Fast, Reliable Spray Foam Insulation Across Houston
Spray foam insulation in Houston typically costs between $1.80 and $4.50 per board foot for open-cell and $2.50 to $7.00 per board foot for closed-cell, with most whole-attic jobs landing between $4,500 and $12,000 depending on square footage and foam depth. We give you the exact written number before any work starts. Our crews know Houston’s housing stock intimately, from Braeswood ranch homes with original 1970s batts to Sharpstown builds where squirrels have made a mess of things. Call (903) 447-8369 and a live person answers, 24/7, no voicemail maze.
Woolsey Insulation Houston installs and services attic insulation and Spray Foam Insulation only. That focus means we’ve seen nearly every framing style, existing insulation depth, and moisture problem Harris County can throw at a home. The Kingswell Guarantee backs every job: a written price before work starts, a committed arrival window, a clean job site, and a written guarantee. If something isn’t right within 365 days, we come back and fix it. No charge, no argument, in writing.
- Written price before any work begins, every job, no exceptions
- 365-Day Done Right Promise: if it fails within a year, we fix it free
- Background-checked, uniformed technicians on every visit
- Live person answers the phone 24/7 at (903) 447-8369
Why Woolsey Insulation Houston Is Houston’s Preferred Spray Foam Insulation Company
Houston homeowners call us because we answer the phone and we show up when we say we will. That sounds basic, but in this trade it’s rarer than it should be. Our customers around Bellaire, Humble, and Deer Park tell us the same story: another contractor quoted one number over the phone, then “found” problems on site and changed the price at the door. The Kingswell Way removes that entirely. We walk the attic, we measure, we write the price down, and that number doesn’t move unless you change the scope.
Glenn Hartley leads our Houston team with a simple standard: say the price, show up in the window, leave the job site cleaner than you found it, put the guarantee in writing. Every technician is background-checked and uniformed, so you know exactly who is walking into your home. We work with eight leading insulation brands, including CertainTeed, Icynene, and Demilec, which means we recommend the material that fits your home’s framing, humidity exposure, and budget, not whatever happens to be on the truck that morning.
Woolsey has been part of the Kingswell family of independently owned and operated insulation companies since 2002. We are not a national chain or a franchise. This Houston location serves Houston locally, with dispatch and scheduling coordinated from our Houston office. That local presence means response times measured in hours, not days, when you need rim joist work in Galena Park or a full attic retrofit in Meyerland.
Rim Joist Spray Foam in Houston
Rim joist spray foam in Houston is one of the highest-return insulation jobs we do, especially in 1970s and 1980s suburban homes around Westbury and Spring Branch where the original fiberglass batts in the rim joist bays have sagged or been pulled apart by rodents. The job involves sealing the narrow band where your floor framing meets the foundation wall. Closed-cell foam is applied to each joist bay, creating an airtight, moisture-resistant barrier that stops outside air from entering the crawl space and conditioned air from escaping. Most rim joist jobs in Houston run between $1,800 and $3,400 for a typical 2,000-square-foot home, and we’ll give you the exact figure in writing before the first can of foam is opened.
Why Rim Joists Fail in Houston’s Humidity
Houston’s subtropical air pushes moisture against the rim joist framing year-round. Once fiberglass batts get damp, they lose R-value and become a welcome mat for mold. Closed-cell spray foam doesn’t just insulate; it acts as a vapor barrier, which is why we reach for it in humid crawl spaces and rim joist applications throughout the Houston area.
What to Expect During the Job
We typically finish a rim joist application in half a day. The crew arrives in the committed window, protects the work area, removes the old degraded batts if needed, and applies foam to the specified depth. The guarantee is in your hand before the crew pulls out of the driveway.
Crawl Space Spray Foam Insulation in Houston
Crawl space spray foam insulation in Houston addresses one of the most overlooked sources of home discomfort: the damp, hot air that rises from an unsealed crawl space into your living areas all summer. Many Houston homes in neighborhoods like Oak Forest and Garden Oaks sit over vented crawl spaces that draw in humid outdoor air every day. We spray closed-cell foam on the crawl space walls and rim joists, sealing the space and keeping ground moisture where it belongs. A typical crawl space encapsulation with spray foam in Houston runs $5,000 to $12,000, depending on square footage and access. You’ll have the written price before any work begins, guaranteed.
Heat, Moisture, and Your Floors
When humid air enters a vented crawl space, it condenses on cooler surfaces, including your subfloor and ductwork. Homeowners notice warped hardwood, clammy carpet, and a musty smell that no amount of air freshener fixes. Spray foam stops this cycle at the source, making the space below your home cleaner, drier, and dramatically more energy efficient during Houston’s long cooling season.
Closed-Cell vs. Open-Cell Below the House
We almost always recommend closed-cell foam for Houston crawl spaces because it acts as both an air barrier and a vapor barrier. Open-cell is a fine product for certain attic applications, but below the house, where moisture drives the problem, closed-cell from brands like Demilec or Icynene is the honest recommendation. We’ll explain the difference in plain language and let you decide from there.
