Fully Insured, in St. Louis and surrounding areas. Attic Spray Foam Insulation · Closed Cell Spray Foam Insulation · Open Cell Spray Foam Insulation.
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All your work handled by qualified professionals in St. Louis
Sealed attics that keep St. Louis ductwork out of July heat and January cold
Included in your service
Two-pound foam for walls where Missouri vapor drive flips every season
Included in your service
The friendlier board foot for St. Louis attics and interior walls
Included in your service
Closed walls filled without opening up a Florissant ranch
Included in your service
Crawl spaces under St. Louis additions sealed against cold floors
Included in your service
The small job that finally warms a St. Louis basement and first floor
Included in your service
Turning a St. Peters garage into space you can use all year
Included in your service
The insulation that stops a Missouri shop from sweating and frosting
Included in your service
St. Louis warehouses and production builds kept on their own schedule
Included in your service
In a St. Louis attic the old comes out before anything new goes in
Included in your service
A full reset for St. Louis attics twenty years past their job
Included in your service
The cheapest comfort fix in a St. Louis house and it comes first
Included in your service
Continuous training, professional equipment, meticulous and code-compliant work
Full coverage on all our job sites, no exceptions
Emergencies, weekends, holidays: available when you need us
Response within 24h, no commitment, by phone or form
Available Mon-Sat 7am-6pm
Travel included · Free estimate within 24h
St Louis Spray Foam Insulation is a team of local, fully insured professionals based in St. Louis. We respond quickly in St. Louis and surrounding areas with professional equipment suited to every job.
Free estimate, transparent pricing, no subcontracting. Tell us about the space. We'll handle the rest.
📞 Call (314) 912-1801⭐⭐⭐⭐⭐ 4.9/5 · 29 verified Google reviews
“We had them seal up our attic access area with spray foam and it made such a difference. The crew was in and out in about 3 hours, and they cleaned up every bit of mess. Our upstairs is finally staying warm in winter.”
Attic Spray Foam Insulation
“Really impressed with how they handled our attic project. They sealed around the access hatch area and the whole attic space with open cell foam. The difference in our energy bills was noticeable right away.”
Attic Spray Foam Insulation
“Our old attic had almost no insulation left, so we called St Louis Spray Foam to re-insulate the whole thing. They removed the deteriorated stuff and sprayed open cell foam throughout. The crew was professional and the work looks great. Only thing is they took a bit longer than estimated, but the quality made up for it.”
Open Cell Spray Foam Insulation
“Had them come out to seal air leaks around our ventilation penetrations in the attic. Small job but they treated it like it mattered, which it does when you're trying to control your heating costs.”
Air Sealing
“Converted our garage into a workshop and needed it insulated. They sprayed closed cell foam on all the walls and the overhead door area. It's night and day, stays warm in winter and I can actually work out there now without freezing.”
Garage Spray Foam Insulation
“We had a cold basement and our energy guy recommended sealing the rim joists. St Louis Spray Foam came in, foamed the entire perimeter band joist area with closed cell, and it stopped the drafts completely. Very satisfied with the results.”
Rim Joist & Band Joist Spray Foam
“We're finishing a metal barn into living space out in the country and needed the whole thing insulated. They sprayed closed cell foam on the walls and roof deck, about 2,400 square feet. Professional crew, stayed on schedule, and the insulation job is solid.”
Metal Building & Barndominium Spray Foam
“Our 1950s house had zero insulation in the exterior walls. Instead of tearing everything apart, they drilled and injected closed cell foam into the cavities. Three days of work and we went from freezing to comfortable. Wish we'd done it sooner.”
Wall & Injection Foam InsulationReal photos of our work in St. Louis · Each image shows the final result achieved for our clients
| Service | Starting from | Description |
|---|---|---|
| Attic Spray Foam Insulation | From $1.50/sq ft | Open-cell roof-deck foam turns an attic that bakes at 140°F in July and freezes in January into conditioned space. The ductwork ends up inside the envelope. Every estimate lists the R-value target; the thickness per pass; the board footage. |
| Closed Cell Spray Foam Insulation | From $1.20/board ft | Two-pound closed-cell foam delivers R-6.5 per inch with its own vapor retarder and real structural stiffening. The right product for basement foundation walls; rim joists; metal buildings and any St. Louis wall where vapor drive flips direction between August and February. |
| Open Cell Spray Foam Insulation | From $0.55/board ft | Half-pound open-cell foam air-seals attics and walls at a friendlier price per board foot. Sound dampening between rooms and flat units comes with it. We spell out where it belongs, and where a basement or cold exterior wall calls for closed cell instead. |
| Wall & Injection Foam Insulation | From $2/sq ft | Injection foam fills closed frame walls through small drilled ports, no demolition. The retrofit answer for post-war frame and brick-veneer ranches with empty cavities. On solid double-brick city homes there is no cavity to fill; we tell you so before anyone drills. |
| Crawl Space Spray Foam Insulation | From $2,500 | Closed-cell foam on crawl space walls and subfloors ends the cold floors of January and the damp air of August. It seals crawl spaces under kitchen additions; sunrooms and enclosed back porches. Moisture problems get fixed first, we never spray over a wet crawl space. |
| Rim Joist & Band Joist Spray Foam | From $650 | Basement rim joists leak more cold air than almost anything in a St. Louis house. Closed cell seals every bay along the top of the foundation, the small-ticket job with the fastest comfort payback. Cantilevers and bonus-room floors are handled the same way. |
| Garage Spray Foam Insulation | From $1,200 | Garage ceilings under bonus rooms and walls shared with the house are foam-sealed against July heat and January cold. Workshop conversions are handled the same way. The difference between a storage box and usable space twelve months a year. |
| Metal Building & Barndominium Spray Foam | From $1.75/sq ft | Closed-cell foam stops a Missouri metal building from sweating in spring and frosting inside in winter. Shops; barndominiums; pole barns and ag buildings sealed against condensation from Franklin County acreage to Earth City warehouses. |
| Commercial & New Construction Spray Foam | Free commercial estimate | Warehouses; offices; churches and production builders served on schedule. Code-compliant assemblies come with documentation your county or city inspector will actually accept. Phased work keeps your operation running from Earth City to the Wentzville corridor. |
| Insulation Removal | From $950 | Old blown-in and batts vacuumed out before any new foam goes in, never buried. We also cut out failed spray foam; the job most installers will not touch. Vermiculite is common in older St. Louis attics and gets flagged for testing; never disturbed. |
| Insulation Replacement & Re-Insulation | From $2,800 | The full reset: old material removed; gaps air-sealed; new foam installed to current code R-values. The right call when insulation is flattened; mouse-fouled; soaked after storm damage or simply twenty years past its job. |
| Air Sealing | From $650 | Top plates; can lights; chimney chases and attic hatches leak more heated and cooled air than most walls. We seal the leaks before insulating, the step that makes every R-value actually perform and the cheapest comfort fix in a St. Louis house. |
Indicative rates based on typical project size, your exact quote depends on scope, materials, and site access. Free estimate, no commitment. See full pricing guide →
Spray Foam Insulation in St. Louis · Response within 24h · No commitment · ☎ (314) 912-1801
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