Along Saylorville Lake

Spray Foam Insulation in Johnston, IA

From 222 residents in 1970 to more than 24,000, almost all of it built recently.

Free on-site estimates across the metro
Written quote listing material, depth and R-value for each area
Air leaks, damp spots and old wiring checked before anything is covered

A Town Built Almost All at Once

Spray foam insulation in Johnston is shaped by how fast the city grew. Wikipedia lists 222 residents in 1970, the year after Johnston incorporated, and 24,064 in 2020. The population roughly doubled between 2000 and 2010 alone. Point2Homes puts the median year built at 2004, with 33% of homes built from 2000 to 2009 and 26.8% from 2010 to 2019. Fewer than 1.5% of homes predate 1950.

What builders often skip

Newer Johnston homes usually meet the code of the day in the attic, but some spots get less attention: the rim joist in an unfinished basement, the ceiling of an attached garage under a bedroom, and attic gaps around lights and bath fans. Those are where we start. Closed-cell foam on the rim and garage ceiling, plus attic sealing, is a common Johnston job.

Walkouts near the lake

Johnston includes part of Saylorville Reservoir. Where a lot slopes toward the lake or a ravine, a walkout basement means a full-height exposed wall that loses more heat than a buried one. Foam on the walkout wall and rim makes the finished space more even.

Camp Dodge and corporate campuses

Camp Dodge sits in Johnston, as does the Pioneer (now Corteva) headquarters. We focus on homes, garages and shops, not large commercial buildings.

Owners and renters

About 70.8% of Johnston's 9,259 occupied homes are owner-occupied.

A typical Johnston job

In a 2005 house with a walkout lower level, we would spray closed-cell on the rim all around, foam the exposed walkout wall and the buried walls before framing, and seal and top up the attic. If the garage has a room above, its ceiling gets foam too. Most of these jobs take one to two days.

Costs

HomeGuide's national figure for spray foam is $1.50 to $5.00 per square foot installed, with closed-cell at $3.00 to $5.00. A walkout wall adds area, so it gets its own line on the quote. The price on our written estimate is the one you pay.

Summer humidity

Johnston's summers are humid, like the rest of central Iowa. In a basement, that humid air meets cool concrete. Foam bonded to the wall keeps it from condensing behind the drywall, which is why we do not put fiberglass against concrete. Get a free estimate

What to Know in Johnston

Growth. 222 residents in 1970 and 24,064 in 2020; the city incorporated in 1969 (Wikipedia).
Housing age. Median year built 2004; 33% of homes built 2000-2009 and 26.8% in 2010-2019 (Census figures via Point2Homes).
Landscape. Part of Saylorville Reservoir lies in Johnston, and Camp Dodge is located there (Wikipedia).
Climate zone. Polk County is in Climate Zone 5A, where Iowa's code table lists R-49 for ceilings.

Our Services in Johnston, IA

Johnston Questions

Is a walkout basement harder to insulate?

The exposed wall loses more heat, so it gets more attention, but the work is the same: foam on the rim and walls before framing.

My house is from 2008. What would you check?

The rim joist, garage ceiling, attic penetrations and the attic hatch are the usual weak spots in homes from that era.

Do you work on shops on Johnston acreages?

Yes. Closed-cell foam on steel stops condensation and holds heat.

Why not fiberglass on basement walls?

Humid air can reach the cold concrete behind it and condense. Foam bonded to the wall prevents that.

Free Estimates in Johnston, IA

Johnston homeowners: ask for a free estimate.

Call (515) 992-7853 Free Estimate