Fast, Reliable Spray Foam Insulation Across San Antonio
Spray foam insulation in San Antonio typically runs $2,800 – $6,400 for a full attic retrofit, and most jobs are completed in one to two days. We install open-cell and closed-cell foam in homes from Alamo Ranch to Monte Vista, and we know exactly what a 140°F attic does to a cooling bill. Laurel Attic Insulation San Antonio sends background-checked, uniformed technicians with a written price before any foam is sprayed. Call (254) 279-0971 for a free estimate, and you’ll talk to a live person, not a queue.
Why Laurel Attic Insulation San Antonio Is San Antonio’s Preferred Spray Foam Insulation Company
Our crews work in San Antonio every day. We’ve sprayed foam in Alamo Ranch production homes, King William bungalows, Beacon Hill cottages, and the newer subdivisions pushing past 1604. That matters because San Antonio housing stock is not one thing. A 1920s pier-and-beam home with balloon framing needs a different foam strategy than a 2004 tract house built to minimum code. We know which one you have before we quote it.
Chase Whitaker leads our San Antonio team, and every job runs through the Relay Visibility Guarantee: a written price before work starts, live technician tracking, and before-and-after photo proof. San Antonio homeowners don’t have time for vague four-hour arrival windows or prices that change at the door. You’ll get a live, trackable arrival time and a digital invoice you can pay from your phone. If the foam isn’t done right, our 365-Day Done Right Promise means we come back and fix it. That’s in writing, on every job.
Open Cell Spray Foam in San Antonio
Open Cell Spray Foam in San Antonio is the retrofit most homeowners need when their attic hits 120°F by 10 a.m. and the second floor won’t cool below 80. Open-cell foam is a soft, spongy insulation that expands to fill the cavity, creating an air seal and an effective R-value around R-3.6 per inch. In San Antonio’s hot, semi-arid climate, open-cell foam applied to the roofline turns an oven attic into a conditioned space within a few degrees of the living area.
We often recommend open-cell foam when homeowners want to bring HVAC ducts inside the thermal envelope. Many San Antonio homes run flex duct through a vented attic, and that air is fighting 140°F heat. Sealing the roofline changes the game. A typical open-cell retrofit in a 2,000 – 2,600 square foot San Antonio home runs $3,200 – $5,800, depending on depth and air-sealing work.
Attic Roofline Sealing
We air-seal top plates, soffits, and penetrations before spraying. In Alamo Ranch homes especially, fiberglass batts settle to R-19 and leave thermal bypasses at the truss heels. Those bypasses are why west-facing bedrooms roast at 5 p.m. Open-cell foam fills those gaps so radiant heat stops pouring through.
CPS Energy Bill Reduction
Homeowners switching from settled fiberglass to open-cell roofline foam typically see a 15 – 30% reduction in July and August cooling loads. Our Alamo Ranch crew recently brought an attic from 142°F to within 5°F of the living space using 5.5 inches of Icynene Classic Plus, cutting that homeowner’s July cooling load by an estimated 28%.
Spray Foam Insulation Contractors in San Antonio
Spray Foam Insulation Contractors in San Antonio are not all the same, and the difference shows up in the details. We carry materials from Demilec and Icynene, match foam type to your roofline and framing, and document everything with photos. You’ll know exactly what we sprayed, where, and at what depth. A full Spray Foam Insulation retrofit done wrong can trap moisture or leave thermal bypasses, so we don’t rush and we don’t skip the prep.
Closed-cell foam runs $4.50 – $7.00 per board foot in this market and adds structural strength plus a vapor barrier. Open-cell runs $1.80 – $3.00 per board foot. For most San Antonio attics, open-cell on the roofline is the best value. We’ll show you the math in your written quote, not after the truck is unloaded.
One-Trip Retrofits for Busy Households
We show up with everything the job needs. No trips back to the shop, no “we’ll finish next week.” Most attic retrofits are done in a day or two, and you’ll have photo proof of the finished work before you pay.
Rim Joist and Garage Ceiling Work
In San Antonio homes with attached garages, we also foam rim joists and garage ceilings when that’s where the heat is getting in. It’s often the missing piece in a bedroom-over-garage that never cools down.
