Trusted Spray Foam Insulation for Houston Homeowners
Houston summers don’t just test your air conditioner. They test your attic, your walls, and every gap where conditioned air leaks out and humid Gulf air creeps in. Spray foam insulation solves that problem at the source. It’s a two-part liquid that expands on contact and seals gaps airtight, keeping your home cooler in August and warmer during those damp January cold snaps. Woolsey Insulation Houston has installed and serviced our Spray Foam Insulation in Houston across Harris County since 2002, and our crews are in Houston neighborhoods every day of the week. If you’re tired of upstairs rooms that never cool down or electric bills that spike every July, call (903) 447-8369 for a straight answer and a written price.
Key Takeaways
- Spray foam insulation in Houston typically runs $1.50 to $4.50 per square foot depending on the type, location, and job size.
- Closed cell foam handles Houston’s humidity better in crawl spaces and rim joists; open cell is often the smarter buy for attics.
- Every Woolsey job includes a written price before work starts and a 365-day guarantee in writing.
- Phones are answered by a live person 24/7 at (903) 447-8369.
Closed Cell Spray Foam Insulation
Closed Cell Spray Foam Insulation is the denser, harder option that cures into a rigid layer about 1 to 2 inches thick. It has an R-value of roughly 6.5 to 7 per inch, which means even a thin application delivers serious thermal resistance. More importantly for Houston, it acts as a moisture barrier. That matters in crawl spaces under homes in Bellaire, Rosenberg, and La Porte, where standing humidity is a year-round fact of life. We install closed cell foam from Icynene and Demilec, and most closed cell projects in the Houston area run between $2.00 and $4.50 per square foot. The written price we hand you before we start includes every square foot of material, every hour of labor, and the full 365-day guarantee.
When Closed Cell Makes Sense
You want closed cell when the surface is exposed to moisture or needs structural reinforcement. Think rim joists, crawl space walls, and metal buildings. The foam’s density adds shear strength, which is why builders in Sugar Land and Cinco Ranch often spec it for new construction.
What Closed Cell Costs Here
In Houston, closed cell runs higher per square foot than open cell because the material itself is more expensive. A typical rim joist job in League City might run $800 to $1,600. We give you the exact written number before any work begins, so there’s no door-step math lesson.
Open Cell Spray Foam
Open Cell Spray Foam is the lighter, softer foam that expands dramatically on application, often 100 times its liquid volume. It has an R-value of about 3.5 to 3.8 per inch, which is solid, but its real talent is air sealing. It fills every crack, seam, and odd-shaped gap in an attic roofline, which is exactly why it’s the most popular spray foam choice for existing Houston homes. We work with several open cell formulations, including products from Icynene, and most open cell attic jobs in Houston run between $1.50 and $3.00 per square foot of applied area. If your attic has can lights, odd framing, and thirty years of accumulated gaps, open cell is often the right call.
Open Cell in Attics
Houston homes with traditional fiberglass or blown-in attic insulation leak air through the ceiling plane. Open cell applied to the roofline brings the entire attic inside the conditioned envelope. Your upstairs rooms stop being the hottest rooms in the house. Our customers in Deer Park and Cloverleaf notice the difference within a day of the final pass.
Open Cell Limitations
Open cell is not a moisture barrier, which is why we don’t recommend it for ground-contact crawl spaces or exterior foundation walls in Houston’s clay-heavy soils. For those conditions, closed cell is the better material. We’ll tell you which one fits your situation before any money changes hands.
Spray Foam Insulation Contractors
Spray Foam Insulation Contractors are the crews who mix, heat, and apply the two-part foam that seals your home. The difference between a good contractor and a bad one shows up months later in the form of shrunken foam, off-ratio chemical mixes, and gaps the installer hoped you wouldn’t notice. Woolsey Insulation Houston has been sending background-checked, uniformed technicians into Houston attics and crawl spaces for over two decades. Our installers are trained on equipment from the leading spray foam manufacturers, and every job carries a written price before work starts, a committed arrival window, and a 365-day guarantee. If a job isn’t done right, we come back and fix it at no charge. That’s the Kingswell Guarantee in plain words.
