Knauf Crawl Space Encapsulation & Vapor Barrier in Schertz: What to Know First
We provide independent Knauf crawl space encapsulation and vapor barrier service in Schertz, typically completing most jobs in one to two days with a written price delivered before any work starts. Most full encapsulations with vapor barrier installation in the Schertz market run between $3,200 and $6,800 depending on crawl space square footage, existing moisture damage, and whether the home sits on the clay-heavy soils common east of I-35. This page is for homeowners who already have Knauf insulation products in their crawl space and need to know whether those materials can stay, what fails, and what an honest fix looks like. Call (830) 402-5240 for a free estimate with a written scope.
How Knauf Products Fail - and How We Fix Them
- Knauf EcoBatt with ECOSE Technology in vented crawl spaces: The plant-based binder in EcoBatt performs well in dry conditions, but in Schertz’s spring humidity spikes - when dew points climb past 70°F for weeks - the binder can reactivate and slump against the vapor barrier if the crawl space isn’t properly sealed first. We remove the compromised batts, install a 6-mil minimum polyethylene vapor barrier sealed at seams and piers, then reinstall only after the space is conditioned.
- Knauf Insulation Jet Stream Ultra blown-in fiberglass in floor joist cavities: This loose-fill product settles faster than dense-pack alternatives when subjected to the air washing that happens in leaky crawl spaces near Schertz’s older neighborhoods like Normandy Estates. We extract the settled material, air-seal the rim joist and sill plate with closed-cell foam or Knauf-recommended sealants, then replace with a moisture-appropriate solution.
- Knauf Insulation Board (PIR/polyiso) in band joist applications: The foil facing on Knauf’s rigid board delaminates when chronically exposed to the condensation that forms on Schertz crawl space walls during Gulf moisture intrusion events. We strip the failed boards, treat the concrete or block wall with a masonry sealer rated for below-grade use, then reinstall with proper mechanical fastening and sealed edges.
- Knauf Ecoseal water-based elastomeric sealant in retrofit applications: Ecoseal works as an air barrier when applied to clean, dry substrates, but we’ve found it won’t bond to the alkaline efflorescence that leaches through older Schertz foundation walls - particularly in the flood-prone areas near Cibolo Creek. We mechanically remove the efflorescence, apply a compatible primer, then use Ecoseal or switch to a butyl-based alternative depending on the substrate condition.
- Kn fiberglass batts with kraft facing in contact with soil vapor: The kraft paper facing on standard Knauf batts is a vapor retarder, not a vapor barrier - a critical distinction in Schertz where soil moisture drives upward year-round. When the kraft facing contacts standing water or saturated soil gas, it becomes a mold vector. We remove all kraft-faced product, install a true Class I vapor barrier (0.1 perm or less) on the ground, and replace with unfaced batts only if the crawl space is fully encapsulated and conditioned.
Our Knauf Crawl Space Encapsulation & Vapor Barrier Process
- 1
Pre-work inspection and blower-door test: We pressurize the house to measure how much conditioned air is being lost through the crawl space envelope - this gives us a baseline and identifies whether the crawl space is communicating with the attic through chase ways and duct leaks.
- 2
Written price and scope before any work starts: Haven Standard Clause 1 - flat price, written scope, written warranty delivered before anyone lifts a tool. No exceptions.
- 3
Material diagnosis and parts decision: We identify which Knauf products are in place, their condition, and whether OEM-equivalent replacement or cross-brand substitution (including Reflectix radiant barrier where appropriate) serves the homeowner better. We do not claim exclusive or preferred status with any brand.
- 4
Air sealing first, then moisture control: Seal the leaks first. Then insulate. The attic doesn’t care how thick the insulation is if the air is still moving through it. Same principle applies to the crawl space - rim joists, sill plates, penetrations, and duct boots get sealed before any new vapor barrier or insulation goes in.
