Ballwin's 1970s and 1980s ranches and split-levels were built with attics that have baked at 130 to 150 degrees in July and dropped into the teens in January for nearly fifty years, and the original fiberglass insulation packed down long ago. Your cooling and heating bills tell the story, and so does the upstairs bedroom that never reaches temperature in summer or winter.
St. Louis Spray Foam Insulation has been serving Ballwin and the surrounding St. Louis area since 2012. We know the houses here, the way basements sit below grade, the way attics run above finished rooms, and the humid summers and cold winters that make air sealing and thermal control non-negotiable. When a Ballwin homeowner calls us, it's usually because a room is uncomfortable, the bills have gotten out of hand, or moisture has shown up where it shouldn't be.
Spray Foam Insulation in Ballwin (63011)
The typical Ballwin home sits on a basement and has an attic above a finished lower level. That combination means the attic has to work hard. In summer, heat radiates down through the roof deck and into the living spaces below, and the air conditioning runs continuously trying to keep up. In winter, warm air rises into the attic, meets the cold roof deck, and moisture condenses on framing and insulation. Add the St. Louis mixed-humid climate, where vapor drive flips with the seasons, and you get why original fiberglass insulation fails: it compresses, it holds moisture, and it no longer stops air leakage.
Spray foam solves both problems at once. Closed-cell foam stops air movement and carries an R-value around 6 per inch, so a 5.5-inch pass meets most energy code requirements for attics in Missouri. Open-cell foam is cheaper and still stops air, but it's vapor-open, so it's the right choice only when you want to let moisture through to a vented attic. The key is that spray foam adheres to framing, roof decking and rim joists, and seals the gaps and rim details that fiberglass can never reach. Wall cavities in older Ballwin homes are often hollow, and injection foam fills them without tearing into drywall.
Our team has been doing this work in Ballwin and across the St. Louis area for over a decade. We write estimates with R-value and thickness specifications so you know exactly what you're paying for, and we're fully insured for the work.
Our services in Ballwin
- Attic Spray Foam Insulation in Ballwin · Open-cell roof-deck foam turns an attic that bakes at 140°F in July and freezes…
- Closed Cell Spray Foam Insulation in Ballwin · Two-pound closed-cell foam delivers R-6.5 per inch with its own vapor retarder…
- Open Cell Spray Foam Insulation in Ballwin · Half-pound open-cell foam air-seals attics and walls at a friendlier price per…
- Wall & Injection Foam Insulation in Ballwin · Injection foam fills closed frame walls through small drilled ports…
- Crawl Space Spray Foam Insulation in Ballwin · Closed-cell foam on crawl space walls and subfloors ends the cold floors of…
- Rim Joist & Band Joist Spray Foam in Ballwin · Basement rim joists leak more cold air than almost anything in a St. Louis…
- Garage Spray Foam Insulation in Ballwin · Garage ceilings under bonus rooms and walls shared with the house are…
- Metal Building & Barndominium Spray Foam in Ballwin · Closed-cell foam stops a Missouri metal building from sweating in spring and…
- Commercial & New Construction Spray Foam in Ballwin · Warehouses; offices; churches and production builders served on schedule.
- Insulation Removal in Ballwin · Old blown-in and batts vacuumed out before any new foam goes in, never buried.
- Insulation Replacement & Re-Insulation in Ballwin · The full reset: old material removed; gaps air-sealed…
- Air Sealing in Ballwin · Top plates; can lights; chimney chases and attic hatches leak more heated and…
How a Job Works in Ballwin
We start with a free on-site assessment. We walk your attic, crawl space, garage or wall cavities with you, identify where air leaks and thermal loss are happening, explain what the code requires at your address, and price the work honestly. If your insulation is wet, contaminated or sitting on a leaking roof, we tell you that has to be fixed first or we don't spray. That's not a caveat; it's how you know you're working with someone who won't cut corners.
On the day of the work, our team sets up mechanical ventilation so the spray odor vents outside, not into your living space. We mask off areas that shouldn't be sprayed, apply the foam to the specified thickness in controlled passes, and let it cure. The smell is real during application and for a few hours after, but it clears quickly with ventilation running. We recommend staying out of the attic or crawl space for 24 to 48 hours while the foam fully cures; if you're home, keep windows open and doors closed to manage air movement. Once cured, the foam is inert and odorless.
We clean up the job site, remove protective coverings, and walk through with you to confirm everything is done right. Your property leaves clean.
Attic spray foam in a typical Ballwin ranch or split-level runs from $1.50 per square foot for open-cell foam to $1.20 per board foot for closed-cell, depending on thickness and the R-value your code requires. A 1,200-square-foot attic with 5.5 inches of closed-cell foam usually lands in the $7,000 to $9,000 range, but that varies with access, what has to be removed first, and whether rim joists and band joists need sealing too. Wall injection foam for a closed cavity runs around $2 per square foot. If your insulation is wet or failing and has to come out first, removal adds $950 and up depending on volume. Crawl spaces start at $2,500 and scale with area and moisture conditions. The most important thing is to get a written estimate that names the R-value, thickness in inches, the type of foam, and what prep work is included. Call us at (314) 912-1801 for a free estimate tailored to your Ballwin home.
✅ Written Estimates with R-Value & Thickness Specs, fully insured for work in Ballwin and nearby areas.
