Fast, Reliable Spray Foam Insulation Across Leon Valley
Spray foam insulation in Leon Valley typically costs $1.80-$3.20 per board foot for open-cell and $3.50-$5.50 for closed-cell, with most full attic retrofits running $3,800-$7,200 depending on cavity depth and prep work. Most Leon Valley jobs are completed in one to two days, and crews are dispatched from our San Antonio office with same-week availability for standard bookings.
We’ve worked the 1950s-1970s ranch homes that dominate Leon Valley long enough to know what we’re walking into: shallow attic cavities, original fiberglass batts that have compressed to near-nothing, and rim joists that were never sealed against the slab. If you live off Bandera Road, Grissom Road, or anywhere in the 78238 zip, your home almost certainly fits this profile. Call (830) 529-7780 for a free estimate with a written price before any work starts.
Why Topside Attic Insulation Boerne Is Leon Valley’s Preferred Spray Foam Insulation Company
We’ve sealed and insulated homes in Leon Valley since before Winter Storm Uri exposed how poorly these slab-on-grade ranches perform in cold events. Our Spray Foam Insulation in Leon Valley work is documented with before-and-after blower-door numbers on every applicable job, so you see the CFM50 reduction you paid for, not just a promise.
Response time to Leon Valley neighborhoods is typically same-day for estimates and within a week for crew dispatch. We know the city’s independent permitting system, which operates separately from San Antonio’s, and we handle the paperwork so your inspector sees a completed, code-compliant thermal envelope, not a half-finished retrofit.
Our reviews from Leon Valley customers consistently note two things: the written price they received before anyone lifted a tool, and the photo documentation they walked away with. Under The Haven Standard, every job begins with a flat price and ends with a documented record. No exceptions.
Our Spray Foam Insulation Services in Leon Valley
Open-Cell Spray Foam
Open-cell spray foam runs $1.80-$2.80 per board foot in Leon Valley and is our standard choice for attic floors in the city’s shallow-cavity ranch homes. At roughly 3.5 inches per pass, it fills the 6-inch joist bays common in 1960s construction while remaining vapor-permeable, which matters in Leon Valley’s hard-water humidity environment where moisture needs a path out, not a trap underneath. We specify open-cell Icynene for most attic applications here, applied only after the original compressed fiberglass has been removed and the top plates sealed.
Closed-Cell Spray Foam
Closed-cell spray foam costs $3.50-$5.50 per board foot and delivers R-6.5 per inch, making it essential for Leon Valley’s rim joists, garage ceilings, and any roof deck application where space is limited and vapor impermeability is required. On slab-on-grade homes throughout the 78238 area, the rim joist is often the single largest unsealed gap in the building envelope, and closed-cell Demilec is our go-to for locking that boundary. We never spray closed-cell over unsealed surfaces or degraded existing insulation, the shortcut that traps moisture and fails inspection.
Rim Joist Spray Foam
Rim joist spray foam in Leon Valley runs $800-$1,400 for a typical 1,200-square-foot ranch, and it’s the most overlooked upgrade in these homes. The concrete slab meets the band joist with nothing but a sill plate and often a gap you can slide a finger through. During Winter Storm Uri, homes we’d sealed at the rim joist maintained livable temperatures days longer than identical floor plans that hadn’t been touched. We use closed-cell here exclusively, applied after mechanical and plumbing penetrations are sealed with acoustic sealant.
Garage Ceiling Spray Foam
Garage ceiling spray foam in Leon Valley costs $1,200-$2,400 depending on whether the ceiling is finished or open joist. Many Bandera Road corridor homes have bedrooms directly above uninsulated garage space, and the temperature swing radiates through the floor assembly. We treat garage ceilings as conditioned envelope boundaries, not afterthoughts, with open-cell foam in open joist bays and careful sealing around any living-space ductwork that passes through.
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.
Trusted Brands We Service in Leon Valley
We source spray foam materials from Owens Corning, Johns Manville, Knauf, and other manufacturers including Icynene and Demilec, with no proprietary lock-in that limits what’s appropriate for your specific assembly. For Leon Valley’s retrofit market, this matters because a 1968 ranch with 2×6 attic joists needs a different approach than a 1974 home with scissor trusses and a 10-inch cavity. We stock local inventory for fast turnaround, and our crews are trained on multiple product lines so the specification follows the building science, not a distributor agreement.
