Fast, Reliable Spray Foam Insulation Across Selma
Spray foam insulation in Selma, TX typically runs $1.80-$3.20 per board foot installed, with most whole-attic retrofits falling between $2,400 and $5,800 depending on whether open-cell or closed-cell foam is used. We’re usually on-site in Selma within 24-48 hours of your call, and every job starts with a written price before any work begins. Dispatch and scheduling are coordinated from our San Antonio office, but our crews serve Selma locally and know the area’s housing stock inside out. Call (830) 549-6646 for a free estimate.
Why Topside Attic Insulation Seguin Is Selma’s Preferred Spray Foam Insulation Company
We’ve sealed and insulated more than 9,000 homes since 2016, and a significant concentration of that work has been right here in Selma. The reason is straightforward: this city’s housing stock is almost entirely production-built tract homes from the 2000s-2010s boom, so the entire city is essentially the same-age, same-deficiency retrofit market. Nearly every attic in Selma is sitting at the same settled-in R-30, which means we rarely see a “mixed” attic; we see the exact same failure repeated block after block. That repetition has made us fast and precise. We know where the builder cut corners before we pull the attic hatch.
Selma homeowners have left us strong reviews specifically citing our documentation - the before-and-after blower-door numbers, the photo record, the written scope they received before anyone started. Under The Haven Standard, every job closes with a Documented Photo Record and, on applicable jobs, before-and-after blower-door readings so you can verify the air-sealing result in a single figure. Our 365-Day Done Right Promise applies to all completed work, and a live person answers calls 24/7 - no voicemail loops, no callback windows measured in business days.
Our Spray Foam Insulation Services in Selma

Open-Cell Spray Foam in Selma
Open-cell spray foam runs $1.80-$2.40 per board foot in Selma and is our most common specification for attic roof decks and garage ceilings in the city’s slab-on-grade tract homes. The foam expands to roughly 100 times its liquid volume, filling irregular framing cavities tightly - critical in Selma’s production builds where trusses were set on 24-inch centers with minimal regard for continuous insulation barriers. Open-cell is vapor-permeable, which matters in Selma’s humid subtropical climate where attic moisture management is as important as thermal performance. We specify open-cell for roof deck applications where we need the assembly to dry to the interior.

Closed-Cell Spray Foam in Selma
Closed-cell spray foam runs $2.60-$3.20 per board foot locally and delivers R-6.5 per inch with a vapor barrier built in. We use it in Selma for rim joist applications, crawl space perimeter walls where present, and any conditioned space that needs maximum R-value in minimal thickness. The 2021 freeze exposed how little cold-side performance Selma’s code-minimum installs provide, and closed-cell at rim joists has become a standard upgrade for homeowners who want to see their HVAC system cycle normally during the next severe winter event. The material is rigid and adds structural racking strength - useful in garage ceiling applications where the ceiling drywall shows stress cracking from thermal movement.

Rim Joist Spray Foam in Selma
Rim joist spray foam is the single most overlooked deficiency in Selma’s production-built homes. The rim joist - the band of framing where the floor system meets the foundation - was left completely bare on nearly every slab-on-grade build in the 2000s-2010s boom. In winter, this is where cold air pours in; in summer, it’s where 150°F+ attic air drops into the wall cavity. We dense-pack or spray foam rim joists on almost every Selma job, and the blower-door improvement is immediate and measurable. A typical Selma rim joist treatment runs $800-$1,400 and pays for itself in reduced HVAC runtime within two to three cooling seasons.

Garage Ceiling Spray Foam in Selma
Garage ceiling spray foam has become one of our most requested services in Selma, particularly for homes near the I-35/Loop 1604 interchange. The builder left the garage ceiling as an uninsulated thermal bridge in nearly every tract home here - just drywall nailed to truss bottom chords with open framing gaps at the top plates. We apply open-cell spray foam directly to the garage ceiling, typically 5.5 inches for an R-19 assembly, which stops the 150°F attic air from radiating down into the garage and the rooms above. The secondary benefit is sound attenuation. Highway noise from I-35 and Loop 1604 drops measurably after garage ceiling treatment, and homeowners who bought near the commercial corridor for convenience tell us this upgrade changed how they use their bonus rooms and bedrooms over the garage.

What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Before
AfterTrusted Brands We Service in Selma
We source spray foam materials from Icynene, Demilec, and Owens Corning - no proprietary product lock-in, so we specify what performs best for your specific assembly rather than what a manufacturer requires us to move. Our Selma crews carry stock for common open-cell and closed-cell formulations, which means we don’t wait on material delivery to start your job. Every batch is documented with manufacturer lot numbers and applied density readings, included in your Documented Photo Record. If you have a preference based on prior research or a competing estimate, we’ll walk through the spec sheet with you - our Free Second Opinion on any written estimate applies to material selection too.
Common Spray Foam Insulation Problems We See in Selma Homes

