Trusted Spray Foam Insulation for Boerne Homeowners
If you’re wondering how much Spray Foam Insulation costs, Boerne prices typically run $1.20 to $3.50 per board foot depending on whether you need open-cell or closed-cell, and most residential jobs in the Hill Country run $2,800 to $7,500 for a complete attic or wall system. We’re usually on-site within 24 hours for estimates, and most spray foam installations in Boerne, Fair Oaks Ranch, and Scenic Oaks finish in a single day. Call (830) 529-7780 to schedule a free written estimate with a documented photo record included.
We’ve sealed and insulated more than 9,000 homes since 2016, and every one started with a written price before any work began. Boerne’s combination of hot, humid summers and occasional hard freezes means your building envelope works harder than in milder climates. The limestone substrate and older ranch-style construction in neighborhoods like Old Town Boerne and River Road often hide air leaks at rim joists and top plates that fiberglass alone cannot fix. That’s why we treat air sealing as a hard prerequisite, not an upsell. Our crews complete blower-door testing before and after spray foam installation so you can see the actual performance change, measured in CFM50, not promised in vague terms.
What Our Spray Foam Insulation Service Includes
Open-Cell Spray Foam
Open-cell spray foam is a lightweight, semi-rigid material that expands to fill framing cavities and creates an effective air barrier at R-values around 3.5 per inch. In Boerne’s climate, we typically recommend open-cell for above-grade wall cavities and attic floors where moisture management matters more than structural rigidity. Our crews apply it after sealing all top plates, electrical penetrations, and can light housings, then document the application with photos and post-installation blower-door readings.
Closed-Cell Spray Foam
Closed-cell spray foam is denser, rigid, and delivers R-6 to R-7 per inch while adding structural strength to walls and roof assemblies. We use it in Boerne crawl spaces, basement walls, and any application where bulk water or termite exposure is a concern, because its closed structure resists moisture absorption. Every closed-cell job includes thermal imaging verification to confirm complete coverage at the specified thickness, with readings recorded in your project file.
Rim Joist Spray Foam
The rim joist, where your floor framing meets the foundation, is often the leakiest square footage in a Boerne home, especially in split-levels and hillside construction near Cordillera Ranch. Cold air pours through unsealed rim joists in winter, and humid outside air infiltrates in summer, creating condensation and mold risk. We spray foam rim joists only after manual sealing of all sill plate gaps and penetrations, because foam applied over a leaky boundary will hide the problem without fixing it.
Garage Ceiling Spray Foam
Garage ceilings beneath conditioned rooms are thermal bridges in most Boerne homes built before 2010, with nothing but drywall separating your bedroom from a space that hits 110°F in July. We spray foam garage ceilings to create a continuous thermal and air barrier, which matters particularly in homes with bonus rooms above garages, or for Spray Foam Insulation in Bulverde and surrounding areas. The job includes sealing all duct penetrations and the garage-to-house door frame before foam application.
Spray Foam Roof Deck
Spray foam applied directly to the underside of roof decking creates an unvented, conditioned attic, which is often the best strategy for Boerne homes with complex rooflines, HVAC equipment in the attic, or cathedral ceilings. We use open-cell foam on roof decks in most cases, paired with a vapor-variable interior coating to manage moisture drive during our humid shoulder seasons. The critical step most contractors skip is verifying that the existing roof assembly can dry properly; we assess sheathing condition and ventilation history before recommending this approach.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Brands We Service for Spray Foam Insulation
We source spray foam materials from Icynene and Demilec for most residential applications in Boerne, selecting specific formulations based on the assembly type and moisture risk profile. Icynene’s open-cell products perform consistently in our hot-humid climate, and we’ve tracked their long-term adhesion on limestone substrate homes through multiple summer cycles. Demilec’s closed-cell options offer higher R-value per inch when space is limited, such as in historic Boerne renovations where preserving original plaster thickness matters.