Common Spray Foam Insulation Problems We See in Leon Valley Homes
- Spray foam applied over degraded original fiberglass. In Leon Valley’s shallow 1960s attics, we regularly find contractors who blew or sprayed new insulation directly over compressed, moisture-stained batts without removal. The degraded R-value stays in place, trapped under the new foam, and the moisture continues cycling. We remove first, then seal, then insulate.
- Rim joists and attics sprayed without correcting ventilation. Leon Valley’s hard-water humidity moves through poorly vented attics and condenses against new spray foam if the ventilation strategy isn’t addressed first. We assess soffit and ridge venting before specifying any foam application.
- Attic access panels and can lights left as thermal bypasses. Even a thorough R-38 spray foam job is undermined when recessed can lights and the attic hatch aren’t sealed. In 150°F+ summer attic conditions, these bypasses become convective loops that move conditioned air out and hot air in.
- Permits pulled through San Antonio instead of Leon Valley. Because Leon Valley operates its own code enforcement, jobs inspected by the city’s own inspectors fail when the permitting is wrong. We file correctly the first time.
Pricing for Spray Foam Insulation in Leon Valley, TX
| Application | Price Range | Typical Leon Valley Home |
|---|---|---|
| Open-cell attic floor (1,200 sq ft) | $3,800-$5,400 | 1960s ranch, 6″ joists |
| Closed-cell rim joist | $800-$1,400 | Slab-on-grade, 1,200 sq ft |
| Closed-cell roof deck | $5,500-$8,200 | Shallow cavity, full conversion |
| Garage ceiling | $1,200-$2,400 | Bedroom above garage |
| Full envelope (attic + rim + garage) | $6,200-$9,800 | Complete retrofit |
What moves you within these ranges: cavity depth, whether original insulation requires removal, accessibility for hose runs, and the extent of air sealing needed before foam goes in. Every Leon Valley estimate includes a written price before any work starts, with no change orders unless you add scope. We also provide a Free Second Opinion on any written estimate you’ve received, read with you line by line. Call (830) 529-7780 to schedule.
We Also Serve Cities Near Leon Valley
Our crews work throughout Bexar County and the Hill Country corridor, including Spray Foam Insulation service to Boerne, Fair Oaks Ranch, Scenic Oaks, and Helotes. Dispatch and scheduling are coordinated from our San Antonio office, with local crews serving each market.
Serving Leon Valley, TX - Our Local Coverage Area
We’re based in the Leon Valley 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 Leon Valley
Because your original fiberglass has likely compressed to R-4 or less and is moisture-stained from decades of humidity cycling, adding more material on top traps the degraded layer underneath and does nothing to stop air leakage at the top plates and penetrations. Spray foam, applied after removal and proper air sealing, creates both the thermal boundary and the air barrier in one assembly. Call (830) 529-7780 and we’ll show you exactly what we find in your attic, with photos.
Leon Valley requires its own permit through the city’s independent code enforcement office, not San Antonio’s. We handle this filing as part of every job, and our scope documents are written to pass Leon Valley’s specific inspections, which routinely flag pre-1980 attics for settled or moisture-damaged insulation. The permit cost is included in your written price.
Current Texas energy code specifies R-38 minimum for attic insulation, and we design to that or better depending on cavity depth. In Leon Valley’s 6-inch joist bays, open-cell spray foam at 5.5 inches achieves R-19-R-21, so we often supplement with additional insulation strategies or specify closed-cell where space is tighter. The exact target depends on your specific assembly, which we assess during the estimate.
Yes, particularly when the rim joist is sealed with closed-cell foam and the attic is properly air-sealed. Leon Valley’s slab-on-grade homes have no basement buffer, so the rim joist and attic are the entire thermal envelope. Homes we’d completed with full envelope sealing before February 2021 maintained interior temperatures 15-25 degrees longer than unsealed neighbors. The air sealing matters as much as the R-value.
Roof deck spray foam converts the attic to conditioned space, which can make sense if your HVAC equipment lives in the attic and you’re fighting 150°F+ summer temperatures that reduce equipment lifespan. The tradeoff is cost, $5,500-$8,200 versus $3,800-$5,400 for floor application, and it requires careful ventilation strategy to avoid moisture issues. We assess whether your specific home justifies the investment during the estimate, with blower-door numbers to back the recommendation.
Call (830) 529-7780 for a free estimate with a written price before any work starts. Our live answering is available 24/7.
Written by Wes Okafor, Owner at Envelope Insulation Co., serving Leon Valley under The Haven Standard since 2016.