- Settled builder-grade fiberglass: Selma’s blown fiberglass was installed at code-minimum R-30 in the 2000s-2010s boom, and 15-25 years of settling and compression has dropped effective R-value well below that mark - especially in the back corners of slab-on-grade tract attics where airflow is weakest and the material has compacted to 4 inches or less.
- Unsealed garage ceilings and rim joists: The production builders left these areas completely bare on nearly every Selma home, creating direct thermal bridges where 150°F+ attic air pours into the living space through open framing gaps and top plates - the homeowner feels it as a hot bedroom over the garage or cold floors at exterior walls.
- HVAC misdiagnosis masking insulation deficiency: Because Selma’s cooling season spans roughly seven months, underinsulated attics force air conditioning systems to run near-continuously, and homeowners burn through $8,000-$12,000 HVAC replacements before anyone checks the attic - we see this pattern weekly in Selma’s 2005-2015 vintage homes.
- Highway noise penetration at uninsulated wall and ceiling assemblies: Homes near the I-35/Loop 1604 interchange deal with significant traffic noise, and the uninsulated garage ceilings and exterior walls that are standard in Selma’s production builds do almost nothing to attenuate it - spray foam adds both thermal and acoustic performance.
Pricing for Spray Foam Insulation in Selma, TX
Most spray foam insulation jobs in Selma fall within these ranges:
- Open-cell spray foam (attic roof deck, garage ceiling): $1.80-$2.40 per board foot; typical 1,200 sq ft attic at 5.5 inches runs $2,400-$3,800
- Closed-cell spray foam (rim joist, structural applications): $2.60-$3.20 per board foot; typical rim joist treatment runs $800-$1,400
- Garage ceiling spray foam (open-cell, standard 2-car): $1,600-$2,400
- Whole-attic retrofit with air sealing and spray foam (open-cell roof deck + rim joist): $3,800-$5,800
What moves the number: accessibility of the attic hatch, existing insulation removal requirements, whether we need to build storage platforms or light fixtures before foaming, and whether the roof deck has active leaks that must be resolved first. Every Selma job begins with a written price - no work starts without it - and estimates are free. Call (830) 549-6646 for your specific quote.
We Also Serve Cities Near Selma

Our crews work throughout the I-35 corridor, including Selma and neighboring Seguin, New Braunfels, Cibolo, and Schertz. If you’re just outside Selma city limits or in a developing subdivision near the county line, we likely already service your area - call to confirm. Our Spray Foam Insulation team coordinates dispatch from San Antonio to keep response times tight across the corridor.
Serving Selma, TX - Our Local Coverage Area
We’re based in the Selma area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Spray Foam Insulation in Selma

Yes. The blown fiberglass installed in Selma’s 2008 production builds was code-minimum R-30 and has settled measurably over 15-17 years; we regularly find 4-inch depths in back attic corners where airflow is weakest, which performs closer to R-15 than its labeled value. The 2021 freeze exposed how little cold-side protection these installs provide, and the seven-month cooling season has been cooking the material the rest of the time. Call (830) 549-6646 for a free attic inspection and written price.
No. Even homes built in the last 5-8 years near Loop 1604 were insulated to code minimum, not performance standard, and the same settling and compression pattern is already visible in attics we inspect. The builder’s warranty on insulation typically expired at 1-2 years, and the deficiency only becomes obvious when the HVAC starts running continuously or the upstairs bedrooms won’t cool below 78°F. We provide a Free Second Opinion on any written estimate you’ve already received.
Yes. Open-cell spray foam at 5.5 inches in a garage ceiling provides significant sound attenuation for highway noise, and we see this as a dual-benefit upgrade in Selma homes near the interchange - thermal performance plus acoustic comfort. The foam mass absorbs sound energy that currently passes straight through uninsulated drywall into rooms above the garage. Call (830) 549-6646 for a written price on garage ceiling treatment.
Almost certainly. We were called out to a home near the I-35/Loop 1604 interchange where the homeowner couldn’t figure out why their two-year-old HVAC kept short-cycling despite annual tune-ups. When we opened the attic we found the builder-grade blown fiberglass had settled to about 4 inches depth across the back half of the attic, and the rim joists at the garage ceiling were completely bare. We dense-packed the rim joist, applied open-cell spray foam to the garage ceiling and attic roof deck boundary, and the homeowner reported the AC stopped running continuously by the next billing cycle. Your HVAC system is fine; it’s the building envelope that’s failing. Call for a blower-door test and written scope.
Open-cell spray foam on the attic roof deck plus dense-packed or sprayed rim joists at the foundation perimeter. This combination addresses both the thermal boundary at the roof and the air leakage path at the slab edge - the two most common failure points in Selma’s production-built homes. We rarely recommend closed-cell for full attic coverage in Selma’s climate; the vapor impermeability can trap moisture in assemblies that need to dry. Every recommendation comes with a written scope, written warranty, and before-and-after blower-door numbers so you can verify the result. Call (830) 549-6646 for your specific written price.
Ready to fix the insulation deficiency your builder left behind? Call (830) 549-6646 for a free estimate on spray foam insulation in Selma. Every job starts with a written price before any work begins, closes with a Documented Photo Record, and is backed by our 365-Day Done Right Promise. Under The Haven Standard: Have it in writing.
Written by Wes Okafor, Owner at Envelope Insulation Co., serving Selma since 2016.