We also work with Owens Corning and GreenFiber systems when a hybrid approach, combining spray foam air sealing with blown-in or batt insulation, better serves the budget or the building. Our technicians are trained on each manufacturer’s specific mixing ratios, temperature requirements, and application thicknesses, because off-ratio foam fails to cure properly and creates odor and performance problems. Whether your existing insulation was installed with Icynene, Demilec, or any other make, we can assess its condition and integrate new work properly.
Signs You Need Spray Foam Insulation Right Now
- Your upstairs rooms stay 8-12°F hotter than downstairs in July. This temperature stratification usually means conditioned air is escaping through leaky attic floor penetrations while hot attic air infiltrates downward. Spray foam creates an air-tight thermal boundary at the roof deck or attic floor, depending on your home’s design.
- You can see daylight around recessed can lights from the attic. Every gap you can see is a pathway for air movement, and in Boerne’s climate that means moisture-laden outdoor air meeting cooled indoor surfaces. We seal these penetrations before adding any insulation, because covering them with blown-in material simply hides the leak.
- Your energy bills spike every August despite moderate thermostat settings. When your HVAC runs constantly but never reaches setpoint, the building envelope is usually the culprit. Our blower-door test pinpoints the leakage rate in CFM50 so you know whether the problem is fixable with air sealing and spray foam or requires additional measures.
- You feel drafts near exterior walls even with windows closed. These drafts often originate at top plates, electrical outlets, and plumbing penetrations that fiberglass batts cannot seal. Spray foam expands to fill irregular cavities and adheres to framing members, eliminating the convection currents that make rooms feel cold in winter.
- Your rim joists show rust on nails or dark staining on wood. These are signs of condensation from humid outside air meeting cool surfaces in your crawl space or basement. Closed-cell spray foam on rim joists raises the surface temperature above the dew point while blocking the air that carries moisture.
Our Spray Foam Insulation Process - Step by Step
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Pre-work blower-door test and thermal imaging. We pressurize your home to measure the baseline air leakage rate in CFM50, then use infrared cameras to map thermal bypasses. This documentation becomes your “before” record and guides our air-sealing priority list.
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Manual air sealing of all accessible leaks. Our crews seal top plates, electrical penetrations, can light housings, duct boots, and rim joist gaps with appropriate materials before any foam enters the space. This step is non-negotiable under The Haven Standard; we have never blown insulation over an unsealed attic floor.
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Spray foam application to specified thickness. Technicians apply open-cell or closed-cell foam at the R-value and thickness documented in your written scope, using real-time thickness gauges and periodic core samples for quality verification. Application temperature and substrate conditions are logged.
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Post-work blower-door test and thermal imaging. We repeat the pressurization test to measure the air leakage reduction and verify with thermal imaging that no gaps or thin spots remain. You receive both sets of numbers in writing.
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Documented Photo Record and written closeout. Before we leave, you get a complete photo set showing pre-work conditions, air-sealing details, foam application, and diagnostic results, plus your written warranty under the 365-Day Done Right Promise. No work is considered complete without this documentation.
How Much Does Spray Foam Insulation Cost in Boerne?
A typical open-cell spray foam installation in a Boerne attic runs $2,800 to $5,200 for a 1,800 to 2,400 square foot home, depending on accessibility and the amount of prep work needed to clear existing insulation. Closed-cell applications, common for crawl spaces and rim joists, run $3.50 to $5.50 per board foot, so a full basement wall system in a Timberwood Park home might range from $4,500 to $8,000. Spray foam insulation in Fair Oaks Ranch and similar Hill Country communities follows comparable pricing, though hillside construction with limited access can add 10-15% for equipment staging.
Several factors move the price: the thickness required to reach target R-value, whether existing insulation must be removed first, the condition of wiring and plumbing that needs protection during application, and whether the roof deck or complex framing requires hand-cutting rather than standard application. We provide a written price before any work starts, always, with a flat number and a detailed scope so you know exactly what you’re paying for. Bring us any competing written estimate and we’ll review it with you at no charge under our Free Second Opinion policy.
