Demilec Crawl Space Encapsulation & Vapor Barrier Nationwide

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

Demilec crawl space encapsulation and vapor barrier work in Burbank typically runs $2,800-$6,500 depending on crawl space square footage and whether the existing Demilec HFO spray foam or SEALECTION 500 barrier has degraded from our local clay-heavy soil moisture. Most jobs we can scope and price same-day, with work starting within 48 hours of written approval. As an independent Demilec service provider, we don’t represent the manufacturer, but we stock the full Demilec accessory line and have handled more failed vapor barriers in Burbank’s crawl spaces than any other insulation contractor in our service area.

Call (213) 816-1699

This page is for homeowners who’ve found soft spots in their Demilec vapor barrier, noticed musty odors rising through floor registers, or pulled back insulation to find the white SEALECTION coating has turned chalky or delaminated from the concrete stem wall. If that’s your situation, call (213) 816-1699. A live person answers, and we’ll get a technician out to your Burbank property with a written price before any work starts.

How Demilec Products Fail - and How We Fix Them

• SEALECTION 500 delamination at the stem wall in Burbank’s clay soils. The hydrophilic primer that bonds SEALECTION 500 to poured concrete breaks down when seasonal moisture wicks upward through Burbank’s expansive clay subsoil, particularly in the hillside areas near Verdugo Mountains. We see this most in homes built 2008-2016 where the original installer skipped the moisture-cured polyurethane anchor strip. Our fix: mechanical fastening with Demilec-compatible termination bars, not just re-priming, because the substrate itself has become compromised.
• HFO Pro insulation sagging in vented crawl spaces. Demilec’s HFO closed-cell spray foam gains R-value per inch but adds weight. In Burbank’s older ranch homes with 24-inch on-center joist spacing, gravity wins over time, especially where the original pass was too thin to achieve the labeled density. We remove the failed sections, re-strap with galvanized wire and proper spacers, then reapply to Demilec’s specified 2-inch minimum pass thickness. The R-value is what the label says. The performance is what the blower-door test says. We care about the second number.
• Heatlok XT thermal drift in seasonal moisture cycles. Heatlok XT’s polyisocyanurate core can lose up to 15% of its R-value when subjected to repeated wet-dry cycles, which is exactly what happens in Burbank crawl spaces where summer irrigation oversaturation meets winter drying. We diagnose this with a calibrated moisture probe, not visual inspection alone. When we find Heatlok XT with moisture content above 19%, we replace it with a Demilec vapor barrier system rated for hydrostatic pressure, not just vapor diffusion.
• Demilec air barrier gaps at plumbing penetrations. The factory-cut sleeves in Demilec vapor barrier membranes rarely match the actual pipe layout in Burbank’s modified post-war homes, especially in the Magnolia Park neighborhood where homeowners have added bathroom vents and recirculation lines. We field-fabricate Demilec-compatible boot seals with EPDM collars and stainless-steel draw bands, then pressure-test the seal with a smoke pencil. This takes longer than a tape patch. It also doesn’t fail in three years.
• AgriThane 7520 degradation from soil-gas exposure. AgriThane 7520 was marketed for agricultural and light commercial use but appears in some Burbank residential crawl spaces from the 2010-2014 retrofit boom. The aromatic isocyanate formulation breaks down when exposed to methane and radon soil gases common in the Verdugo fault zone. We replace AgriThane with Demilec’s current HFO formulation or, for severe soil-gas conditions, a multi-layer system with a dedicated sub-slab depressurization port integrated into the vapor barrier.

Our Demilec Crawl Space Encapsulation & Vapor Barrier Process

1. 1
   Moisture mapping and material identification. We probe the existing Demilec product with a Delmhorst moisture meter, photograph the label codes, and document the installation pattern. You get these photos before we leave the site.
2. 2
   Blower-door and crawl space pressure diagnostics. We run a blower-door test to establish the home’s baseline ACH50, then isolate the crawl space with a temporary seal to measure pressure differential. This tells us whether the crawl space is acting as a return plenum or a pressure sink.
3. 3
   Written scope and price, no exceptions. Under Haven Standard Clause 1: flat price, written scope, written warranty before anyone lifts a tool. We specify OEM Demilec materials versus quality aftermarket alternatives where the original line has been discontinued.
4. 4
   Air sealing first, then barrier installation. We seal all penetrations with Demilec-compatible sealants, install mechanical termination at the stem wall, then lay the vapor barrier with welded seams, not tape. For HFO spray foam jobs, we achieve the full pass thickness in a single lift where possible, or timed multiple passes per Demilec’s cold-weather protocol.
5. 5
   Post-installation verification. We run a second blower-door test, provide the before-and-after CFM50 readings, and deliver a Documented Photo Record showing seam welds, termination details, and depth measurements. The 365-Day Done Right Promise applies from this date.

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What Demilec Crawl Space Encapsulation & Vapor Barrier Costs in Burbank

These are real numbers for Burbank properties we’ve worked, not national averages. A 1,000-square-foot crawl space in the flatlands near Victory Boulevard runs differently than the same footprint on a hillside lot with a stepped foundation. Call (213) 816-1699 for an exact quote - estimates are free, and we provide a Free Second Opinion on any written estimate you’ve already received.

Why Burbank Homeowners Call Topside Attic Insulation Burbank for Demilec Work

We’ve been working Burbank crawl spaces since 2016, including the tight clearance jobs under 1950s ranch homes in Magnolia Park where the original Demilec installer had to work on their back with a headlamp. Our crew knows the difference between a SEALECTION 500 batch from 2012 and 2018 just by the primer color, because we’ve peeled back enough failed installations to build that reference library.

Every job leaves with a written scope, written warranty, and Documented Photo Record. On encapsulation jobs, you get before-and-after blower-door numbers so you can verify the air-sealing result yourself. If we install it and it’s not right, the 365-Day Done Right Promise means we make it right - no dispute, no delay.

We also service Reflectix radiant barrier systems, so if your Burbank home has a hybrid insulation stack with Demilec below and Reflectix above, one crew handles both. No subcontractor handoffs, no blame-shifting when the interfaces don’t match.

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