Trusted Crawl Space Encapsulation & Vapor Barrier for Boerne Homeowners
Crawl space encapsulation and vapor barrier installation in Boerne typically runs $3,200-$8,500 for a full encapsulation and $1,800-$3,400 for a standalone vapor barrier, with most jobs completed in 1-3 days. We’re Topside Attic Insulation Boerne, and we’ve sealed and insulated more than 9,000 homes since 2016 - every one starting with a written price and ending with a documented record. If you’re noticing musty smells, sagging insulation, or higher-than-expected cooling bills in your Fair Oaks Ranch or Scenic Oaks home, call us at (830) 529-7780. A live person answers 24/7, and we can usually schedule a free estimate within 48 hours.
What Our Crawl Space Encapsulation & Vapor Barrier Service Includes
Crawl Space Vapor Barrier
A Crawl Space Vapor Barrier is a heavy polyethylene sheet - typically 6-mil or thicker - installed across the dirt floor of your crawl space to block ground moisture from evaporating upward into the structure. In Boerne’s Hill Country clay soils, we’ve found that unsealed crawl space floors can contribute 10-15 gallons of moisture per day during our humid spring months, which is why we specify 10-mil reinforced polyethylene for most Boerne jobs. We seam-seal every overlap and extend the barrier 6-12 inches up the foundation walls, then deliver a Documented Photo Record showing complete coverage before we leave.
Crawl Space Encapsulation
Full encapsulation seals the entire crawl space - floor, walls, and sometimes piers - creating a conditioned, semi-interior space that stops moisture, pests, and outside air from entering. In the limestone-heavy soils around Boerne and Bulverde, we regularly see foundation walls that wick moisture even when the floor looks dry, which is why our encapsulations always include wall sealing as standard, not an upsell. Every encapsulation we complete includes a written scope, a written warranty, and before-and-after humidity readings so you can verify the result.
Crawl Space Insulation
Crawl Space Insulation typically means rigid foam board or closed-cell spray foam applied to foundation walls, or batt insulation in the floor joists - though we rarely recommend floor-joist insulation in encapsulated spaces since the goal is to condition the crawl space, not isolate it. We’ve learned in Leon Valley and Alamo Heights homes that insulating the walls after sealing creates a more stable thermal boundary and eliminates the condensation problems we see when insulation is installed before air sealing. Our crews are trained in both Demilec and Icynene closed-cell applications, and we publish the R-values achieved on every job.
Crawl Space Moisture Control
Moisture control goes beyond the barrier or encapsulation to include drainage improvements, dehumidifier sizing, and ventilation strategy - the complete system that keeps relative humidity below 60% year-round. In Timberwood Park and Lakehills, where homes sit on sloped lots with seasonal runoff, we often install interior French drains or sump pumps as part of the moisture control plan, not as afterthoughts. We measure humidity with calibrated meters at multiple points, and you’ll get those readings in writing, along with the dehumidifier capacity we specified and why.
Crawl Space Cleanout
A cleanout removes deteriorated insulation, pest debris, mold-affected materials, and anything else that’s accumulated before we seal the space - because encapsulating over rot just preserves the problem. We’ve pulled out everything from collapsed fiberglass batts saturated with rodent waste to entire nests of fire ants in Scenic Oaks crawl spaces, and we bag and remove everything rather than pushing it to a corner. The cleanout includes a full photo record of what we found, what we removed, and the condition of the space before we begin any sealing work.
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 Crawl Space Encapsulation & Vapor Barrier
We source our encapsulation materials from established manufacturers including Owens Corning, whose Foamular NGX rigid foam board we use for foundation wall insulation in many Boerne encapsulations - the product carries a long-term R-value of 5 per inch and doesn’t off-gas HFCs during installation. For spray foam applications, we work with both Icynene and Demilec closed-cell formulations, selecting the product based on the specific moisture load and accessibility of your crawl space; Icynene’s MD-R-200, for instance, gives us excellent adhesion to limestone foundations common in the Hill Country.
We also specify GreenFiber loose-fill insulation for certain hybrid crawl space applications where blown-in cellulose provides the right balance of cost and performance in conditioned crawl spaces. Whether your home currently has Owens Corning, Icynene, Demilec, GreenFiber, or any other make of insulation or barrier material, we can assess what’s there, document its condition, and specify the right repair or replacement. We carry no proprietary product lock-in, so our recommendations are based on what performs for your specific foundation type and moisture conditions.
