Trusted Spray Foam Insulation for San Antonio Homeowners
Spray foam insulation in San Antonio typically costs $2,400 – $7,800 for a full attic application, with smaller jobs like rim joists running $900 – $2,100. Most homeowners choose it because it seals air leaks that fiberglass and cellulose simply can’t, which matters a lot when San Antonio summers push attic temperatures past 140°F. Laurel Attic Insulation San Antonio has installed spray foam across Alamo Heights, Leon Valley, Windcrest, and every neighborhood in between since our founding in 2003 as part of the Relay Home Co. family. Chase Whitaker and our crew show up at a live, trackable time, not a four-hour window, and you get a written price before any foam is sprayed. Call (254) 279-0971 and a real person answers, 24/7.
Closed Cell Spray Foam Insulation
Closed Cell Spray Foam Insulation is the denser of the two spray foam types, expanding to about 1 inch thick and hardening into a rigid structure with an R-value of roughly R-6.5 to R-7 per inch. We recommend it for San Antonio homes when you need both insulation and structural reinforcement, or when moisture resistance matters, which it often does in crawl spaces and rim joists where humidity creeps in from the Texas Gulf air. Laurel Attic Insulation San Antonio installs closed cell foam from Icynene and Demilec, matched to the specific job rather than whatever happens to be on the truck that day. Expect closed cell work to run $1.50 – $3.00 per board foot depending on depth, and your written price covers the full scope before we start.
Moisture Barrier Performance
Closed cell foam acts as a Class II vapor retarder at 1.5 inches, which means it blocks the humid air that causes condensation on ductwork and framing. In San Antonio, where summer dew points regularly sit in the 70s, that vapor blocking keeps your attic and crawl space dry through August. We’ve pulled out moldy fiberglass from homes in Scenic Oaks where closed cell would have prevented the problem entirely.
Structural Reinforcement
Because closed cell hardens into a rigid mass, it adds racking strength to walls and roofs, which matters during the high-wind storms that roll through Bexar County each spring. We’ve applied it in garage conversions and bonus rooms where the extra stiffness helped the framing pass inspection. The 365-Day Done Right Promise covers that workmanship in writing for a full year.
Open Cell Spray Foam
Open Cell Spray Foam is the lighter, fluffier option that expands to fill cavities completely, delivering about R-3.5 to R-3.8 per inch while also sealing air movement far better than batt insulation ever will. It’s the right call for most San Antonio attics where the goal is air sealing plus solid thermal performance without the higher material cost of closed cell. Laurel Attic Insulation San Antonio installs open cell foam from Icynene and Demilec, and we’ll give you a straight answer about which foam type fits your budget and your house. Typical open cell attic applications in San Antonio run $2,400 – $5,800 depending on square footage and target R-value.
Air Sealing First
Open cell foam’s real superpower is stopping the stack effect, the way hot air gets pulled into your living space through every gap, crack, and recessed light fixture. A fully sealed attic keeps the air you pay to cool from leaking out through the roofline, which is why homes in Terrell Hills and Castle Hills see immediate comfort changes after installation. We verify coverage with before-and-after photos, delivered to your phone before we leave the driveway.
Sound Dampening
Open cell’s soft, porous structure absorbs sound better than nearly any other insulation material on the market. If you live near Loop 410 or I-10 in Kirby or Live Oak and hear traffic noise bleeding through the attic, open cell spray foam quiets that down significantly. The material fills every void, so there’s no path left for sound waves to travel through.
Spray Foam Insulation Contractors
Spray Foam Insulation Contractors are the licensed and trained professionals who apply expanding polyurethane foam to attics, walls, rim joists, and crawl spaces using specialized high-pressure equipment. You need one when the job requires precise chemical mixing ratios, proper substrate temperatures, and safety protocols that go well beyond rolling out some batts. Laurel Attic Insulation San Antonio operates as the insulation specialist within the Relay Home Co. family, with background-checked, uniformed technicians who arrive at a live arrival time you can track from your phone. Our spray foam work comes with a written price before anything starts and the 365-Day Done Right Promise backing every square foot.
