Spray Foam Insulation in Kirby - Same-Day Service, Done Right the First Time

Fast, Reliable Spray Foam Insulation Across Kirby

Spray foam insulation in Kirby typically runs $1.80-$3.20 per board foot for open-cell and $3.50-$5.50 for closed-cell, with most whole-home retrofits falling between $3,800 and $8,500 depending on accessible cavity area and whether we’re working around existing conditions. We’re Envelope Insulation Co., and our crews are in Kirby regularly - dispatch runs from our San Antonio office, and we can usually be on-site in Kirby within a day or two of your call. If you’ve got a 1950s ranch off Ackerman Road or a 1960s bungalow near Kirby Boulevard with original fiberglass that’s settled to dust, we know what we’re walking into. Call (830) 529-7780 and a live person will pick up, 24/7.

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Why Topside Attic Insulation Boerne Is Kirby’s Preferred Spray Foam Insulation Company

We’ve sealed and insulated over 9,000 homes since 2016, and a significant share of those have been in Kirby’s landlocked pocket of aging ranches and bungalows. Our Kirby customers tend to find us after they’ve already had one bad experience - a contractor who blew insulation over unsealed top plates, or sprayed foam without checking what was in the wall first. They read our three-star reviews as carefully as our five-stars, and they stay because we show them blower-door numbers, not promises.

Response time to Kirby is typically same-day or next-day for assessments, and we schedule the work once you’ve got a written price in hand. Every job starts with Haven Standard Clause 1: flat price, written scope, written warranty before anyone lifts a tool. Our technicians are background-checked, uniformed, and named - you’ll get a text when they’re on the way. Under Haven Standard: Arrive on schedule, you get a named technician and a text when they are on the way.

What separates us in Kirby specifically is that we understand these houses were built to 1940s-1970s standards, not modern specs. We don’t apply new-construction thinking to retrofit reality. Our Spray Foam Insulation team carries both closed-cell and open-cell rigs because Kirby’s housing stock demands the right call for each assembly, not whatever foam is on sale this quarter.

Our Spray Foam Insulation Services in Kirby

Closed-Cell Spray Foam

Closed-cell spray foam - a rigid, high-density foam that adds structural rigidity and acts as its own vapor barrier - is often the right choice for Kirby’s older homes. In wall cavities that were left hollow in the 1950s and 60s, or where original gypsum has no vapor barrier behind it, closed-cell at 2-3 inches gives you R-7 per inch and blocks humidity migration. We see this call most often on slab-on-grade ranches near FM 78 where the east and west walls take direct solar load and the interior face of the siding has been breathing unconditioned air for 60 years. Typical closed-cell jobs in Kirby run $3.50-$5.50 per board foot, and a full wall cavity fill on an 1,100-square-foot ranch usually falls between $4,200 and $6,800.

Open-Cell Spray Foam

Open-cell spray foam - a softer, more permeable foam that expands to fill irregular cavities - works well in Kirby’s vaulted ceilings and attic roof decks where you need depth for R-value but don’t want to trap moisture against original decking. At R-3.6 per inch, it takes more depth to hit code, but it breathes, which matters in 150°F attics where humidity can accumulate against the roof sheathing. We used open-cell in the vaulted living-room ceiling of that 1950s ranch off Ackerman Road - the one where we sealed attic-duct chases that had been bleeding cooled air since the house was built. The homeowner noticed the back bedrooms finally held temperature through a 98°F August afternoon without the AC short-cycling. Open-cell in Kirby typically runs $1.80-$3.20 per board foot.

Rim Joist Spray Foam

Rim joists - the perimeter band where your floor framing meets the foundation - are the leakiest detail in most Kirby slab homes, and they were almost never sealed in original construction. In a 1960s ranch near Kirby Middle School, we routinely find daylight and air movement between the sill plate and the block. Closed-cell spray foam here is non-negotiable: open-cell stays too soft and air-permeable, letting Bexar County humidity migrate into the wall assembly anyway. We spray 2-3 inches of closed-cell to seal and insulate this critical junction, and we check for bulk water intrusion first - because sealing a wet rim joist traps rot, not air. Rim joist-only jobs in Kirby typically run $1,200-$2,400 depending on linear footage and access.

Garage Ceiling Spray Foam

Kirby’s attached and detached garages - many built as afterthoughts to the original 1950s-60s ranches - share a common wall with conditioned space and leak like sieves. The garage ceiling is often uninsulated drywall with a scuttle hole into the attic, creating a thermal bypass that pulls conditioned air out of adjacent bedrooms. We spray closed-cell or open-cell foam on the garage ceiling depending on whether there’s living space above, and we always seal the top plates and penetrations first. In summer, an uninsulated garage ceiling in Kirby can reach 120°F, radiating heat into the master bedroom above it all night. Garage ceiling jobs typically run $1,800-$3,500.

Spray Foam Roof Deck

For Kirby homeowners who want to convert their vented attic to conditioned space - a smart move when your ductwork runs through a 150°F attic - we spray open-cell foam directly to the roof deck underside at 5-7 inches for R-19 to R-25. This brings the attic inside the thermal envelope and eliminates the extreme temperature swing that degrades flex duct and shortens HVAC life. We only do this after blower-door testing and targeted air sealing of the original ceiling plane, because a conditioned attic with leaks is a humidity problem, not a solution. Roof deck jobs in Kirby range from $4,500 to $8,500 depending on pitch, accessibility, and square footage.

Trusted Brands We Service in Kirby

We source spray foam materials from Icynene, Demilec, and Owens Corning - no proprietary lock-in, no mystery chemicals. For Kirby’s humidity and heat load, we specify HFO-blown closed-cell formulations with low global-warming potential and established track records in south-central Texas retrofit conditions. We keep common densities and rig configurations stocked locally, so we’re not waiting on freight when your job is scheduled. Every batch is documented with lot numbers and application parameters, and that record goes in your job file alongside the photo documentation and blower-door readings.

Common Spray Foam Insulation Problems We See in Kirby Homes

• Applying closed-cell foam to the interior face of original 1940s-70s slab-on-grade wall cavities without checking for moisture intrusion. These walls have no modern vapor barrier, and trapping humidity against gypsum and framing creates rot that wouldn’t happen in a new suburban build. We probe for bulk water and specify the foam type accordingly.
• Foaming only the attic floor and leaving uninsulated flexible duct runs in the 150°F+ attic unwrapped. This is the single biggest post-insulation complaint we hear from Kirby homeowners: “We spent thousands and our bills didn’t drop.” The duct wrap is part of the system, not an afterthought.
• Over-applying open-cell foam at rim joists in older crawl-adjacent details where it stays soft and air-permeable. Bexar County humidity migrates right through it. Rim joists get closed-cell, period, or you’re paying twice.
• Blowing new insulation over collapsed original batts without air sealing first. We pull the degraded material, seal top plates, can lights, and penetrations, then insulate. The Haven Standard says sealed first, then insulated - in that order.

Pricing for Spray Foam Insulation in Kirby, TX

We Also Serve Cities Near Kirby

Our crews work throughout the San Antonio metro area, including Kirby and nearby Boerne, Fair Oaks Ranch, Scenic Oaks, and Helotes. Same standards, same documentation, same written price before work starts - no matter which city we’re in.

FAQs - Spray Foam Insulation in Kirby