Signs You Need Crawl Space Encapsulation & Vapor Barrier Right Now
- Musty odors inside the home, especially on the first floor. That smell is microbial growth metabolizing organic material in your crawl space, and in Boerne’s warm climate, it doesn’t stay below the floor - it rides stack effect straight into your living space through plumbing and electrical penetrations. If you notice it more in summer when the AC is running, that’s a strong indicator your crawl space is acting as a moisture reservoir.
- Sagging or falling insulation between floor joists. Fiberglass batts lose R-value when they absorb moisture and will eventually detach from the subfloor entirely; we’ve found collapsed insulation in more than half the unencapsulated crawl spaces we inspect in Helotes and Leon Valley. Once it’s on the ground, it’s doing nothing for your energy bills and everything for pest harborage.
- Visible mold or mildew on floor joists or foundation walls. Surface mold on wood indicates sustained relative humidity above 70%, which in a Texas crawl space means the moisture source is active and uncontrolled. We document all fungal growth with photos and can refer you to a remediation specialist if the affected area exceeds what our scope covers - but encapsulation prevents recurrence once the source is addressed.
- Higher cooling bills than comparable homes in your neighborhood. An unsealed crawl space pulls in hot, humid outside air that your HVAC system then works to dehumidify and cool, effectively expanding your conditioned volume by 15-25% with zero insulation benefit. We’ve measured blower-door improvements of 800-1,500 CFM50 after comprehensive crawl space sealing in Castle Hills homes with this exact problem.
- Pest activity or rodent droppings below the home. Moist, undisturbed crawl spaces provide water, shelter, and access points for rodents, snakes, and insects; we regularly find evidence of Norway rats and copperheads in unencapsulated spaces around Boerne’s greener subdivisions. Encapsulation with proper sealing eliminates the habitat and the entry paths, though we may recommend a separate pest control step first if the infestation is active.
Our Crawl Space Encapsulation & Vapor Barrier Process - Step by Step
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On-site assessment and moisture mapping. We start with a full crawl space inspection, measuring humidity at multiple points, identifying water entry paths, and documenting existing insulation condition with photos. In Boerne’s variable soils, we also note foundation wall material - limestone, concrete block, or poured concrete - since each requires different sealing approaches.
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Written price and scope delivered before any work starts. Under Haven Standard Clause 1, you’ll receive a flat price, a written scope of work, and a written warranty before anyone lifts a tool. No verbal estimates, no “we’ll see how it goes” pricing - the number we give you is the number you pay, assuming no hidden conditions emerge that we couldn’t have reasonably detected during inspection.
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Cleanout and preparation. We remove compromised materials, debris, and any pest harborage, then treat the space with a botanical antimicrobial if fungal growth is present. The crawl space is now a clean substrate, and we photograph everything before proceeding.
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Air sealing and moisture barrier installation. We seal all penetrations - plumbing, electrical, HVAC ducts - with appropriate foams and sealants, then install the vapor barrier or full encapsulation system depending on your scope. Seams are overlapped 12 inches and taped; walls are sealed to the barrier with compatible tape or termination bars.
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Verification, documentation, and final walkthrough. We take post-installation humidity readings, deliver your Documented Photo Record, and review the completed work with you. On applicable jobs, we provide before-and-after blower-door numbers showing the air-sealing improvement - a pressurization reading that shows, in one figure, how much conditioned air your home was losing before and after our work.
How Much Does Crawl Space Encapsulation & Vapor Barrier Cost in Boerne?
A standalone vapor barrier installation in a typical Boerne crawl space - roughly 1,000-1,500 square feet with standard accessibility - runs $1,800-$3,400. Crawl Space Encapsulation & Vapor Barrier pricing for full encapsulation with wall sealing, seam-taped barrier, and dehumidifier sizing for the same footprint typically falls between $3,200 and $8,500, with larger or more complex spaces in Fair Oaks Ranch or Scenic Oaks sometimes reaching $12,000 if drainage corrections or sump pump installation is required.
Several factors move the price. Foundation wall height and material matter - limestone walls take more sealant and labor than smooth concrete. Accessibility is significant; we’ve crawled through 18-inch clearances in older Terrell Hills homes and worked in walkable 5-foot spaces in newer Bulverde builds, and the time difference is substantial. Existing damage also affects cost: if we need to remove saturated insulation, address fungal growth, or install a sump pump before encapsulating, that’s additional scope with its own line item in your written price.
To avoid overpaying, get a written scope that specifies mil thickness of the barrier, whether wall sealing is included, and what dehumidifier capacity (if any) is being quoted - we’ve seen competitors quote “encapsulation” that covers only the floor, leaving walls unsealed and the job half-done. Our written price includes every component, and our Free Second Opinion on Any Written Estimate means you can bring us a competing quote and we’ll read it with you, line by line, at no charge.
