Demilec Crawl Space Encapsulation & Vapor Barrier in Converse: What to Know First
We provide independent Demilec crawl space encapsulation and vapor barrier service in Converse, with most jobs completed in one day and pricing put in writing before any work starts. As an independent Demilec service provider, we’re not affiliated with or authorized by the manufacturer, which means we source parts based on what actually solves the problem, not what a dealer program requires. Most Converse crawl space encapsulation jobs for Demilec systems run between $2,800 and $5,400 depending on square footage, existing moisture damage, and whether the foundation vents need sealing. If you’re seeing condensation on Demilec insulation, musty smells from below-grade, or sagging vapor barrier in your Converse home, call (830) 420-0953. We’ll read your situation and give you a written price, no obligation.
How Demilec Products Fail - and How We Fix Them
- Demilec Heatlok HFO Pro sagging in crawl space joist bays. This closed-cell spray foam can delaminate from wood surfaces when installed over chronically damp substrate, a common issue in Converse’s clay-heavy soils where groundwater wicks through foundation walls. We remove the failed sections, dry the surface with targeted airflow, then reinstall with a mechanical fastening schedule and proper vapor barrier integration so the new work stays bonded.
- Demilec Sealection 500 developing shrinkage gaps at rim joists. Early batches of this open-cell foam were prone to dimensional change during cure, leaving thermal bypasses at the critical junction between sill plate and foundation. We cut back the compromised foam, seal the gap with compatible acrylic latex, then add a properly lapped vapor barrier to restore the air boundary.
- Demilec Heatlok Soya HFO absorbing moisture in unvented crawl spaces. When homeowners in Converse’s older neighborhoods near Gibbs Sprawl Road convert vented crawl spaces to conditioned space without upgrading the vapor barrier, this bio-based foam can wick moisture and lose R-value. We install a Class I vapor retarder on the ground and walls before addressing any foam remediation, because sealing the leaks first, then insulating, is the only sequence that produces durable results. The numbers will tell you if it worked.
- Demilec open-cell foam acting as a reservoir for crawl space humidity. Open-cell products like Sealection 500 are vapor-permeable by design, which means they’ll hold moisture in a damp crawl space rather than block it. We assess whether the existing foam can stay with proper dehumidification and ground sealing, or whether removal and replacement with closed-cell at the rim joist is the better long-term fix.
- Demilec vapor barrier seams failing at manufacturer-recommended overlap distances. In our Converse jobs, we’ve found that the standard 6-inch seam overlap doesn’t hold up where seasonal groundwater fluctuation creates hydrostatic pressure against the barrier. We extend to 12-inch overlaps with double-sided butyl tape at all seams, and we mechanically fasten the barrier to walls at 12-inch intervals rather than relying on adhesive alone.
Our Demilec Crawl Space Encapsulation & Vapor Barrier Process
- 1
Call and schedule. A live person answers, or you can text. We book a site visit in Converse, usually within 48 hours.
- 2
Site inspection and moisture mapping. We measure relative humidity at multiple crawl space points, identify standing water or efflorescence on foundation walls, and document existing Demilec product condition with photos.
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Written price and scope. Before any work starts, you get a flat price, written scope, and written warranty. Haven Standard Clause 1: no surprises.
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Prep and air sealing. We seal all penetrations, rim joist gaps, and duct boots before installing any new material. In Converse’s older ranch homes, unsealed top-plate penetrations are common pre-existing leaks we close first.
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Vapor barrier and encapsulation. We install 12-mil reinforced polyethylene on the ground, extend it up foundation walls, and seal seams with butyl tape. If dehumidification is needed, we size the unit to the space and add a condensate pump.
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Documentation and closeout. You receive a Documented Photo Record of all work areas, plus any applicable blower-door readings showing envelope improvement. The 365-Day Done Right Promise is in effect from day one.
Before
AfterWhat Demilec Crawl Space Encapsulation & Vapor Barrier Costs in Converse
Most Demilec crawl space encapsulation jobs in Converse fall between these ranges:
- Basic vapor barrier replacement (no foam work): $2,800-$3,800 for 1,000-1,500 sq ft crawl spaces
- Full encapsulation with ground and wall sealing: $4,200-$5,400 for same footprint, including dehumidifier prep
- Demilec foam removal plus re-encapsulation: Add $1,200-$2,400 depending on foam thickness and accessibility
- Rim joist re-insulation with closed-cell foam: $800-$1,600 additional
What moves the price: crawl space height (less than 18 inches adds labor), active mold remediation needs, extent of existing Demilec foam removal, and whether the foundation needs vent sealing or mechanical ventilation conversion. We also service Reflectix products if your system uses hybrid materials. Call (830) 420-0953 for a written estimate - estimates are free, and we offer a Free Second Opinion on any written estimate you’ve already received.
Why Converse Homeowners Call Topside Attic Insulation Converse for Demilec Work
We’ve sealed and insulated over 9,000 homes since 2016, and the Converse jobs stick in our memory because the soil conditions here punish shortcuts. Wes Okafor and our crew have worked the older ranch homes near Foster Road long enough to know where the thermal bridges form and which Demilec batches from which years are showing age. We publish before-and-after blower-door numbers on every applicable job - a pressurization reading that shows, in one number, how much air your building envelope was losing before and after our work. Our materials come from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber, so we’re never locked into a single product line that doesn’t fit your situation. Background-checked, uniformed technicians. Live person on the phone 24/7. Written price before any work starts, always.
FAQs
No - Demilec’s product warranty covers material defects regardless of who installs or services it, though improper application can void coverage. We document our work with photos and written scope so any future warranty claim has clear records of what was done and when. If you’re concerned about a specific product line, bring your paperwork and we’ll read it with you. Call (830) 420-0953.
We source both. For vapor barriers and seam tapes, we often use equivalent or superior aftermarket products with better field performance in Converse’s humidity cycles. For foam remediation requiring compatible substrate primers, we match Demilec’s chemical family to prevent adhesion failures. We tell you which we’re using and why before any material goes in.
Repair is cheaper when the existing vapor barrier is largely intact and the Demilec foam hasn’t delaminated. If you’re seeing widespread moisture staining, compressed or displaced insulation, or mold on wood surfaces, full encapsulation with removal saves money long-term by preventing structural repairs. We’ll show you photos of both paths and price them separately so you decide.
Most site visits are scheduled within 48 hours, and emergency moisture intrusion situations get same-day assessment. Once you approve the written scope, most encapsulation jobs start within 3-5 business days. We don’t do callback windows measured in business days - a live person answers, and you’ll get a named technician with a text when they’re on the way.
We measure relative humidity before and after, and on jobs with significant air sealing component, we run a blower-door test - a pressurization reading that shows, in one number, how much conditioned air your home was losing. You get the printed report, the photo record, and our 365-Day Done Right Promise. If the numbers don’t improve, we find out why and fix it.
Ready to stop losing conditioned air through your crawl space? Call (830) 420-0953 today for a free written estimate on Demilec crawl space encapsulation and vapor barrier service in Converse. We’ll read your situation, put a flat price in writing before any work starts, and leave you with the documentation to prove what was done.
Written by Wes Okafor, Owner & Lead Insulation Technician, Topside Attic Insulation Converse at Topside Attic Insulation Converse, serving Converse and nearby areas.