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

Fast, Reliable Spray Foam Insulation Across San Antonio

Spray foam insulation in San Antonio typically costs $2.50 to $6.50 per square foot installed, depending on whether you choose open-cell or closed-cell and whether we’re retrofitting an existing home or insulating new construction. Most attic jobs run $4,800 to $9,500, and wall cavity retrofits on older brick ranch homes usually land between $6,000 and $12,000. Call (361) 213-9499 and we’ll send a technician with a written price before any work starts.

Call (361) 213-9499

We know San Antonio homes because we work in them every week. The 1970s ranch off Wurzbach Parkway, the 1950s brick box in Terrell Hills, the two-story traditional off Bandera Road. Each one has its own set of problems, and spray foam fixes most of them when it’s applied by someone who understands how this city’s heat and humidity interact with old framing, hollow brick cavities, and under-ventilated attics. Our Spray Foam Insulation team serves every corner of the metro, from Helotes to Universal City, with the same protocol on every job: named technician, written price, and a 365-day guarantee in writing.

Why Aspen Attic Insulation San Antonio Is San Antonio’s Preferred Spray Foam Insulation Company

We’ve built our reputation in San Antonio on something simple: the person we say is coming to your house is the person who shows up. Every technician is background-checked, identity-verified, and arrives in a marked uniform with a photo ID badge. Before the visit, you get their name and photo sent to you. That matters to a parent home alone with young kids, and it matters to an older homeowner who doesn’t want to guess who’s at the door. The Threshold Standard is what we operate under, and it’s non-negotiable.

Garrett Sloane set the tone for how we work: plain talk, written prices, and a guarantee that actually means something. Our 365-Day Done Right Promise covers labor and materials for a full year. If a repair fails, we come back free. No prorated nonsense, no fine print that evaporates when you actually need it. San Antonio homeowners call us back for second and third projects because the first one went exactly the way we said it would.

Scheduling for San Antonio runs fast. Homes inside Loop 1604 typically see a technician same-day or next-day for estimates. Emergency calls, like a roof deck condensation drip in August, get prioritized. A live person answers the phone 24/7. No voicemail loops, no call-back windows. You call, a human picks up, and you get a straight answer about when we can be there.

Spray Foam Attic Insulation in San Antonio

Our Attic Insulation in San Antonio is the single most effective fix for the heat that turns your attic into a 140°F oven from May through September. We apply open-cell foam directly to the underside of the roof deck, creating an air seal that stops radiant heat from ever reaching your living space. In a typical 1970s-1990s ranch with blown fiberglass that has settled to R-8 or worse, switching to spray foam can cut July and August cooling costs by 25 to 40 percent.

Most San Antonio attic jobs run $4,800 to $9,500 depending on square footage, roof pitch, and whether we need to remove old insulation first. That price includes cleanup, and it’s delivered in writing before we touch anything. Garrett Sloane refuses to let a crew start work without the homeowner holding a firm number in their hand.

Roof Deck Application for Summer Heat

The roof deck is where San Antonio’s heat battle is won or lost. Closed-cell foam at 2 to 3 inches creates a thermal break that keeps the attic within a few degrees of your conditioned air. Open-cell at 5 to 6 inches does the same job at a lower material cost, but it needs proper ventilation planning so humidity doesn’t get trapped. We’ll tell you which one fits your house and your budget, and we’ll put it in writing.

Retrofit Over Settled Fiberglass

If your northwest-side home still has the original blown fiberglass from the 1980s, it has settled, been disturbed by cable installers and AC techs, and is doing far less than its labeled R-value. We remove it, air-seal the attic floor, and spray foam the roof deck. The difference is immediate: the upstairs bedroom that never cools below 78°F finally holds 72°F in August.

Spray Foam Wall Insulation in San Antonio

Spray Foam Wall Insulation in San Antonio is the retrofit solution for something most homeowners don’t realize they have: completely empty wall cavities. In Terrell Hills, Alamo Heights, and older pockets of Monte Vista, pre-1970 brick-veneer ranches were often built with no wall insulation at all. Just hollow stud bays behind the brick. Closing that gap with injected foam is the single biggest comfort upgrade you can make that doesn’t involve touching drywall.

We drill through exterior mortar joints, inject closed-cell foam into each cavity, and patch every hole with color-matched mortar. When we’re done, the brick face looks untouched. Wall cavity retrofits in San Antonio typically run $6,000 to $12,000 depending on the number of exterior walls and total square footage. The written price covers everything: drilling, foam, patching, and cleanup.

Brick Veneer Cavity Injection

This is the job that defines older San Antonio housing. We pull a brick from the mortar line, inject Demilec closed-cell foam through a wand that reaches every corner of the stud bay, then patch the joint so it matches the surrounding color. In an Alamo Heights 1960s brick ranch off Broadway, our crew worked this way and the homeowner’s afternoon bedroom temperature dropped 12°F the first week of June. That’s not marketing talk. That’s what sealed cavities do.

Knob-and-Tube Circuit Mitigation

Pre-1960 homes in Terrell Hills and Alamo Heights often still have knob-and-tube wiring in exterior walls. Spray foam over live knob-and-tube traps heat and can trip breakers. We identify those circuits before we ever inject foam and work with a licensed electrician to upgrade them first. We won’t bury a fire hazard in insulation and call it a job well done.

Trusted Brands We Service in San Antonio

We stock Icynene, Demilec, and Owens Corning spray foam products and offer a San Antonio Reflectix service specific to local climate needs, so we’re not waiting on a distributor when your job is scheduled. Closed-cell for humid attics and brick cavity injection. Open-cell for roof decks where ventilation is already sound. The brand follows the need, not the other way around. If a specific product performs better for your home’s age and construction type, that’s what goes in. We’ll tell you which one and why, in plain English, before you spend a dollar.

Common Spray Foam Insulation Problems We See in San Antonio Homes

• Open-cell foam absorbing summer humidity: San Antonio attics routinely hit 90% relative humidity in August. Open-cell foam installed without proper roof deck ventilation absorbs that moisture and loses R-value. We ventilate first, then foam, so you don’t pay for insulation that slowly quits on you.
• Foam over knob-and-tube wiring: Pre-1960 homes in Terrell Hills and Alamo Heights hide live knob-and-tube circuits inside exterior walls. Foam traps heat around old wiring and can trip breakers or worse. We inspect circuits before injecting anything.
• Closed-cell foam applied too thin under metal ‘cool roof’ panels: San Antonio’s push for reflective metal roofing created a new failure mode. Foam applied too thin under those panels lets AC duct sweat condense and drip onto ceiling drywall by August. We spec thickness based on your roof type, not a generic chart.
• Wall cavities left completely hollow in older brick ranches: The 1950s and 60s builders in Terrell Hills, Alamo Heights, and Monte Vista often skipped wall insulation entirely. Homeowners don’t know until the west-facing bedroom never cools. Cavity injection fixes it without a gut renovation.

Pricing for Spray Foam Insulation in San Antonio, TX

We Also Serve Cities Near San Antonio

Our crews work throughout the San Antonio metro every day. If you’re in Universal City, Schertz, Helotes, or Bulverde, call the same number and you’ll get the same written price, the same named technician with a photo badge, and the same 365-Day Done Right Promise. We dispatch from our San Antonio office and cover the surrounding communities without adding travel fees. Contact Spray Foam Insulation in San Antonio and the nearby cities we serve.

FAQs About Spray Foam Insulation in San Antonio