Every free estimate includes the inspection, moisture readings, photo documentation of current conditions, and a flat written price valid for 30 days. Call (830) 529-7780 to schedule - estimates are free, and there’s no obligation to proceed.
Crawl Space Encapsulation & Vapor Barrier Near Boerne - Our Service Area
We work throughout the northern San Antonio metro, with typical response times of same-day to 48 hours for estimates in Boerne, Crawl Space Encapsulation & Vapor Barrier in Fair Oaks Ranch, Crawl Space Encapsulation & Vapor Barrier in Scenic Oaks, Helotes, Timberwood Park, Lakehills, Bulverde, Leon Valley, Castle Hills, San Antonio, Alamo Heights, and Terrell Hills. Most completed jobs in the Boerne core are scheduled within a week of estimate approval. If you’re unsure whether your address falls in our service area, call (830) 529-7780 - a live person will confirm availability and typical lead time for your location.
Serving Boerne, TX - Our Local Coverage Area
We’re based in the Boerne 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 - Crawl Space Encapsulation & Vapor Barrier in Boerne
Crawl space encapsulation is the process of sealing your entire crawl space - floor, walls, and penetrations - with a heavy vapor barrier and supporting materials to create a dry, conditioned space below your home. A vapor barrier alone is the floor component of that system, blocking ground moisture from evaporating upward. At Topside Attic Insulation Boerne, we assess whether your home needs the full encapsulation or can achieve adequate moisture control with a properly installed vapor barrier plus targeted air sealing - and we put that recommendation in writing with a flat price before any work starts.
Most vapor barrier installations are completed in one day; full encapsulations typically take 1-3 days depending on crawl space size, accessibility, and whether cleanout or drainage work is needed. We’ve completed straightforward 1,200-square-foot encapsulations in Timberwood Park in a single long day, while a 2,500-square-foot space in Fair Oaks Ranch with a sump pump install took three. Your written scope will specify the expected duration before we begin.
Vapor barrier installation runs $1,800-$3,400 for most Boerne homes; full encapsulation ranges from $3,200-$8,500, with complex jobs occasionally reaching $12,000. The final price depends on square footage, wall height and material, accessibility, and whether drainage corrections or dehumidifier installation are required. Call (830) 529-7780 for a free estimate with a flat written price valid for 30 days - and bring us any competing quote for a Free Second Opinion.
Yes - we work with all three brands regularly, specifying Owens Corning Foamular NGX for rigid foam applications, and both Icynene and Demilec closed-cell spray foams depending on the specific moisture load and substrate conditions of your crawl space. We carry no exclusive arrangements with any manufacturer, so our material selection is based on performance for your foundation type, not distributor incentives. If your home already has one of these brands installed, we can assess its condition and specify compatible repairs or upgrades.
We answer calls 24/7 through a live person, not voicemail, and can typically schedule an inspection within 24-48 hours for active water intrusion, post-storm flooding, or other urgent conditions. True emergencies - a burst supply line flooding your crawl space, for instance - may require a plumber first, then we address the encapsulation and moisture control once the source is stopped. Call (830) 529-7780 anytime to discuss urgency and next steps.
All completed work is covered by our 365-Day Done Right Promise - if it’s not done right, we make it right. Additionally, your written warranty specifies coverage periods for materials and labor by component; vapor barrier integrity, for instance, carries different terms than dehumidifier equipment. Both the scope and warranty are delivered in writing before work starts under Haven Standard Clause 1, so you know exactly what’s covered before you commit.
Clear access to the crawl space entrance, remove any stored items you want to keep, and ensure pets are secured during our work hours - that’s usually sufficient. We handle all protective covering of adjacent areas, debris removal, and material staging. If you have an active pest issue, we may recommend a pest control treatment 48-72 hours before we begin, since sealing in live rodents or insects creates problems we can’t solve with encapsulation alone. We’ll note any specific preparation in your written scope if it’s required for your job.
Schedule Your Crawl Space Encapsulation & Vapor Barrier Service in Boerne Today
Call (830) 529-7780 now to speak with a live person and schedule your free estimate. We’ll deliver a flat written price, a detailed scope, and a written warranty before any work starts - and you’ll receive a Documented Photo Record and, on applicable jobs, before-and-after blower-door numbers when we finish. Serving Boerne, Fair Oaks Ranch, Scenic Oaks, and surrounding communities with the Haven Standard since 2016.
Written by Wes Okafor, Owner at Topside Attic Insulation Boerne, serving Boerne and the northern San Antonio metro since 2016.