Trusted Brands We Service in San Antonio
We install foam from Icynene and Demilec, and we carry GreenFiber cellulose for dense-pack wall retrofits where foam isn’t the right call. Our techs choose the material that fits your home’s framing and your budget, not whatever is already on the truck. San Antonio homes run the gamut from 1920s balloon framing to 2010s tract builds, and one foam doesn’t fit all. We stock what we need for fast local turnaround, so you’re not waiting on a special order from Dallas.
Common Spray Foam Insulation Problems We See in San Antonio Homes
- Foam sprayed over settled fiberglass batts. The original 1990s or 2000s insulation isn’t removed or assessed, so thermal bypasses at truss heels remain. West-facing rooms still heat up by late afternoon, and the homeowner wonders why the foam “didn’t work.”
- Open-cell foam against a hot roof deck without a thermal barrier. In Alamo Ranch attics, rare winter cold snaps can cause condensation on the roof sheathing. We check for this and install the right barrier when needed.
- Under-sprayed foam at 2 – 3 inches in older pier-and-beam homes. In King William or Monte Vista, the uninsulated floors and single-pane windows still let heat in. A thin foam layer in the attic won’t move the needle on your cooling bill.
- Ignoring the rim joist in slab-on-grade tract homes. North and northwest San Antonio homes from the 1970s onward often leak air at the rim joist. Foaming the attic alone leaves a major air path open.
Pricing for Spray Foam Insulation in San Antonio, TX
An open-cell attic retrofit in San Antonio runs $2,800 – $6,400 for a typical 1,500 – 2,600 square foot home. Closed-cell runs higher, $4.50 – $7.00 per board foot, and makes sense when you need structural strength or a vapor barrier. Rim joist foaming typically adds $900 – $1,800. Garage ceiling foaming runs $700 – $1,400. What changes your price: attic size, existing insulation that needs removal, access difficulty, and how much air-sealing we need to do. You’ll get a written price before any foam is sprayed, every time. Call (254) 279-0971 and we’ll walk you through it.
We Also Serve Cities Near San Antonio
Laurel Attic Insulation serves San Antonio plus the surrounding communities of Converse and Universal City. If you’re in the northeast metro or near Randolph AFB, our crews route through there regularly. Same written-price guarantee, same live tracking, same one-trip goal.
Serving San Antonio, TX - Our Local Coverage Area
We’re based in the San Antonio 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 About Spray Foam Insulation in San Antonio
Most 1990s and 2000s production homes in Alamo Ranch were built to minimum code, which means R-19 fiberglass batts that settle and leave gaps at the truss heels. By August, your attic is 140°F, and that heat is radiating into the ceiling. Open-cell spray foam seals those bypasses and turns the attic into a conditioned space, which fiberglass can’t do. Call (254) 279-0971 for an exact quote on your home.
Yes, but it has to be done carefully. Older Beacon Hill homes often have no wall insulation, single-pane windows, and balloon framing that lets air flow straight from the crawl space to the attic. We typically recommend dense-pack GreenFiber cellulose for the walls and open-cell foam at the roofline. Foam alone in the attic won’t fix the wall and window losses in these homes.
Open-cell foam is better for most San Antonio attic retrofits because it’s less expensive per R-value and allows any moisture that gets through to dry to the interior. Closed-cell adds a vapor barrier and structural strength, which can be useful in some cases, but it costs two to three times more. In a vented attic that will become semi-conditioned, open-cell is usually the right call.
Not if it’s installed correctly. We inspect the roof deck before spraying and use open-cell foam, which lets the wood dry inward. Closed-cell foam on an old deck can trap moisture and lead to rot over time, so we avoid it in pre-1940 homes with original sheathing. Photo proof of every step is part of the job.
Most tract homes in the north and northwest, from Helotes to Universal City, take one day to prep and air-seal and one day to spray. Larger homes or those with settled insulation to remove first may take two to three days. We’ll give you a specific timeline in your written quote before work begins. Call (254) 279-0971 to get on the schedule.
Written by Chase Whitaker, Owner at Laurel Attic Insulation San Antonio, serving San Antonio and surrounding communities.