Trusted Crawl Space Encapsulation & Vapor Barrier for New Braunfels Homeowners
Crawl Space Encapsulation & Vapor Barrier pricing in New Braunfels typically runs $3,200-$7,800 for a full system with vapor barrier, depending on square footage and whether the foundation needs drainage correction. Most jobs we complete in Comal and Guadalupe counties take two to four days, and we can usually start within a week of your written estimate. Call (830) 243-6352 for a free assessment with a written price before any work starts.
We’ve sealed and insulated more than 9,000 homes since 2016, and crawl spaces in this part of Texas keep us busy year-round. The Hill Country’s clay soils shift with seasonal moisture, and that movement cracks foundation vents and separates vapor barriers that were never properly sealed to begin with. In neighborhoods like River Chase, Vintage Oaks, and the older sections of downtown New Braunfels, we regularly find fiberglass batt insulation hanging wet from floor joists, mold on rim joists, and relative humidity readings above 70% - conditions that rot structural members and pull conditioned air straight out of the living space.
Wes Okafor and our crew treat every crawl space as part of the building envelope, not a separate zone. We don’t install new insulation over wet, unsealed ground. The Haven Standard requires air sealing and moisture control first, then insulation, in that order. Every job closes with a Documented Photo Record and, where applicable, before-and-after blower-door numbers so you can verify the performance change.
What Our Crawl Space Encapsulation & Vapor Barrier Service Includes
Crawl Space Vapor Barrier
A Crawl Space Vapor Barrier is a heavy polyethylene sheet, typically 10-20 mil, that blocks ground moisture from evaporating into your crawl space air. In New Braunfels, where the water table sits close to surface level in areas along the Guadalupe River and its tributaries, bare earth can pump gallons of water vapor upward daily. We install vapor barriers with sealed seams and perimeter attachment to the foundation walls, not just loosely laid plastic. For homes in Canyon Lake Estates or along the river corridor, we often specify 20-mil reinforced liner with a woven core that won’t tear on our rocky Hill Country soils.
Crawl Space Encapsulation
Encapsulation is the complete sealing of your crawl space from outside air and soil moisture - vapor barrier on the floor, sealed foundation vents, insulated walls, and a dehumidifier or conditioned-air supply to maintain controlled humidity. In New Braunfels, building codes still permit vented crawl spaces in many jurisdictions, but we’ve measured enough summer humidity at 85%+ to know vents pull hot, wet air in faster than they ever exhaust it. Our encapsulation includes taping all vapor barrier seams with manufacturer-specified tape, sealing rim joists with closed-cell spray foam or rigid foam board, and installing a commercial-grade dehumidifier sized to the space. We use materials from Owens Corning and Johns Manville for wall insulation, selected by application, not by brand loyalty.
Crawl Space Insulation
Once moisture is controlled, we install Crawl Space Insulation. For encapsulated crawl spaces, we typically install rigid foam board or closed-cell spray foam on foundation walls, leaving the floor joists uninsulated so the crawl space becomes a conditioned semi-basement. For vented crawl spaces that can’t be fully encapsulated due to budget or access constraints, we install fiberglass-free insulation between joists - Rockwool or mineral wool batts that won’t support mold growth if moisture returns. In older homes near Gruene or the original New Braunfels plat, we often find compressed, fallen fiberglass that’s been wet for years; we remove it, sanitize the space, and start fresh with materials appropriate to the new moisture conditions.
Crawl Space Moisture Control
Moisture control is the active management of humidity after passive sealing is complete. This means a properly sized dehumidifier, drainage improvements if water pools against foundation walls, and sometimes a sump pump in low-lying areas. In New Braunfels, homes in the 78130 zip code often sit on sloping lots where surface water drains toward the foundation; we address this with grading recommendations and, where needed, interior perimeter drains before encapsulation. We monitor with digital hygrometers left in place for 48 hours post-installation to confirm the system holds below 60% relative humidity, the threshold where mold growth slows dramatically.
Crawl Space Cleanout
Cleanout is the removal of debris, failed insulation, pest droppings, and contaminated vapor barrier before any new work begins. It’s labor-intensive and unglamorous, but skipping it traps existing mold spores and pest pheromones under your new encapsulation. In New Braunfels, we regularly pull out decades of fallen fiberglass, rodent nesting material, and the occasional abandoned HVAC duct. We bag and remove everything, then apply an EPA-registered antimicrobial to exposed framing before the new system goes in. The Documented Photo Record starts here, so you see what was there before we covered it.
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 materials from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber - no proprietary product lock-in that limits our options to one manufacturer’s system. Owens Corning’s Foamular NGX rigid foam board is our usual choice for foundation wall insulation in encapsulated crawl spaces; we’ve installed thousands of board feet in Comal County homes and appreciate its consistent R-value and moisture resistance in our humid climate. For spray foam applications, Demilec’s Heatlok HFO High Lift gives us the closed-cell density we need for rim joist sealing without the higher global-warming-potential blowing agents of older formulations.
