawnee, Merriam, Mission and Roeland Park. We also cross State Line into Kansas City, Missouri, Grandview, Raytown and Lee's Summit, and work in Kansas City, Kansas. The inner-ring suburbs hold the most 1950s and 1960s ranches with thin attics and bare rims. Southern Overland Park, Leawood and Lenexa have more large 1980s to 2000s homes with bonus rooms and long duct runs. Kansas City proper adds older, pre-war houses. Each city page covers what is different there.