What’s included: the pre-work blower-door test, all manual air sealing, spray foam application to specified thickness, post-work verification testing, the Documented Photo Record, and your written warranty. No separate charges for diagnostics, no trip fees, no surprises when the crew finishes. Financing options are available for qualifying homeowners.
Spray Foam Insulation Near Boerne - Our Service Area
We cover Boerne and surrounding Hill Country communities with typical response times of same-day to 24 hours for estimates. Our crews work regularly in Scenic Oaks, Fair Oaks Ranch, Helotes, Timberwood Park, Lakehills, Bulverde, Leon Valley, Castle Hills, and throughout greater San Antonio including Alamo Heights and Terrell Hills. Travel beyond 35 miles from Boerne may require scheduling flexibility, but we never subcontract; every technician is a background-checked, uniformed Envelope Insulation Co. employee.
Serving Boerne, TX - Our Local Coverage Area
We’re based in the Boerne area and know this community well, including our Spray Foam Insulation in Helotes. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions - Spray Foam Insulation in Boerne
Spray foam insulation is a two-component chemical mixture that expands on application to fill cavities and create an air-tight thermal barrier, unlike fiberglass batts which leave gaps and do not stop air movement. The expansion property lets it seal around wires, pipes, and irregular framing that fiberglass cannot address. In Boerne’s climate, this air-sealing capability often matters more than the insulation value itself, because uncontrolled air leakage drives both energy waste and moisture problems.
Most residential spray foam jobs in Boerne finish in one to two days, with attic applications typically completing in a single day and crawl space or full-envelope jobs extending to a second day for proper curing and verification. The foam itself cures within minutes, but we do not rush the post-work blower-door test and thermal imaging that confirm performance. You’ll know the schedule before anyone starts, because Haven Standard Clause 1 requires a written price and written scope in advance.
Open-cell spray foam in Boerne typically runs $1.20 to $1.80 per board foot installed, while closed-cell ranges from $3.00 to $3.50 per board foot, making most whole-home projects fall between $2,800 and $7,500 depending on the areas treated and prep work required. Rim joist-only jobs might run $800 to $1,800, and garage ceiling applications $1,200 to $2,400. Call (830) 529-7780 for a free written estimate with exact numbers for your specific home.
Yes, we install and service both Icynene and Demilec spray foam products, selecting specific formulations based on your home’s moisture risk, framing type, and performance goals. Our technicians maintain manufacturer training on mixing ratios, application temperatures, and cure characteristics for each product line. If your existing foam was installed by another contractor using these or other brands, we can assess its condition and recommend appropriate next steps.
We answer calls 24/7 through a live person, not voicemail, and can typically schedule same-day or next-day service for urgent situations like failed insulation after water damage or pest infestation. True emergencies involving active roof leaks or structural issues may require temporary measures before foam application. Call (830) 529-7780 anytime to discuss your timeline.
All completed spray foam work is covered by our 365-Day Done Right Promise, if it’s not done right, we make it right, backed by a written warranty delivered before any work starts. The warranty covers both material performance and installation quality, with no deductible or service fee for callback visits. Your specific warranty terms are spelled out in the written scope you receive under Haven Standard Clause 1.
Clear attic or crawl space storage items at least 48 hours before the crew arrives, ensure access to electrical panels and water shutoffs, and plan to keep pets and sensitive individuals out of the home for 24 hours after application while the foam fully cures and off-gasses. Our crew will cover floors and protect finished surfaces as part of standard prep. You’ll receive a specific preparation checklist with your written scope once the estimate is approved.
Schedule Your Spray Foam Insulation Service in Boerne Today
Call (830) 529-7780 now to speak with a live person and schedule your free estimate. We’ll provide a written price before any work starts, complete with a detailed scope and your 365-Day Done Right Promise warranty. Every job includes pre- and post-work blower-door testing, a Documented Photo Record, and the documented performance results that show exactly what you paid for.
Written by Wes Okafor, Owner at Topside Attic Insulation Boerne, serving Boerne and the Hill Country since 2016.