Johns Manville mineral wool batts serve our vented-crawl-space jobs where we need fire resistance and moisture tolerance in one product. Whether your existing system used one of these brands or another make entirely, we can match or improve the specification. Bring us a competing quote - under Haven Standard, we provide a Free Second Opinion on any written estimate, reading it with you line by line.
Before
AfterSigns You Need Crawl Space Encapsulation & Vapor Barrier Right Now
- Musty odors rising from floor registers or gaps in flooring. That smell is microbial volatile organic compounds - metabolites from mold and bacteria growing on wet wood or insulation. In New Braunfels, we trace this most often to crawl spaces with failed vapor barriers and summer humidity above 80%. The odor means active growth, not just old moisture, and it will worsen as temperatures climb.
- Sagging or fallen insulation between floor joists. Fiberglass batt loses R-value when compressed and becomes a moisture sponge when the facing fails. We see this in homes throughout River Chase, Solms Ranch, and other 2000s-era subdivisions where builders stapled Kraft-faced batts to joists without air sealing. Once it falls, it’s doing nothing for your energy bill and everything for your mold spore count.
- Cupped hardwood floors or warped laminate. Wood flooring absorbs moisture from below when crawl space humidity climbs above 65% for extended periods. The boards expand across their width, then crown or cup as they dry unevenly. In New Braunfels, this pattern peaks in September and October after four months of summer humidity loading - right when homeowners assume the danger has passed.
- Insect or rodent activity concentrated at foundation vents. Open vents are highways for Texas pests: carpenter ants, subterranean termites, roof rats, and the occasional snake seeking cool ground. Encapsulation with sealed vents and proper door sweeps closes these entry points. We coordinate with pest control professionals when active infestations need addressing first.
- HVAC system running longer than neighbors’ homes or failing to hold setpoint. Ductwork in a vented crawl space loses 15-25% of conditioned air to infiltration and conduction, by Department of Energy estimates. In New Braunfels, where summer design temperatures hit 99°F, that means your air handler works overtime pulling 85°F wet air across leaky return plenums. We measure this with blower-door and duct-blaster testing before quoting any encapsulation.
Our Crawl Space Encapsulation & Vapor Barrier Process - Step by Step
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Assessment and written estimate. We inspect your crawl space with full PPE and lighting, documenting existing conditions with dated photographs. We measure square footage, note access constraints, test humidity with a calibrated thermo-hygrometer, and identify standing water or active leaks. You receive a written price with scope, materials list, and warranty terms before any work is scheduled - Haven Standard Clause 1, no exceptions.
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Cleanout and preparation. Our crew removes all failed insulation, debris, and existing vapor barrier, bagging for off-site disposal. We treat exposed framing with antimicrobial where mold staining is present, then allow drying time. Foundation vents are sealed with rigid foam board and exterior-grade caulk; we never stuff fiberglass into vent openings, a shortcut we see too often in New Braunfels.
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Moisture management installation. We grade the earth floor for drainage, install perimeter drains or sump pumps where needed, and lay the vapor barrier with sealed seams and wall terminations per manufacturer specification. For full encapsulation, we extend the barrier 6-12 inches up foundation walls, sealing with compatible tape or termination bars. A commercial dehumidifier is sized to the space using ASHRAE guidelines, not rule-of-thumb.
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Air sealing and insulation. Rim joists, sill plates, and penetrations are sealed with closed-cell spray foam or two-part foam from Demilec or equivalent. Foundation walls receive rigid foam board or batt insulation selected for the application. We pressure-test with a blower door where the building envelope allows, documenting CFM50 reduction when the crawl space is integrated into conditioned space.
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Verification and documentation. We leave digital hygrometers recording for 48 hours minimum, then return to verify humidity holds below 60%. You receive the Documented Photo Record, written warranty, and any blower-door readings. The 365-Day Done Right Promise begins at final walkthrough - if humidity climbs or materials fail, we make it right.
How Much Does Crawl Space Encapsulation & Vapor Barrier Cost in New Braunfels?
A typical vapor barrier installation in New Braunfels runs $1,800-$3,400 for an average 1,200-square-foot crawl space with good access and no drainage issues. Full encapsulation with dehumidification usually falls between $4,200 and $7,800, with larger homes in Vintage Oaks or River Chase sometimes reaching $9,500 for complex perimeter drainage and multiple access points. Crawl space insulation alone, when done after proper moisture control, ranges $1,200-$2,800 depending on material and R-value.
Several factors push these numbers up or down. Access height matters: less than 18 inches of clearance requires specialized equipment and slower work. Standing water or hydrostatic pressure against walls means drainage correction before encapsulation, adding $800-$2,500. Existing mold remediation, if needed, is quoted separately based on square footage of affected materials. And the condition of your HVAC ductwork - whether it can be left in place or needs replacement after years in a wet crawl space - may affect the total scope.
