Trusted Crawl Space Encapsulation & Vapor Barrier for Schertz Homeowners
Crawl space encapsulation and vapor barrier installation in Schertz typically costs $2,800-$7,500 for a full encapsulation and $1,200-$2,800 for vapor barrier-only jobs, with most projects completed in one to two days. Since 2016, we’ve sealed and treated more than 9,000 homes across the San Antonio metro area, including hundreds in Schertz, Cibolo, and Universal City where clay-heavy soils and seasonal humidity push ground moisture straight through unsealed crawl spaces. Our crews are available for same-day assessments in Schertz, and a live person answers calls at (830) 402-5240 around the clock.
Schertz sits on the edge of the Texas Blackland Prairie where summer humidity routinely climbs past 70% and winter cold snaps can drop temperatures into the 20s. That combination, what building scientists call the “stack effect,” pulls damp, mold-laden air from your crawl space straight into your living areas through floor joists, plumbing chases, and ductwork penetrations. We’ve measured blower-door readings in Schertz homes where the crawl space contributed 30-40% of total air leakage. Under The Haven Standard, every encapsulation job begins with a written price and ends with a Documented Photo Record; on applicable jobs, we provide before-and-after blower-door numbers so you can verify the air-sealing result in a single figure.
Our technicians are background-checked and uniformed, and you’ll get a text when your technician is on the way. No voicemail loops, no callback windows measured in business days.
What Our Crawl Space Encapsulation & Vapor Barrier Service Includes
Crawl Space Vapor Barrier
A Crawl Space Vapor Barrier is a heavy polyethylene sheet, typically 6-20 mil thickness, installed across the dirt floor of your crawl space to block ground moisture evaporation. In Schertz, where expansive clay soils hold water for days after rain, an unsealed dirt floor can release gallons of water vapor daily into the framing above. We install vapor barriers with sealed seams and perimeter attachment to the foundation walls, not just laid loose on the ground, so the barrier actually stops moisture rather than trapping it underneath. Every vapor barrier job includes a Documented Photo Record showing seam sealing and wall termination details.
Crawl Space Encapsulation
Full encapsulation seals the entire crawl space, floor, walls, and sometimes piers, transforming it from a vented, outside-air space into a conditioned or semi-conditioned zone within your building envelope. In Schertz’s climate, vented crawl spaces are particularly problematic because summer humidity enters through foundation vents and condenses on cool ductwork and floor joists. We seal all vents, install a reinforced vapor barrier up the walls to the sill plate, and add mechanical dehumidification or tie into your HVAC supply depending on the home’s configuration. Our encapsulation jobs include air sealing of rim joists and penetrations before any membrane goes in, because sealing first, then insulating, is the only sequence that produces measurable results.
Crawl Space Insulation
Crawl Space Insulation typically involves rigid foam board on foundation walls, spray foam at rim joists, or batt insulation in floor joists, depending on whether the space is vented or encapsulated. In Schertz, we rarely recommend floor-joint batts in vented crawl spaces anymore because they act as filters for humid outside air, becoming saturated and falling away within a few years. For encapsulated crawl spaces, we prefer closed-cell spray foam or rigid XPS board, materials from suppliers like Owens Corning and Icynene that we’ve worked with extensively since 2016. Every insulation job includes a written scope specifying R-value, material type, and installation method before any work starts.
Crawl Space Moisture Control
Moisture control addresses the sources of water vapor and liquid water that make crawl spaces hospitable to mold, wood rot, and pest infestation. In Schertz, we regularly find three moisture drivers: bulk water from poor exterior grading or downspout discharge, capillary rise through foundation footings, and vapor drive from exposed soil. Our moisture control assessments include a thorough inspection of exterior drainage, interior water staining patterns, and wood moisture content readings with a pin-type meter. We address what we find, whether that’s regrading a downspout line, installing a perimeter drain and sump pump, or simply sealing the envelope properly. The written price you receive itemizes each component so you know what you’re paying for and why.