Trusted Brands We Service in Houston
Woolsey works with eight leading insulation manufacturers so the material fits the job, not the truck. In Houston’s climate, we lean heavily on closed-cell products from Demilec and Icynene for humid crawl spaces and rim joists, and CertainTeed’s open-cell line for attic rooflines where vapor permeability is desirable. We keep a deep stock of local inventory for Houston customers, which means fewer delays when you’re waiting on a rim joist job in Galena Park or a full attic retrofit in Bellaire. If a product is on backorder nationally, having relationships with eight brands gives us alternatives most single-brand shops simply don’t have.
Common Spray Foam Insulation Problems We See in Houston Homes
- Open-cell foam installed without proper vapor control. In Houston’s humid attics, open-cell can absorb moisture from the air, gradually losing R-value and encouraging mold on the roof decking. We account for this on every attic job, choosing the right foam type for your specific roof assembly and ventilation setup.
- Spray foam applied over old, damp fiberglass. Homes built in the 1960s through 1980s around Sharpstown and Braeswood often have original batts that have been wet at some point. If spray foam is applied directly over that material, moisture gets trapped against the ceiling drywall, leading to sagging, staining, or worse. We remove contaminated or damp material before applying foam.
- Misjudged framing depth on unpermitted additions. Houston’s lack of zoning means plenty of homes have additions built without permits, with unpredictable framing depths and spacing. A crew that doesn’t catch this misses rim joist coverage, leaving persistent air leaks and cold spots. Our crews measure every bay before spraying.
- Compacted insulation and pest tunnels. In older Houston neighborhoods, original blown-in insulation often settles under four inches after decades of humidity, and raccoons or squirrels tunnel through it to nest. The result is bare spots directly over bedrooms, and an AC system that runs nonstop in August. We see this constantly and fix it by removing the contaminated material, air-sealing, and spraying foam at the proper depth.
Pricing for Spray Foam Insulation in Houston, TX
Here’s what you can expect to pay for spray foam work in the Houston market. Open-cell attic spray foam typically runs $3,500 to $7,500 for a 1,500-square-foot attic at standard depth. Closed-cell roofline applications, which we recommend for many Houston homes because of their superior vapor control, land between $7,000 and $14,000 for the same size. Rim joist jobs run $1,800 to $3,400, and crawl space work generally falls between $5,000 and $12,000. What moves the number? Attic access difficulty, existing insulation that must be removed, framing depth, and foam thickness. We measure everything, write the exact price down, and hand it to you before any work starts. Call (903) 447-8369 for a free estimate with real dollar figures, not vague promises.
We Also Serve Cities Near Houston
Our Houston crews work throughout the metro area, including Galena Park, Bellaire, Humble, and Deer Park. If you live in any of these communities, you’ll get the same written price, the same arrival window, and the same 365-day guarantee. Houston is our home base, but the Kingswell Way travels to every job we take.
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.
FAQs About Spray Foam Insulation in Houston
Houston’s humidity means you need to choose the right foam type for your attic. Open-cell foam is vapor-permeable, which means it can absorb moisture from humid air if your attic isn’t properly ventilated. Over time, that moisture reduces the foam’s R-value and can lead to mold on the roof decking. In many Houston homes, closed-cell foam applied to the roofline is the better choice because it blocks moisture by design. Call (903) 447-8369 and we’ll assess your specific attic before recommending anything.
Yes, and this is one of the most common calls we get. Rooms over garages in 1970s Sharpstown homes usually sit above an unconditioned garage with little or no insulation in the floor cavity. We apply closed-cell spray foam to the garage ceiling and rim joist areas, sealing the room from the heat rising off the garage slab. After the job, most homeowners see that room hold temperature within three or four degrees of the rest of the house. Call us for a written quote on your specific garage ceiling.
Usually yes, and here’s why. If the existing fiberglass is damp, compacted, or contaminated with pest waste, which is common in Houston’s 1960s to 1980s housing stock, spraying foam over it traps that moisture against your ceiling drywall. That leads to staining, sagging, and mold. We remove the old material, inspect the ceiling for any water damage, air-seal the top plates, and then apply the foam. The removal cost is included in your written estimate, never tacked on later.
Yes, when installed correctly. Houston’s lack of zoning means building codes apply to individual structures, not neighborhoods, but Harris County amendments do govern insulation requirements for new work and retrofits. Our crews know these amendments and install foam to meet or exceed them, including proper ignition barrier requirements in attics that remain unfinished. Your written guarantee covers code compliance on every job we do in Houston.
Spray foam in a crawl space seals out the humid outdoor air that causes most of Houston’s crawl space problems. Closed-cell foam applied to the crawl space walls and rim joists creates an air and vapor barrier, keeping ground moisture out and conditioned air in. Homeowners typically notice drier floors, less musty odor, and lower cooling bills within the first month. For an exact price on your crawl space, call (903) 447-8369, and a live person will answer.
Written by Glenn Hartley, Owner at Woolsey Insulation Houston, serving Houston since 2002.