Home of the Arsenal and the Rock Island Line
Spray Foam Insulation in Rock Island, IL
Many homes over 80 years old, and attics and rims that show it.
- Free on-site estimates
- Written quote with foam type, thickness and R-value per area
- Leaks, wiring and damp spots flagged before anything gets covered
Older Houses Near the Confluence
Spray Foam Insulation in Rock Island deals with some of the oldest housing in the Quad Cities. Point2Homes data shows about 32.6% of homes were built in 1939 or earlier and another 15.9% in the 1950s. The city had 37,108 residents and 17,085 housing units at the 2020 census.
History you can see
The Chicago, Rock Island and Pacific Railroad was founded here in 1851, and the Rock Island Arsenal was established in 1862. The Broadway Historic District preserves a cluster of late 19th- and early 20th-century buildings. Houses from that period often have high ceilings, big attics, plaster walls and stone or brick foundations. They leak heat through open chases, around chimneys and along the rim above the foundation.
Working on historic houses
In older houses we are careful about what we cover. Foam does not go over knob-and-tube wiring that is still in use, or over vermiculite that has not been tested. Plaster walls can be dense-packed with cellulose through small holes, which are then patched. The attic floor usually gets sealed with foam and caulk and topped with blown-in insulation.
Flood protection
Rock Island's flood wall, built in 1970, is higher than Davenport's 1919 wall, and it protected downtown in the 2019 flood, according to Wikipedia. Even so, some basements here have taken on water over the years. We check for moisture before insulating any below-grade wall.
A typical job here
In a two-story near the Broadway district, we would often seal the attic floor, block open chases, add blown-in insulation to depth, foam the rim joist and dense-pack any empty walls. In a 1950s ranch, the attic and rim are usually enough to make a big difference. Each area is listed on the quote with material, depth and price, so you can choose what to do now.
Rentals and vacant houses
With 11.2% of housing units vacant at the 2020 census, Rock Island has houses changing hands and being fixed up. If you are renovating a house that has sat empty, the attic and basement are worth checking before new drywall and finishes go in. Old insulation may be damp, nested in or missing, and it is easier to replace while the house is empty.
Code on the Illinois side
Rock Island County is in Climate Zone 5A, and the Illinois Energy Conservation Code, now based on the 2024 IECC as amended, governs new work. We quote to those targets. Get a free estimate
What to Know in Rock Island
- Housing age. About 32.6% of Rock Island homes were built in 1939 or earlier and 15.9% in the 1950s (Point2Homes, ACS data).
- Housing units. The 2020 census counted 17,085 housing units in Rock Island, 11.2% of them vacant.
- Flood wall. Rock Island's flood wall dates from 1970 and protected downtown in 2019; Davenport's older wall dates from 1919.
- Railroad and Arsenal. The Rock Island Line was founded here in 1851, and the Rock Island Arsenal was established in 1862.

Rock Island Questions
Can you insulate a house with plaster walls?
Yes. We dense-pack cellulose through small holes and patch them. We check wiring first.
Is it safe to foam an old stone foundation?
Closed-cell foam can go on dry stone or brick, but we check for moisture first, since old foundations often let some water through.
What about vermiculite in the attic?
Leave it alone and have it tested. If it contains asbestos, it needs a licensed abatement contractor.
I am renovating a vacant Rock Island house. When should I insulate?
Before new drywall goes up. Open walls and an empty house make sealing and insulation faster and cheaper.
How long does attic and rim work take?
Usually one to two days for a single-family house.
Free Estimates in Rock Island, IL
Rock Island homeowners: ask for a written insulation quote.
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