Crawl Space Cleanout
Crawl space cleanout removes existing debris, failed insulation, pest droppings, and mold-contaminated materials before any encapsulation or insulation work begins. In older Schertz neighborhoods like those near Schertz Parkway or along FM 3009, we’ve found everything from disintegrated fiberglass batts to rodent nesting in fallen insulation that previous owners never addressed. We remove contaminated materials with proper containment, treat affected framing with an EPA-registered fungistat where appropriate, and haul everything off-site. The Documented Photo Record from your cleanout shows before, during, and after conditions, so you have visual proof of what was removed and what remains structurally sound.
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 encapsulation and insulation materials from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber, with no proprietary product lock-in that limits your options. Our crews have installed Owens Corning Foamular rigid board in hundreds of Schertz crawl spaces, particularly in homes near the Cibolo Creek watershed where foundation walls need both insulation and moisture resistance. We specify Foamular NGX, their next-generation formulation, for below-grade applications where long-term R-value retention matters.
We’ve also applied Icynene and Demilec closed-cell spray foam in tight crawl spaces throughout Selma, Converse, and Live Oak where rigid board installation would be impractical. These materials create both an air barrier and vapor barrier in a single application, which simplifies the assembly and reduces the risk of condensation within the wall cavity. Whether your home currently has no insulation, failed fiberglass batts, or a partial encapsulation that needs completion, we can specify the right material for the condition and geometry of your crawl space. And under The Haven Standard, you get a Free Second Opinion on any written estimate, bring us a competing quote and we’ll read it with you.
Signs You Need Crawl Space Encapsulation & Vapor Barrier Right Now
- Musty odors that worsen in humid weather. If your Schertz home smells damp or earthy, particularly in first-floor rooms or closets over the crawl space, that odor is volatile organic compounds from mold and bacterial growth on wet wood. The stack effect pulls these compounds upward through every penetration in your floor system. We’ve traced persistent odor complaints to crawl spaces with 80%+ relative humidity and visible fungal growth on joist bottoms.
- Sagging or soft spots in first-floor flooring. When crawl space humidity stays above 20% wood moisture content for extended periods, floor joists and subflooring lose structural integrity. In homes near the Guadalupe River drainage or in lower-lying Schertz subdivisions, we’ve replaced rim joists and sill plates that had turned to pulp from years of unaddressed moisture. Soft spots are not a cosmetic issue, they’re a structural failure in progress.
- Cold floors in winter despite adequate attic insulation. If your attic is well-insulated but your tile or hardwood floors are cold to the touch in January, unconditioned air is moving through your crawl space and stripping heat from the floor assembly. Blower-door testing in Schertz homes often reveals that the crawl space contributes more to winter heat loss than attic bypasses. Encapsulation and rim-joist air sealing typically reduce this loss by 40-60%.
- Visible mold on floor joists or HVAC ducts. White, green, or black growth on wood or metal in your crawl space indicates active moisture conditions that support fungal colonization. Mold in crawl spaces is not isolated, spores and mycotoxins become airborne and distribute through the house. We document all mold findings with photos and recommend appropriate remediation before encapsulation, because sealing over active growth traps the problem and accelerates decay.
- Higher-than-expected summer cooling bills. When humid crawl space air contacts cool ductwork, condensation forms on the exterior of ducts and the HVAC system works harder to maintain setpoint. In Schertz’s climate, we’ve measured supply duct surface temperatures below the dewpoint of vented crawl space air for 6-8 months of the year. Encapsulation raises crawl space temperature and reduces the cooling load attributed to duct losses by 15-25% in typical homes.
