Demilec Blown-In Insulation Nationwide

Demilec Blown-In Insulation in Seguin: What to Know First

We provide independent Demilec blown-in insulation service in Seguin, typically completing attic top-ups and dense-pack wall jobs in one day with a written price locked before any work starts. Most Seguin homeowners with Demilec systems pay between $1,800 and $3,400 for a full attic treatment, depending on square footage and whether the existing material needs removal first. This page is for owners of Demilec Heatlok HFO Pro, Demilec Sealection 500, or legacy Demilec 500 open-cell systems who need blown-in cellulose or fiberglass added as a complementary layer - or who are replacing failed Demilec loose-fill in older Seguin homes near the Guadalupe River corridor where humidity has taken its toll. Call (830) 549-6646 for a free estimate with a written scope and same-week scheduling.

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How Demilec Products Fail - and How We Fix Them

• Heatlok HFO Pro closed-cell spray foam shrinkage at roof decks. In Seguin’s combination of high summer attic temperatures and winter humidity swings, we’ve documented this HFO-blown foam pulling away from rafters in homes built between 2016 and 2020. The gap creates a convection channel that renders any overlying blown-in insulation ineffective. We remove the compromised foam, re-establish the air barrier with compatible material, then blow in cellulose to the correct depth.
• Sealection 500 open-cell water absorption in crawl spaces. This water-blown open-cell foam is hydrophilic - it absorbs moisture when bulk water enters a crawl space. We’ve found this in Seguin homes near the Geronimo Creek watershed where seasonal water tables rise. Saturated Sealection 500 loses R-value and supports mold growth. We extract the wet foam, install a proper vapor barrier, then dense-pack the rim joist with blown-in fiberglass as a moisture-tolerant alternative.
• Legacy Demilec 500 loose-fill cellulose settlement below labeled R-value. Early Demilec loose-fill products installed in Seguin homes during the 2008-2014 building boom were often blown at insufficient density - 0.5 pounds per cubic foot instead of the 1.0-1.5 needed for stability. Over five to seven years, this settles by 20-30%, creating bare spots above top plates. We measure current depth with a ruled probe, calculate the density shortfall, and blow in new material to achieve true R-38 or R-49 as specified.
• Demilec spray foam off-gassing and odor complaints. Some Heatlok formulations, particularly batches applied in poorly ventilated attics during Seguin’s humid shoulder seasons, emit trace amines that homeowners detect as a fishy or sweet odor. This doesn’t mean the foam has failed structurally, but it does mean the attic is unusable for storage and air exchange with living space is a concern. We encapsulate affected areas with a vapor-permeable barrier, then add blown-in fiberglass as a thermal cap that doesn’t interact chemically with the underlying foam.
• Demilec commercial-grade open-cell overspray into soffit vents. On jobs where Demilec contractors used open-cell foam for both air sealing and insulation, we’ve found the material extending past the thermal boundary and blocking soffit intake vents in Seguin’s 1970s ranch-style homes near Guadalupe Regional Medical Center. This kills attic ventilation and accelerates moisture buildup. We carefully trim the overspray with a specialized hot knife, restore vent function, then add blown-in cellulose to the corrected thermal boundary.

Our Demilec Blown-In Insulation Process

1. 1
   Call and scope. A live person answers 24/7. We schedule a site visit, and Wes Okafor or a technician arrives with a written price guarantee - no work starts without it.
2. 2
   Blower-door test and attic documentation. We run a pressurization diagnostic to measure air leakage in CFM50, then photograph every Demilec product label we can locate, existing depth measurements, and any visible failure modes. The report goes home with you - the numbers do the talking.
3. 3
   Air sealing before insulation. Following Haven Standard protocol, we seal top plates, can lights, and penetrations before any blown-in material enters the space. Insulation over unsealed leaks is money thrown away.
4. 4
   Material selection and installation. We match blown-in cellulose, fiberglass, or dense-pack wall material to the specific Demilec system in place and Seguin’s climate load. No proprietary lock-in - we source from Demilec, Owens Corning, Johns Manville, Knauf, and others as the job demands.
5. 5
   Post-installation blower-door test and photo record. We pressurize again, compare pre- and post-readings, and deliver a printed report with ACH50 numbers and dated photos. The 365-Day Done Right Promise begins at this signature.

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What Demilec Blown-In Insulation Costs in Seguin

These are Seguin-market ranges for homes we’ve measured - not bait-and-switch estimates. Every quote is a written price before any work starts, backed by our Free Second Opinion on any competing written estimate. Call (830) 549-6646 for your specific numbers.

Why Seguin Homeowners Call Topside Attic Insulation Seguin for Demilec Work

We’re independently owned and operated, not a franchise, and we’re not affiliated with or authorized by Demilec - we work on their products as an independent service provider with no manufacturer obligations clouding our recommendations. Wes Okafor learned thermal envelope science at Triton College in River Grove, IL, and he’s spent over two decades applying that foundation in attics where textbook theory meets real-world humidity and framing quirks. In Seguin, that means knowing which Demilec batches from which years are prone to what failures, and documenting the fix with blower-door numbers you can hold in your hand. We also carry Reflectix and other brands, so if your situation calls for a hybrid approach rather than Demilec replacement, we’ll say so upfront. The 365-Day Done Right Promise applies to every job, and a live person answers calls 24/7.

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