Demilec Crawl Space Encapsulation & Vapor Barrier in Round Rock: What to Know First
We provide independent Demilec crawl space encapsulation & vapor barrier service in Round Rock, typically scheduling within 24-48 hours and completing most jobs in a single day. Most crawl space encapsulation & vapor barrier projects in Round Rock homes run between $2,800 and $6,500 depending on the Demilec product line, square footage, and whether the existing vapor barrier has degraded or the insulation has detached from band joists. We are not affiliated with or authorized by Demilec - we are an independent Demilec service provider - and we do not start any work until you have a written price in hand. This page is for Round Rock homeowners who need their Demilec crawl space system evaluated, repaired, or fully encapsulated and want to know what failure looks like, what fixing it costs, and who will actually show up. Call (737) 259-7528 for a free estimate.
How Demilec Products Fail - and How We Fix Them
- Demilec Heatlok HFO Pro series: In Round Rock’s clay-heavy soils, the HFO Pro’s closed-cell spray foam can pull away from block walls during seasonal moisture swings, creating a gap that lets ground vapor bypass the barrier. We remove the detached sections, treat the wall surface with a masonry-compatible primer, and reapply - or switch to a mechanically fastened vapor barrier assembly if the substrate continues to breathe.
- Demilec Sealection 500 open-cell foam on crawl space ceilings: This product absorbs atmospheric moisture when the crawl space is not fully encapsulated, leading to sagging and weight-induced delamination from floor joists. We find this most often in older Round Rock neighborhoods like Old Town where foundation vents were never sealed. Our fix: remove the saturated foam, install a ground vapor barrier first, then replace with closed-cell or a hybrid encapsulation system.
- Demilec Heatlok XT in band joist applications: The XT formulation can shrink slightly in the first two years, opening hairline gaps at the sill plate that are invisible to the eye but show up immediately on a blower-door test. We spot these with a smoke pencil during our pre-work inspection, then cut back and refoam - or add a backer rod and sealant detail if the gap pattern is widespread.
- Demilec vapor barrier seams in encapsulation systems: Factory-taped seams on Demilec-recommended polyethylene barriers can fail when installed over rough or debris-laden ground, which is common in Round Rock crawl spaces that have never been cleaned out. We do not rely on tape alone; we overlap seams 12 inches minimum and mechanically fasten with vapor-barrier-specific stakes every 2 feet.
- Demilec closed-cell on ductwork in vented crawls: When homeowners in areas like Forest Creek have their crawl space “partially” encapsulated, the temperature differential between wrapped ducts and ambient humid air causes condensation on the foam surface. We see this as a white, chalky degradation pattern. Our approach: full encapsulation with dehumidification, or removal and replacement with a duct-specific insulation strategy that accounts for the remaining ventilation.
Our Demilec Crawl Space Encapsulation & Vapor Barrier Process
- 1
Call and schedule. A live person answers, 24/7. We ask about your Demilec product line if you know it, the home’s age, and any moisture or odor issues. We schedule a free estimate, usually within 24-48 hours in Round Rock.
- 2
On-site inspection and blower-door test. We enter the crawl with a headlamp, moisture meter, and camera. We run a blower-door test on the living space above to quantify how much air the crawl is pulling through the floor assembly. You get a Documented Photo Record of what we find.
- 3
Written price before any work starts. We specify Demilec-compatible materials or, if the original product has failed irreversibly, a quality aftermarket or alternate-brand solution from our multi-line inventory. You see the scope, the price, and the warranty in writing. No work starts until you sign.
- 4
Air sealing first, then encapsulation. Seal the leaks first. The insulation has nowhere to go until you do. We seal rim joists, penetrations, and the sill plate with appropriate Demilec foam or compatible sealant before laying vapor barrier or installing insulation.
- 5
Installation and post-test. We install the vapor barrier, insulation, or full encapsulation system per the written scope. On applicable jobs, we run a second blower-door test and publish the before-and-after CFM50 reading so you can verify the air-sealing result.