- 5
Vapor barrier installation and conditioning: 6-mil minimum polyethylene overlapped 12 inches at seams, sealed to walls and piers with pressure-sensitive tape or mechanical fastening, with drainage matting where groundwater intrusion is active.
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Post-work documentation: Documented Photo Record of every stage, plus a second blower-door test on applicable jobs so the homeowner can verify the air-sealing result in a single figure. Printed thermal-imaging summary included.
What Knauf Crawl Space Encapsulation & Vapor Barrier Costs in Schertz
| Scenario | Typical Range | What Moves the Price |
|---|---|---|
| Vapor barrier only (ground cover, no wall sealing) | $1,800 - $3,200 | square footage, pier count, debris removal |
| Partial encapsulation (ground + walls to sill plate) | $3,200 - $5,400 | wall height, existing Knauf product condition, access constraints |
| Full encapsulation with dehumidification prep | $4,800 - $6,800 | conditioned air supply, electrical for dehumidifier, mold remediation needed |
| Knauf insulation removal and replacement | $800 - $2,400 additional | product type, disposal fees, joist cavity accessibility |
Homes on the east side of Schertz - particularly in the Legacy subdivision and areas with exposed Caliche clay - often need additional grading or drainage work before encapsulation, which we price separately with the same written-scope requirement. Call (830) 402-5240 for an exact quote; estimates are free and include a documented photo record of what we find.
Why Schertz Homeowners Call Topside Attic Insulation Schertz for Knauf Work
We’re an independent Knauf service provider - not affiliated with or authorized by Knauf - which means we evaluate their products on performance, not brand loyalty. Wes Okafor and our crew have worked the Schertz corridor for several years, including jobs in the Sedona subdivision off FM 1518 where summer attic temps regularly push past 140°F before a single batt goes in; we’ve learned that the same Gulf moisture that cooks attics rots crawl spaces from below.
Our 365-Day Done Right Promise applies to all completed work. Every job gets a written price before work starts, a named technician, a text when they’re en route, and a Documented Photo Record when the crew leaves. On applicable jobs, you get before-and-after blower-door numbers in writing. We also service Reflectix products and source materials from Owens Corning, Johns Manville, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber - no proprietary lock-in, ever. Calls are answered by a live person 24/7.
FAQs
No - Knauf’s product warranties cover manufacturing defects, not installation environment, so encapsulation itself doesn’t void coverage. However, if existing Knauf products show moisture damage from pre-encapsulation conditions, that damage isn’t covered as a defect. We document pre-existing condition with photos before any work starts so there’s a clear record. Call (830) 402-5240 if you’d like us to review what’s in your crawl space.
We source Knauf products through standard distribution channels and can match existing EcoBatt, Jet Stream, or board products when appropriate. For some applications - particularly rigid board in high-moisture retrofit conditions - we may recommend a cross-brand equivalent that performs better in that specific environment. We explain the trade-off in writing before you decide.
Repair is rarely cost-effective once Knauf batts or loose-fill have absorbed significant moisture - the binder degradation and compression are irreversible, and spot repairs leave cold bridges that show up on our thermal imaging. Most Schertz homeowners find that full removal, proper air sealing, and new installation costs 15-25% more than partial repair but delivers a documented performance improvement they can verify. We provide both options in writing so you can compare.
Most jobs are completed in one to two days; larger homes or those requiring mold remediation before encapsulation may extend to three. We don’t schedule work until the written scope and price are agreed upon, and we don’t rush the pre-work inspection to hit an arbitrary start date. Same-week availability is common outside of peak spring demand.
In Schertz’s climate, yes - a conditioned crawl space without mechanical dehumidification will still see relative humidity spikes during Gulf moisture events. We rough in electrical and drainage for a dehumidifier during encapsulation and can recommend appropriately sized units. The alternative is connecting the crawl space to your HVAC supply and return, which we evaluate case by case.
Written by Wes Okafor, Owner, Topside Attic Insulation Schertz at Topside Attic Insulation Schertz, serving Schertz and nearby areas.