What you receive for that price: all materials, labor, disposal, the dehumidifier (on encapsulation jobs), and the full documentation package. No line-item surprises. To avoid overpaying, get multiple written estimates and compare scope, not just bottom-line numbers. A quote that omits dehumidification for a full encapsulation, or specifies 6-mil homeowner-grade plastic instead of reinforced 12-mil or 20-mil liner, is not comparable. We provide a Free Second Opinion on any written estimate - bring us a competitor’s scope and we’ll read it with you.
Our estimates are free and carry no obligation. Call (830) 243-6352 to schedule.
Crawl Space Encapsulation & Vapor Barrier Near New Braunfels - Our Service Area
We work throughout Comal, Guadalupe, and northern Bexar counties, with typical drive times under 30 minutes to Crawl Space Encapsulation & Vapor Barrier in Cibolo, Crawl Space Encapsulation & Vapor Barrier in Seguin, Schertz, Selma, Universal City, and Live Oak. Canyon Lake and Bulverde homes add 15-20 minutes for the Hill Country roads. Converse, Windcrest, and Timberwood Park round out our Bexar County coverage. Response to emergency moisture issues - flooded crawl spaces, failed sump pumps, burst supply lines - is same-day when you call before noon. Routine assessments are typically scheduled within three to five business days.
Climate conditions vary across this service area. Homes near Canyon Lake sit at higher elevation with thinner soils and better natural drainage; homes in the Cibolo and Schertz clay plains hold water against foundations longer after rain. We adjust our drainage recommendations accordingly, and our material specs account for the freeze-thaw cycling that hits Bulverde and Timberwood Park harder than river-level New Braunfels.
Serving New Braunfels, TX - Our Local Coverage Area
We’re based in the New Braunfels 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 New Braunfels
Crawl space encapsulation is the complete sealing of your crawl space from outside air and soil moisture using a heavy vapor barrier on the floor, sealed foundation vents, insulated walls, and mechanical dehumidification. A vapor barrier alone blocks ground moisture evaporation but does not seal the space from humid outside air. In New Braunfels, we recommend full Crawl Space Encapsulation & Vapor Barrier in New Braunfels for homes with HVAC ductwork in the crawl space, and vapor barrier with improved ventilation for simpler applications where budget is constrained.
Most encapsulation projects in New Braunfels take two to four days, with an additional 48 hours of humidity monitoring after completion. Cleanout-heavy jobs, or those requiring drainage correction and sump pump installation, may extend to a full week. We schedule start dates only after materials are on hand and weather permits foundation work; we don’t begin excavations when rain is forecast within 24 hours.
Full encapsulation with dehumidifier typically costs $4,200-$7,800 for New Braunfels homes between 1,000 and 2,500 square feet of crawl space area, with larger or more complex jobs reaching $9,500. Vapor barrier installation alone runs $1,800-$3,400. The exact price depends on access conditions, drainage needs, and whether existing mold or failed insulation requires removal. Call (830) 243-6352 for a written estimate with no obligation - estimates are always free.
Yes. We install Owens Corning Foamular rigid foam board and Johns Manville mineral wool products regularly in New Braunfels crawl spaces, and we can service or upgrade existing systems built with these materials. We don’t represent either brand exclusively; we select materials based on the specific moisture, fire, and thermal requirements of your space. If your existing system uses another manufacturer’s products, we can match specifications or recommend alternatives.
Yes. Flooded crawl spaces, failed sump pumps, and burst plumbing lines require immediate response to prevent structural damage and mold amplification. Call (830) 243-6352 anytime - a live person answers 24/7, and we dispatch for same-day service on emergencies called in before noon. After-hours emergencies are triaged by severity; standing water contacting electrical components or structural members gets priority dispatch.
All completed work is covered by our 365-Day Done Right Promise - if it’s not done right, we make it right, backed by the written scope and warranty delivered before work began. Vapor barrier materials carry manufacturer warranties ranging from 10 to 25 years against defects; dehumidifiers typically include 1-5 year compressor warranties depending on model. Our labor warranty covers installation quality for one year, with extended coverage available on full encapsulation systems.
Clear access to the crawl space entrance, secure pets away from work areas, and locate your main water shutoff in case we find active leaks during cleanout. Remove stored items from the crawl space before our arrival, or notify us if you need assistance - we can include contents relocation in the scope. We handle all utility coordination, permit requirements, and disposal; no preparation is needed for those items. You’ll receive a pre-arrival text with your technician’s name and ETA under Haven Standard scheduling protocols.
Schedule Your Crawl Space Encapsulation & Vapor Barrier Service in New Braunfels Today
Call (830) 243-6352 now for a free assessment and written price before any work starts. A live person answers 24/7. Wes Okafor and the team at Topside Attic Insulation New Braunfels will inspect your crawl space, document current conditions, and deliver a scope with flat pricing - no surprises, no pressure, just the documented record you need to make an informed decision. Serving New Braunfels, Cibolo, Seguin, and surrounding communities since 2016.
Written by Wes Okafor, Owner at Topside Attic Insulation New Braunfels, serving New Braunfels since 2016.