What to Look For
Ask any contractor how they handle off-ratio foam. A real pro has a test procedure and a remediation plan. An amateur will blink and change the subject. Ask us. It’s a one-sentence answer, and it tells you everything about how we’re set up.
Our Crews in Houston
Every Woolsey technician who arrives at a Houston home is background-checked and in uniform. You’ll know exactly who is walking through your door, and they’ll leave the job site cleaner than they found it. That’s written into our standard, not a pleasant surprise.
Spray Foam Attic Insulation
Spray Foam Attic Insulation is the highest-impact upgrade most Houston homeowners can make. Your attic is a solar oven in summer. Roof deck temperatures in neighborhoods like New Territory and Galena Park routinely exceed 140°F in July, and that heat radiates downward through whatever insulation currently sits on your attic floor. Spray foam on the roofline stops that heat before it enters the attic at all. The result is an attic that stays within a few degrees of your living space, which makes your upstairs rooms livable and your AC work less. Most spray foam attic jobs in the Houston area run between $3,500 and $9,000 depending on attic size and existing insulation removal. We give you the exact written number before any work starts.
The Houston Attic Problem
Homes in Houston were built for a different climate than the one we now have. The humidity is higher, the summers run longer, and the old rule of thumb about attic ventilation doesn’t hold. Spray foam turns the attic into conditioned space, which is the real fix, not another layer of fiberglass.
Removal Before Application
If your attic has old blown-in insulation, it usually needs to be removed before spray foam goes on the roofline. We’ll include that in the quote and the schedule. You’ll see the number upfront. No hidden line items, no change orders at the door.
Spray Foam Wall Insulation
Spray Foam Wall Insulation is applied inside open wall cavities during remodeling or new construction, and it’s the most complete air-sealing method available for walls. Houston homes built before the current energy codes often have uninsulated or poorly insulated exterior walls. You can feel it when you walk past an exterior wall in August and it radiates heat like a radiator. We install open cell and closed cell in wall cavities across Houston, from older single-story homes in Deer Park to new builds in Cinco Ranch. Wall applications in Houston typically run $2.00 to $4.00 per square foot of wall area. The exact number is in your written quote before we begin.
Existing Walls
For existing homes, wall spray foam usually requires an open cavity from a remodel or new construction. We can’t inject foam through a pinhole and expect it to fill a closed wall correctly. If you’re opening walls for a kitchen or bath remodel, that’s the perfect time to add spray foam while the cavities are exposed.
New Construction in Houston
Builders in Sugar Land, League City, and the growing areas west of Houston increasingly spec spray foam in exterior walls. We work with builders and with individual homeowners during the framing phase. The material we recommend depends on your wall assembly and the exposure side of the house.
Rim Joist Spray Foam
Rim Joist Spray Foam is the targeted application of closed cell foam along the band board where your first-floor framing meets the foundation. This is one of the most affordable and highest-return insulation jobs you can do in a Houston home. The rim joist area is a notorious air leak point in older houses, and it’s also where moisture from the crawl space rises into your floor system. Closed cell spray foam seals the air leaks and blocks the moisture in one pass. Most rim joist jobs in Houston run between $800 and $1,800 depending on home size and access. We’ll give you the written number after a quick look at your foundation line.
Why the Rim Joist Leaks
Builders in the Houston area traditionally stuffed fiberglass batts into rim joist bays, which does almost nothing to stop air movement. The result is humid crawl space air pulled into the house all summer. Spray foam fixes the leak the way a gasket fixes a flange: it seals the entire perimeter.
Fast Job, Big Impact
Rim joist work is usually a one-day job. Homeowners in La Porte and Rosenberg consistently tell us they feel the difference in the floors within a week. Cold floors in January are a rim joist problem. Spray foam is the answer.
Crawl Space Spray Foam Insulation
Crawl Space Spray Foam Insulation addresses the damp, dark space under your house. In Houston, crawl spaces are humidity traps. The soil under your home releases moisture, and that moisture rises into your floor system and eventually into your living space. Closed cell spray foam, applied to crawl space walls and rim joists, creates a continuous air and moisture barrier that stops the problem at the source. Most crawl space insulation jobs in Houston run between $1,800 and $5,000 depending on square footage and access conditions. We inspect every crawl space before quoting, and we’ll show you exactly where the foam goes and why.