Why Contractor Choice Matters
The difference between a good spray foam job and a bad one is often invisible for six months, until the foam shrinks, cracks, or off-gasses due to improper mixing. We calibrate our equipment for San Antonio’s temperature and humidity conditions on every job, because foam applied too cold or too hot won’t cure correctly. Chase Whitaker personally reviews the job specs before any crew member pulls a trigger.
Relay Visibility Guarantee
Every spray foam project includes the Relay Visibility Guarantee: a written price before work begins, live technician tracking, and photo proof of every completed section. You won’t wonder whether the foam actually reached the far corners of your attic, because you’ll have the pictures on your phone. That’s the standard we’ve operated under since 2003.
Spray Foam Attic Insulation
Spray Foam Attic Insulation means applying foam directly to the underside of your roof deck, sealing the entire attic space and bringing it inside the conditioned envelope of your home. That’s a bigger deal in San Antonio than most people realize, because the standard vented attic with blown fiberglass can hit 150°F in July, baking your ductwork and forcing your AC to work overtime. Laurel Attic Insulation San Antonio installs both open cell and closed cell attic systems from Icynene and Demilec, sized for your square footage and R-value target. Most San Antonio attic spray foam jobs land between $2,400 and $7,800, and your written quote includes everything: prep, spraying, cleanup, and the guarantee.
Conditioned Attic Benefits
When your attic is sealed and insulated at the roofline, the air handler and ducts stop losing conditioned air to a 150°F space. That means your AC runs shorter cycles, your humidity stays lower, and rooms that used to bake on the west side of the house finally match the rest. Homes from Alamo Heights to Lackland AFB have seen electric bill drops in the 20 – 30% range after sealing the attic with foam.
Duct Protection
San Antonio attics are brutal on ductwork, with temperatures that cause seams to separate and insulation to compress over time. A spray foamed attic keeps ducts at a much gentler temperature, which extends their life and stops the leaks that send cooled air into unused space. We inspect the attic deck for any existing damage before spraying so you’re not sealing in a problem.
Spray Foam Wall Insulation
Spray Foam Wall Insulation involves applying foam directly into wall cavities, either during new construction before drywall goes up or through injection into existing closed walls. It’s the most effective way to stop air infiltration through exterior walls, which accounts for a surprising share of energy loss in San Antonio’s older homes. Laurel Attic Insulation San Antonio handles both new-construction wall applications and retrofit injection for homes in Windcrest, Castle Hills, and throughout Bexar County. Budget between $1,800 and $4,500 for a typical exterior wall retrofit, depending on wall count and accessibility.
Retrofit Injection Method
For existing homes, we drill small access holes into each stud bay, inject the foam, then patch and touch up so you’d never know we were there. It’s a clean process that takes one to two days for most single-story homes. The before-and-after photos you get with the Relay Visibility Guarantee show the foam filling each cavity completely.
New Construction Applications
When walls are still open, spray foam gives you continuous insulation with no gaps, no sagging, and no thermal bridging through the studs. Builders in the San Antonio area choose it because it speeds up the insulation phase and delivers a tighter blower door test on the first try. We coordinate with your framing and drywall schedule so the job slots in without delays.
Rim Joist Spray Foam
Rim Joist Spray Foam is the targeted application of closed cell foam to the band board area where your floor framing meets the foundation wall, a spot that leaks air in almost every San Antonio home. It’s a small job that delivers outsized comfort returns, because the rim joist is one of the leakiest parts of a house’s thermal envelope. Laurel Attic Insulation San Antonio applies closed cell foam from Demilec or Icynene to the rim joist area, sealing air leaks and adding insulation in one pass. Budget $900 – $2,100 for a complete rim joist job on a typical two-story San Antonio home.
Why Rim Joists Leak
The rim joist sits between the foundation and the first floor, an area where builders historically stuffed a piece of fiberglass and called it done. That fiberglass does almost nothing to stop air movement, which is why you feel cold floors in January and warm floors in August. Closed cell foam bonds to the wood and the concrete, creating an air seal that fiberglass physically cannot match.
