Demilec Crawl Space Encapsulation & Vapor Barrier Nationwide

Demilec Crawl Space Encapsulation & Vapor Barrier in Pomona: What to Know First

We provide independent Demilec crawl space encapsulation and vapor barrier service in Pomona, typically completing most jobs in one to two days with a written price delivered before any work starts. Most crawl space encapsulation jobs we see in Pomona run between $3,800 and $7,200 depending on square footage, existing moisture damage, and whether the Demilec foam layer needs partial remediation first. This page is for homeowners who have Demilec spray foam or insulation products in their crawl space and need vapor barrier installation, moisture control, or full encapsulation - call (562) 242-7569 for a free estimate with written scope.

Call (562) 242-7569

How Demilec Products Fail - and How We Fix Them

• Demilec Heatlok HFO Pro series - hydroscopic degradation in Pomona’s clay-heavy soils. The open-cell formulation can wick ground moisture upward when the crawl space lacks a proper vapor barrier, creating a damp layer that compresses R-value by 30 to 40 percent over time. We remove the degraded sections, install a 6-mil minimum polyethylene ground cover sealed at seams, then replace with closed-cell Demilec Heatlok XT where moisture risk persists.
• Demilec Sealection 500 - off-gassing and odor retention in poorly ventilated crawl spaces. This water-blown foam can trap musty air if the crawl space was encapsulated without addressing source ventilation first. We cut selective access points, run a blower-door test on the living space above to identify pressure differentials pulling crawl air upward, then rebuild the air barrier with proper mechanical drying before re-encapsulating.
• Demilec Agribalance - pest intrusion at unsealed rim joists. The bio-based content in this series is less appealing to rodents than fiberglass, but gaps left at the sill plate during original installation become highways. We dense-pack the rim joist zone with cellulose after sealing all penetrations with acoustic sealant, then overlay the Demilec layer with a rigid vapor barrier sealed to foundation walls.
• Demilec Heatlok XT - thermal drift at the concrete wall interface. Closed-cell foam can pull away from poured foundation walls in Pomona’s older homes near Ganesha Park and Lincoln Park where seasonal soil movement runs 3/4 to 1 inch annually. We score the gap, inject low-expansion polyurethane to re-adhere, then bridge the repair with a reinforced vapor barrier membrane rated for hydrostatic pressure.
• Demilec open-cell products - vapor barrier incompatibility with reflective insulation. Homeowners who added Reflectix or similar radiant barriers over Demilec open-cell foam created a double vapor barrier that traps condensation. We remove the reflective layer, assess the foam for saturation, and redesign the stack with a single, correctly placed Class I vapor retarder on the warm side per California Title 24.

Our Demilec Crawl Space Encapsulation & Vapor Barrier Process

1. 1
   Call and schedule. A live person answers 24/7. We ask about your Demilec product age, any odors or moisture you’ve noticed, and your crawl space access point.
2. 2
   On-site inspection with documentation. We photograph the existing Demilec installation, test wood moisture content with a pinless meter, and run a blower-door test on the living space to quantify how much conditioned air is being pulled through the crawl.
3. 3
   Written price and scope. You get a flat price, a written scope of work, and a written warranty before anyone lifts a tool. Haven Standard Clause 1: no surprises.
4. 4
   Remediation and preparation. We remove degraded Demilec sections, clean the substrate, seal all air leaks at rim joists and penetrations, and install drainage matting if standing water is present.
5. 5
   Vapor barrier and encapsulation. We install a reinforced polyethylene or cross-laminated vapor barrier, sealed to walls and piers, with a dehumidifier sized to the crawl space volume if mechanical drying is needed.
6. 6
   Final test and record. We run a post-installation blower-door test to confirm the living space is no longer pulling crawl air, photograph the completed work, and deliver your Documented Photo Record with before-and-after readings.

Before

After

What Demilec Crawl Space Encapsulation & Vapor Barrier Costs in Pomona

What moves the price: crawl space height (less than 18 inches adds labor), active water intrusion requiring sump pump, and whether the existing Demilec is water-blown open-cell needing full removal versus closed-cell that can be repaired in place. We also service Reflectix and other radiant barrier products if your stack needs redesign. Call (562) 242-7569 for a free estimate - we’ll read any competing written quote with you under our Free Second Opinion policy.

Why Pomona Homeowners Call Topside Attic Insulation Pomona for Demilec Work

We’ve sealed and insulated more than 9,000 homes since 2016, and a growing share of our Pomona calls come from homeowners who discovered their Demilec installation was done without a vapor barrier or proper air sealing first. Wes Okafor runs a blower-door test before any material goes in, so the final R-value on paper matches what the house actually performs. Our 365-Day Done Right Promise applies to every job, backed by a written scope and written warranty delivered before work starts. Background-checked, uniformed technicians; live person answering calls 24/7; no voicemail loops. We source materials from Demilec, Owens Corning, Johns Manville, and others - no proprietary lock-in means we specify what’s right for your crawl space, not what moves a particular product line.

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