Closed Cell in Wet Spaces
We use closed cell exclusively for ground-contact crawl space work. Open cell absorbs moisture, and in a Houston crawl space, that means a foam job that turns into a sponge. Closed cell is denser, repels water, and keeps doing its job in high humidity.
What We See Down There
Crawl spaces in older Houston homes are often unpleasant surprises: standing water, mold on the joists, chewed wiring. We’ll tell you what we find before we quote, and we’ll never sell you foam over a water problem that needs drainage work first. Honesty before a sale is the Woolsey way.
Garage Spray Foam Insulation
Garage Spray Foam Insulation turns an unconditioned garage into a usable space. In Houston, garages bake. The single-layer garage door, the uninsulated walls, the ceiling that opens into a hot attic, all combine to make your garage the hottest room on the property. Spray foam on the garage ceiling and shared walls with the house makes a measurable difference in both garage temperature and the efficiency of your home’s conditioned envelope. Most garage insulation jobs in Houston run between $1,200 and $3,500 depending on whether we’re doing the ceiling, the walls, or both. We’ll give you a written price after we measure, and the number won’t change at the door.
Shared Walls Matter
If your garage shares a wall with the living room or a bedroom, that wall is an uninsulated thermal bridge straight into your home. Sealing and foaming that wall is one of the simplest upgrades we do, and it usually pays for itself faster than any other single room project.
Garage Ceilings
Garage ceilings often have no insulation at all, which means your garage is heated by the attic above. Open cell spray foam on the ceiling is the straightforward fix. If you have a finished room above the garage, that’s actually a floor insulation issue, and we’ll address it correctly when we quote.
Brands We Service
Our crews install and service spray foam materials from Icynene, Demilec, Knauf, and CertainTeed, among others. Icynene open cell is a long-time favorite for Houston attic applications because of its expansion characteristics and air sealing performance. We have years of hands-on experience dialing in the right temperature and pressure for Icynene’s lighter formulations, which matters when you’re spraying a roofline in 95-degree Houston heat.
Demilec closed cell is our go-to for crawl spaces and rim joists where moisture resistance is non-negotiable. Knauf and CertainTeed products appear frequently in our wall cavity work, especially in new construction and remodeling projects around the greater Houston area. Whether you have Icynene, Demilec, Knauf, CertainTeed, or any other spray foam material in your home, we can help with repairs, additions, or a full reapplication.
Signs You Need a Pro Right Now
- Upstairs rooms run 8 to 12 degrees hotter than downstairs. That’s a classic Houston attic insulation failure. The heat load from the roof is overwhelming whatever insulation is up there. Spray foam on the roofline is the fix that actually works.
- Electric bills spike every summer and never seem to recover. Your AC is fighting a losing battle against a hot attic and leaky walls. Sealing the thermal envelope with spray foam reduces that load permanently.
- You can feel cold drafts through the floors in winter. Rim joist leaks and uninsulated floor systems pull cold air into the house. January in Houston may be short, but it’s cold enough to expose the gaps.
- Your crawl space smells musty and the floors are warping. Moisture is moving upward through the floor system. Closed cell spray foam on crawl space walls and rim joists cuts that off at the source.
- Pest droppings or chewed insulation in the attic. Rodents love fiberglass and blown-in insulation as nesting material. Spray foam is resistant to pest damage and seals the entry gaps they use. We’ll tell you what we see and what it will take to fix it.
Our Process, Step by Step
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Call and talk to a person. When you call (903) 447-8369, a live person answers. Not a recording, not a call-back request. We listen to what you’re dealing with and schedule a walkthrough at a time that works for you.
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The walkthrough. A Woolsey technician arrives at your Houston home at the committed time. They inspect the attic, crawl space, walls, or garage, take measurements with a thermal camera and moisture meter, and identify exactly what’s failing.
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The written quote. Before any work begins, you get a written price. Every square foot of foam, every hour of labor, every material, and the full 365-day guarantee in writing. The number on that page is the number you pay.