Quick Payback Window
Because rim joist sealing is a smaller job, the payback period is often shorter than a full attic project, especially if you have a crawl space or a basement level. Homes in Converse and Selma with exposed rim joists in the garage see immediate temperature differences in the rooms directly above. We can usually complete a rim joist application in half a day, with photos proving coverage before we leave.
Crawl Space Spray Foam Insulation
Crawl Space Spray Foam Insulation seals the underbelly of your home against the humid air that rises from the ground in San Antonio’s clay soil, stopping moisture, musty smells, and cold floors at the source. Crawl spaces here are notorious for high humidity that leads to sagging fiberglass, mold growth, and wood rot over time. Laurel Attic Insulation San Antonio installs closed cell foam on crawl space walls and rim joists, creating a sealed, conditioned space that stays dry year-round. Typical crawl space encapsulation with spray foam runs $2,800 – $6,200 depending on square footage and access conditions.
Humidity Control
Closed cell spray foam doesn’t absorb water, so it won’t grow mold or lose R-value when crawl space humidity spikes. That’s a real issue in San Antonio, where the ground holds moisture through spring and early summer. Sealing the crawl space with foam keeps that moisture from migrating into your floor framing and eventually into your living space.
Floor Comfort Year-Round
When the crawl space is sealed and insulated, the floor above stops feeling like a refrigerator in winter and a radiator in summer. Homeowners in Scenic Oaks and the Hill Country areas with exposed crawl spaces notice the difference within days. We recommend pairing crawl space foam with a vapor barrier on the floor for the best result, and we’ll include that in your written price if you want it.
Garage Spray Foam Insulation
Garage Spray Foam Insulation seals the garage ceiling and shared walls to stop the garage from acting as a giant heat sink that pulls comfort out of the rest of your San Antonio home. Attached garages routinely hit 120°F in summer, and that heat bleeds into adjacent bedrooms and living spaces through the shared wall and ceiling. Laurel Attic Insulation San Antonio applies open cell foam to garage ceilings and wall cavities, or closed cell where moisture or structural concerns exist. Expect to pay $1,200 – $3,400 for a standard two-car garage ceiling and shared wall, depending on whether the space is finished or exposed.
Shared Wall Problems
Rooms above or next to the garage are often the hottest in the house, even when the AC runs constantly. The shared wall usually has minimal insulation, and the garage ceiling is often bare drywall with nothing stopping the heat from radiating upward. Spray foam fixes both problems at once by filling every cavity completely.
Bonus Room Conversions
If you’re planning to turn the garage into an office, gym, or guest suite, spray foam is the first step before drywall goes up. It gives you conditioned space that actually holds temperature, not a hotbox that fights you every afternoon. We coordinate with your contractor or handle the full insulation scope if you’re doing the conversion yourself.
Brands We Service
We’re factory-trained on Icynene spray foam systems, which we recommend for many San Antonio attics because their open cell formula expands consistently in high heat and humidity. Our crews know the precise temperature windows and mixing ratios that Icynene requires, and we’ve applied their products in everything from small rim joist jobs to full custom-home builds.
Demilec is another brand we carry regularly, and we favor their closed cell products for crawl space and rim joist work where moisture resistance and structural bonding matter most. We’ve completed hundreds of Demilec applications across Bexar County, and we keep their recommended application equipment calibrated for San Antonio’s specific climate conditions. Whether you have Icynene, Demilec, or any other make, we can help.
Signs You Need a Pro Right Now
- Your upstairs rooms won’t cool below 80°F in summer. That’s a sign your attic insulation is failing or missing entirely. Spray foam seals the thermal boundary so your AC stops fighting a losing battle.
- You can feel air moving around outlets and light switches. Air infiltration through exterior walls means your insulation isn’t doing its job. Foam injection stops that airflow at the source.
- Your energy bills jumped 30% or more year over year. Insulation degrades over time, and San Antonio’s heat accelerates the process. A professional assessment will show whether foam is the fix.
- You find moisture or mold in the attic or crawl space. Fiberglass and cellulose absorb water and lose R-value. Closed cell spray foam repels moisture and won’t support mold growth.