Our Crawl Space Encapsulation & Vapor Barrier Process - Step by Step
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On-site assessment and moisture mapping. We inspect your crawl space with a focus on four factors: bulk water entry points, vapor drive from soil, air leakage paths at rim joists and penetrations, and existing insulation condition. We take wood moisture readings at multiple joist locations and photograph every finding. For Schertz homes, we also assess exterior grading and downspout discharge because clay soils here hold water against foundations longer than sandy soils would.
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Written scope and written price before any work starts. Under Haven Standard Clause 1, you receive a flat price, written scope, and written warranty before anyone lifts a tool. No verbal estimates, no “we’ll see how it goes” pricing. Your scope specifies materials by brand and thickness, air-sealing details, dehumidification if indicated, and the blower-door testing that will verify results on applicable jobs.
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Preparation and cleanout. We remove failed insulation, debris, and contaminated materials with proper containment. If mold treatment is needed, we apply an EPA-registered fungistat and allow proper dwell time before encapsulation begins. The Documented Photo Record starts here, with before photos of every area to be treated.
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Air sealing before insulation or encapsulation. We seal rim joists, sill plates, plumbing and electrical penetrations, and duct boot connections with appropriate materials, spray foam, caulk, or gasketed covers depending on the penetration type. This is the step most contractors skip or minimize, and it’s why we publish before-and-after blower-door numbers. In a typical Schertz encapsulation, we target 25-40% reduction in CFM50 from this step alone.
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Vapor barrier installation, wall insulation, and final verification. We install the reinforced vapor barrier with sealed seams and mechanical attachment, add wall insulation per the written scope, and install dehumidification or conditioning as specified. The crew photographs all completed work, and on applicable jobs we run a final blower-door test to document the air-sealing improvement. You receive the Documented Photo Record, written warranty, and blower-door results before we leave.
How Much Does Crawl Space Encapsulation & Vapor Barrier Cost in Schertz?
A typical crawl space vapor barrier installation in Schertz runs Crawl Space Encapsulation & Vapor Barrier pricing of $1,200-$2,800 for a standard 1,200-2,000 square foot footprint, depending on mil thickness, seam sealing detail, and whether we need to address minor grading or drainage issues first. Full encapsulation with wall insulation, sealed vents, and mechanical dehumidification typically ranges from $4,500-$7,500 in the Schertz market, with larger homes or those requiring significant cleanout and mold treatment at the higher end. Partial encapsulations, where we seal and insulate only the most problematic zones, can sometimes be completed for $2,800-$4,200.
Several factors move the price in either direction. Access height matters, crawl spaces under 18 inches require different techniques and more labor. The condition of existing insulation and whether hazardous materials are present, we occasionally find vermiculite in pre-1980s Schertz homes, affects preparation costs. Exterior drainage corrections, extending downspouts, regrading swales, or installing French drains, are priced separately and only when our assessment shows they’re necessary for long-term performance.
The most common way homeowners overpay is accepting a vapor barrier-only solution when the real problem is unsealed air leaks at rim joists, or conversely, paying for full encapsulation when a properly sealed vapor barrier and targeted air sealing would suffice. We provide a Free Second Opinion on any written estimate because we’ve seen both scenarios repeatedly. Our written price includes all labor, materials, disposal, and documentation. No line items appear after you sign.
Every estimate is free, delivered in writing, and valid for 30 days. Call (830) 402-5240 to schedule.
Crawl Space Encapsulation & Vapor Barrier Near Schertz - Our Service Area
We complete crawl space encapsulation and vapor barrier projects throughout the Schertz area with typical response times of same-day to 48 hours for assessments. Our primary service corridor includes Crawl Space Encapsulation & Vapor Barrier in Schertz, Crawl Space Encapsulation & Vapor Barrier in Cibolo, and Crawl Space Encapsulation & Vapor Barrier in Universal City, plus Selma, Converse, Live Oak, Windcrest, Kirby, New Braunfels, Terrell Hills, Alamo Heights, and Castle Hills. Homes in the Cibolo Creek and Martinez Creek watersheds often need additional attention to bulk water management before encapsulation. Travel beyond this radius is available for full-building-envelope projects combining attic and crawl space work.