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The installation. Our uniformed, background-checked crew arrives on schedule and gets to work. We mask and protect the work area, apply the foam to manufacturer specs, and clean up every scrap before we leave. Your job site will be cleaner than we found it.
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The follow-through. Every job includes a written guarantee covering the work for 365 days. If anything isn’t right, call us. We come back and fix it at no charge. That’s the Kingswell Guarantee, and it’s been our standard since 2002.
How Much Does Spray Foam Insulation Cost in Houston?
A typical spray foam attic insulation job in Houston runs between $3,500 and $9,000 depending on attic size, accessibility, and whether old insulation needs removal first. Closed cell rim joist jobs typically run $800 to $1,800. Crawl space applications usually land between $1,800 and $5,000. Open cell attic foam averages $1.50 to $3.00 per square foot of applied area, while closed cell runs $2.00 to $4.50 per square foot. These are the ranges we see across Harris County every week, from Bellaire to Deer Park to Rosenberg, and you can read more about how much Spray Foam Insulation costs on our dedicated pricing page.
What affects the price? The size of the area, the type of foam, the condition of the existing insulation, and how easy the space is to access. A tight attic with low clearance takes more labor than a wide-open one. A crawl space with standing water needs drainage work before foam makes sense. We’ll show you exactly what goes into your number before you commit. The best way to avoid overpaying is to get a written price you can hold someone to. Our free estimate is exactly that: a written, itemized price, delivered before any work starts, and it doesn’t change at the door.
Our Service Area Near Houston
Woolsey Insulation Houston works throughout the greater Houston metro, including home insulation projects in Sugar Land, League City, Rosenberg, La Porte, Deer Park, Cloverleaf, Cinco Ranch, Bellaire, and New Territory. We also provide Spray Foam Insulation in Houston and regularly serve homeowners in Spring and Humble. Most Houston-area homes can be scheduled for a walkthrough within a few business days, and emergency insulation failures get same-day attention when our schedule allows.
Serving Houston, TX - Our Local Coverage Area
We’re based in the Houston area and know this community well. 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 Houston
Spray foam insulation is a two-part liquid that expands on contact and seals gaps airtight, creating a continuous thermal and air barrier in attics, walls, crawl spaces, and rim joists. It comes in open cell and closed cell formulations, each suited to different parts of a Houston home. We explain the difference during your walkthrough and recommend the material that fits your specific condition.
Most attic spray foam jobs in Houston are completed in one to two days. Rim joist work is usually a single-day job, and crawl spaces take one to two days depending on access. We’ll give you a committed arrival window and a firm completion estimate in your written quote before any work starts.
Open cell attic foam typically runs $1.50 to $3.00 per square foot, while closed cell runs $2.00 to $4.50 per square foot depending on the application. A full attic job usually lands between $3,500 and $9,000. Call (903) 447-8369 for an exact written quote, estimates are free.
Yes. We install and service Icynene open cell foam regularly, along with Demilec, Knauf, and CertainTeed products. If you have an existing Icynene installation that’s failing, delaminating, or shrinking, we can assess it and recommend a repair or reapplication plan.
We answer our phones live 24 hours a day, 7 days a week. If you have a sudden insulation failure, a major air leak, or storm damage that’s exposing your home’s thermal envelope, call (903) 447-8369 and you’ll talk to a real person who can get a crew scheduled.
Every job includes the Kingswell Guarantee: a written price before work starts, a committed arrival window, a clean job site, a written guarantee on the work, and a free return visit if any repair fails within 365 days. That’s in writing on every single job.
For attic work, remove any items you want to keep from the attic space and make sure the attic access is clear. For crawl space and garage work, clear the area around the access points. Our crew handles site protection and cleanup. We’ll give you a simple prep checklist when you schedule.
Schedule Your Spray Foam Insulation Service in Houston Today
If you’re tired of hot upstairs rooms, high summer electric bills, or a crawl space that makes the whole house feel damp, call Woolsey Insulation Houston at (903) 447-8369. A live person answers 24/7, and every estimate is free with no obligation. You’ll get a written price before any work starts and a 365-day guarantee in writing. That’s the Kingswell Way.
Written by Glenn Hartley, Owner at Woolsey Insulation Houston, serving Houston since 2002.