- The rooms over your garage are always uncomfortable. Shared walls and garage ceilings with no insulation leak heat constantly. Spray foam seals that envelope and stabilizes those rooms.
Our Process, Step by Step
- 1
Assessment and measurement. We inspect the space, measure square footage, check existing insulation condition, and identify air leaks with a thermal imaging camera. You get a written price for the full scope before anything is scheduled.
- 2
Prep and protection. We mask off the work area, cover surfaces you don’t want touched, and set up ventilation if needed. Existing insulation removal happens here if required.
- 3
Application. Our crew applies the foam at the specified depth, checking temperature and humidity throughout to ensure proper curing. We photograph every section before moving on.
- 4
Verification. We walk the space with you, show you the coverage, and check R-value and depth against the written scope. The photos hit your phone before we’ve loaded the truck.
- 5
Guarantee delivery. You get the written guarantee and digital invoice by link, pay from your phone, and get the free second visit if anything isn’t right within 365 days.
How Much Does Spray Foam Insulation Cost in San Antonio?
Our Service Area Near San Antonio
We serve the entire San Antonio metro, from Alamo Heights and Terrell Hills on the north side to Lackland AFB and the south side, plus Kirby, Live Oak, Castle Hills, and Scenic Oaks. Typical response times run same-day for emergency calls within San Antonio proper and next-day for surrounding communities like Selma and Converse. If you’re in Leon Valley, Windcrest, or anywhere in Bexar County, we’ll be there fast. Check our home page for the full list of services.
Serving San Antonio, TX - Our Local Coverage Area
We’re based in the San Antonio area and know this community well, offering Spray Foam Insulation in San Antonio and nearby areas. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions About Spray Foam Insulation in San Antonio
What is spray foam insulation?
Spray foam insulation is a two-part polyurethane mixture sprayed into cavities that expands on contact to fill the space and harden into an airtight, insulating seal. It’s the only insulation type that both insulates and stops air leakage at the same time, which is why it outperforms fiberglass and cellulose in San Antonio’s extreme heat.
How long does spray foam installation take?
Most attic applications take one day, and rim joist or garage jobs take half a day. Full crawl space encapsulation can run two days depending on access conditions and whether existing insulation needs removal first. We schedule a specific arrival time and track it live, so you’re not waiting around.
How much does spray foam insulation cost in San Antonio?
Spray foam insulation in San Antonio costs $2,400 – $7,800 for a full attic, $900 – $2,100 for rim joists, and $2,800 – $6,200 for crawl space work. Your written price depends on foam type, depth, and square footage. Call (254) 279-0971 for a free estimate with exact numbers for your home.
Do you service Icynene and Demilec products?
Yes, Laurel Attic Insulation San Antonio installs Icynene open cell and Demilec closed cell foam systems, among other leading brands. We’re factory-trained on both product lines and keep our equipment calibrated for San Antonio’s temperature and humidity. We’ll match the foam to your job, not whatever is on the truck.
Can you come out today for an emergency?
Yes, we offer same-day service for urgent spray foam needs in San Antonio, and our phones are answered by a live person 24/7. If you’ve got a failed insulation job, exposed rim joists, or a project deadline that moved up, call (254) 279-0971 and we’ll get a technician out.
What warranty do you provide?
Every spray foam job from Laurel Attic Insulation San Antonio includes the 365-Day Done Right Promise in writing, covering workmanship for a full year. If the foam fails, we fix it. We also offer a free second visit if the repair doesn’t hold, no charge and no argument.
How do I prepare for spray foam installation?
Clear the work area of stored items, move vehicles out of the garage if that space is being foamed, and make sure we have clear access to the attic or crawl space. We handle the rest, including masking, ventilation, and cleanup. You don’t need to do any extensive prep beyond basic clearing.
Schedule Your Spray Foam Insulation Service in San Antonio Today
Get a free estimate from Laurel Attic Insulation San Antonio, led by Chase Whitaker. Call (254) 279-0971 and a real person answers, day or night. You’ll get a written price before anything starts, a live arrival time, and before-and-after photos of every job.
Written by Chase Whitaker, Owner at Laurel Attic Insulation San Antonio, serving San Antonio since 2003.