Clayton's mix of 1920s-40s brick bungalows, meticulously renovated historic homes, and new downtown condos all share one thing: attics that bake at 130-150 degrees in July and drop into the teens in January, and basements or crawl spaces where humidity and condensation show up the moment a cold front rolls through. St. Louis Spray Foam Insulation has been sealing and insulating Clayton homes and commercial properties since 2012, because the air leaks and thin insulation that plague this neighborhood cost money every month.
Whether you're in one of Clayton's charming older neighborhoods or in a newer construction property near the downtown corridor, we know exactly what your attic, crawl space, and rim joists need to stay tight and dry year-round.
Spray Foam Insulation in Clayton (63105)
Clayton's housing stock tells the story. The 1920s-40s brick bungalows and story-and-a-half cottages with knee walls and finished half-story attics are prone to ice dams in winter and wild temperature swings in July. The older renovated homes keep their solid multi-wythe brick walls and flat roofs behind parapets, with floor joists set into brick pockets over fieldstone basements. New construction downtown runs condos and office shells that need tight thermal and air barriers from day one. All of it sits on basements or crawl spaces where the mixed-humid St. Louis climate means vapor drive flips with the seasons: outward through cold winters and inward through humid summers. That means every assembly has to handle both directions, and half-measures do not work.
We spray closed-cell and open-cell foam in attics, walls, crawl spaces, rim and band joists, and around garage headers. We remove failed or contaminated insulation and replace it. We seal the air leaks that open-cell or blown-in insulation cannot reach. We've been doing this work in Clayton and across the St. Louis area since 2012, and we know the building code that applies at your address and the building official who enforces it.
Our services in Clayton
- Attic Spray Foam Insulation in Clayton · Open-cell roof-deck foam turns an attic that bakes at 140°F in July and freezes…
- Closed Cell Spray Foam Insulation in Clayton · Two-pound closed-cell foam delivers R-6.5 per inch with its own vapor retarder…
- Open Cell Spray Foam Insulation in Clayton · Half-pound open-cell foam air-seals attics and walls at a friendlier price per…
- Wall & Injection Foam Insulation in Clayton · Injection foam fills closed frame walls through small drilled ports…
- Crawl Space Spray Foam Insulation in Clayton · Closed-cell foam on crawl space walls and subfloors ends the cold floors of…
- Rim Joist & Band Joist Spray Foam in Clayton · Basement rim joists leak more cold air than almost anything in a St. Louis…
- Garage Spray Foam Insulation in Clayton · Garage ceilings under bonus rooms and walls shared with the house are…
- Metal Building & Barndominium Spray Foam in Clayton · Closed-cell foam stops a Missouri metal building from sweating in spring and…
- Commercial & New Construction Spray Foam in Clayton · Warehouses; offices; churches and production builders served on schedule.
- Insulation Removal in Clayton · Old blown-in and batts vacuumed out before any new foam goes in, never buried.
- Insulation Replacement & Re-Insulation in Clayton · The full reset: old material removed; gaps air-sealed…
- Air Sealing in Clayton · Top plates; can lights; chimney chases and attic hatches leak more heated and…
How a Job Works in Clayton
We start with a free on-site assessment. We walk your attic, crawl space, or the wall cavities you're concerned about. We look for air leaks, moisture, failed or missing insulation, and access issues. We measure the area and talk through whether you need closed-cell foam for its vapor barrier and strength, or open-cell foam for its cost and breathability. We explain what has to come out first, what the code requires at your address, and what the finished R-value and thickness will be. We give you a written estimate with R-value and thickness specs, not a vague price per square foot.
On the day of the work, our fully insured crew sets up mechanical ventilation and keeps the space properly aired during the spray and cure. We control the foam thickness pass by pass, maintain the manufacturer ratio and drum temperature, and follow the re-entry window of twenty-four to forty-eight hours before you can occupy the space again. If your attic or crawl space is wet, contaminated, or leaking, we fix the moisture first or we walk away. We do not spray over a bad substrate.
When we're done, we clean up completely and walk through the finished job with you. Your property is left clean, and you have a clear understanding of what was done and why.
Attic spray foam in Clayton typically runs from $1.50 per square foot for open-cell to $1.20 per board foot for closed-cell, depending on the area to cover, the R-value you need, and whether existing insulation has to be removed first. A crawl space foam job usually starts around $2,500 and climbs with the square footage and moisture condition. Rim and band joist sealing runs from $650 up. Wall injection foam for a closed cavity starts around $2 per square foot. Insulation removal and replacement for a contaminated or failed attic typically starts at $950 for removal and $2,800 for the replacement foam. The real cost drivers are the total area, the thickness and R-value the code requires at your address, access difficulty, and whether you have old insulation that has to come out before the new foam goes in. Call us at (314) 912-1801 for a free estimate. We'll measure your space, explain what you need, and give you a firm price before we start.
✅ Written Estimates with R-Value & Thickness Specs, fully insured for work in Clayton and nearby areas.