Serving Schertz, TX - Our Local Coverage Area
We’re based in the Schertz 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 Schertz
Crawl space encapsulation is the process of sealing your crawl space from outside air and ground moisture using a heavy vapor barrier, sealed seams, closed vents, and often mechanical dehumidification, while a vapor barrier alone is the membrane component that blocks soil moisture evaporation. In Schertz’s humid climate, encapsulation typically produces better long-term results than vapor barrier-only installations because it addresses both vapor drive and air leakage. We assess your specific crawl space conditions and recommend the appropriate scope, never more than necessary.
Most crawl space encapsulation projects in Schertz are completed in one to two working days, with vapor barrier-only installations often finished in a single day. Projects requiring extensive cleanout, mold treatment, or exterior drainage corrections may extend to three days. We provide a specific timeline in your written scope before work begins, and we don’t start until you have that document in hand. Call (830) 402-5240 for an exact estimate on your timeline, estimates are free.
Crawl space encapsulation in Schertz typically costs $4,500-$7,500 for a complete system including vapor barrier, wall insulation, sealed vents, and dehumidification, while vapor barrier-only installations run $1,200-$2,800. Prices vary with crawl space square footage, access conditions, existing insulation condition, and whether exterior drainage work is needed. We provide a flat, written price before any work starts under Haven Standard Clause 1, with no surprise additions. Call (830) 402-5240 for your specific estimate.
Yes, we regularly install Owens Corning Foamular rigid insulation and apply Icynene closed-cell spray foam in Schertz crawl spaces, and we source from multiple manufacturers including Demilec and GreenFiber with no proprietary lock-in. Our crews are trained in the installation requirements for each material type, particularly the moisture and temperature limitations that affect below-grade performance. If your home already has one of these products and needs repair or extension, we can match the existing system or recommend an alternative if the original material has failed.
We answer calls 24/7 through a live person, not a voicemail system, and we can typically dispatch for urgent crawl space issues like flooding, sewage backup, or structural concerns within the same day in Schertz. True emergencies, active water intrusion threatening structural components or electrical systems, receive priority scheduling. For non-urgent moisture or odor concerns, we usually book assessments within 24-48 hours. Call (830) 402-5240 anytime to discuss your situation and get a realistic arrival estimate.
All completed crawl space work is backed by our 365-Day Done Right Promise, if it’s not done right, we make it right, plus the written warranty delivered before work starts under The Haven Standard. The specific warranty terms vary by scope: vapor barrier materials typically carry a 10-25 year manufacturer warranty against degradation, while our workmanship is guaranteed for one year with extended coverage available for full encapsulation systems. The written warranty you receive before we begin spells out exactly what’s covered, by whom, and for how long.
Clear access to the crawl space entrance, remove stored items if possible, and ensure pets are secured so our technicians can work without interruption; we handle everything else including utility notifications if needed. For Schertz homeowners, it’s helpful to note any previous water intrusion events, plumbing leaks, or pest treatment history so we can factor those into our assessment. We bring all tools, materials, containment equipment, and documentation systems with us. You’ll receive a text when your technician is en route, and a named technician, not an unnamed crew, completes your work.
Schedule Your Crawl Space Encapsulation & Vapor Barrier Service in Schertz Today
Call (830) 402-5240 to speak with a live person and schedule your free assessment. We’ll provide a written price before any work starts, a Documented Photo Record when we’re done, and on applicable jobs, before-and-after blower-door numbers that prove the air-sealing result you paid for. The 365-Day Done Right Promise applies to every project, and we never ask you to commit without knowing exactly what you’ll pay and exactly what you’ll receive.
Written by Wes Okafor, Owner at Topside Attic Insulation Schertz, serving Schertz, Cibolo, Universal City, and surrounding communities since 2016.