- 6
Cleanup and documentation. We leave the crawl space clean, the access door sealed, and you with a written warranty, photo record, and the 365-Day Done Right Promise - if it’s not done right, we make it right.
What Demilec Crawl Space Encapsulation & Vapor Barrier Costs in Round Rock
Most Demilec crawl space encapsulation & vapor barrier jobs in Round Rock fall into these ranges:
- Vapor barrier replacement only (existing Demilec system, barrier degraded): $2,800-$4,200 for a typical 1,200-1,800 square foot crawl space
- Partial encapsulation (barrier + selective insulation repair): $3,800-$5,500
- Full encapsulation with dehumidification (Demilec foam removal and replacement): $5,200-$6,500+
What moves the price: crawl space height (less than 18 inches requires specialized equipment), extent of existing Demilec foam removal, need for mold or rodent remediation before encapsulation, and whether the home sits on Round Rock’s expansive clay soils that require additional drainage detailing. We also service Reflectix systems and can quote a hybrid approach if that makes sense for your home. Every estimate is free, and we offer a Free Second Opinion on any written estimate you bring us. Call (737) 259-7528.
Why Round Rock Homeowners Call Topside Attic Insulation Round Rock for Demilec Work
We’ve been independently owned and operated under The Haven Standard since 2016, and we’ve sealed and insulated more than 9,000 homes - every one with a written price before work started and a documented record when the crew left. Wes Okafor, our owner, spent the better part of two decades doing thermal and air-sealing work across Central Texas after getting his fundamentals at Richard J. Daley College on Chicago’s South Side. He and the crew have worked Round Rock neighborhoods from Behrens Ranch to Fern Bluff long enough to know which crawl space configurations in this part of Williamson County hide the bypasses that kill encapsulation performance.
Our technicians are background-checked and uniformed. Calls are answered by a live person, 24/7. We publish before-and-after blower-door numbers on every applicable job. And we do not ask you to trust us - we ask you to read the documentation we give you.
FAQs
No - Demilec’s product warranty covers material defects, not who installs or services it. As an independent Demilec service provider, we use warranty-safe practices: compatible primers, correct foam densities, and documented installation conditions. If your Demilec product has a valid material defect, we document it with photos and readings so you have what you need for any manufacturer claim. Call (737) 259-7528 and we’ll review your warranty status during the free estimate.
We source Demilec products through standard distribution channels when they are the right choice for the repair. For some encapsulation scenarios - particularly when the original Demilec formulation has failed due to site conditions - we may recommend a quality aftermarket or alternate-brand solution from our inventory, which includes Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, and GreenFiber. We explain the trade-off in writing before you decide. No proprietary product lock-in.
Repair is cheaper in the short term if the failure is localized - a detached vapor barrier section, a single rim joist gap, or spot foam degradation. Full replacement makes sense when the original encapsulation was installed in a vented crawl space without proper ground sealing, when multiple Demilec components have failed, or when the blower-door test shows the floor assembly is still leaking significantly after spot repairs. Most Round Rock homeowners who call us have already tried one repair and are ready for a system that works. We’ll give you both prices and let the numbers decide.
Most inspections happen within 24-48 hours. Standard encapsulation and vapor barrier jobs are completed in one day. If we find active water intrusion or significant mold, we may need to bring in a remediation partner first, which adds 3-5 days. Emergency situations - a detached vapor barrier exposing structural wood, or saturated insulation creating a smell in the living space - we prioritize same-day or next-day response. Call (737) 259-7528 to check current availability.
You receive a written scope of work, a written warranty, a Documented Photo Record of the crawl space before and after, and on applicable jobs, the before-and-after blower-door test results showing the actual CFM50 reduction. This is Haven Standard practice - have it in writing - and it is included on every job, not available on request.
Written by Wes Okafor, Owner, Topside Attic Insulation Round Rock at Topside Attic Insulation Round Rock, serving Round Rock and nearby areas.