Demilec Wall Insulation in Canyon Lake: What to Know First
We provide independent Demilec wall insulation service in Canyon Lake, Texas, for homeowners whose existing wall foam has settled, degraded, or never performed to spec. Most Demilec injection foam and open-cell wall jobs we handle run between $2,800 and $5,400 for a typical 1,800-2,400 square foot home, and we can usually inspect and quote within 48 hours. Every job starts with a written price - no work begins without it - and ends with a Documented Photo Record plus blower-door numbers where applicable.
This page is for Canyon Lake homeowners who have Demilec foam in their walls and are dealing with drafts, high energy bills, or the suspicion that the original install missed something. If your walls were insulated between 2010 and 2019 with Demilec product, there’s a decent chance we’ve seen the exact issue before. Call (737) 227-6219 - a live person answers, 24/7.
How Demilec Products Fail - and How We Fix Them
- Demilec Sealection 500 open-cell wall foam shrinkage. In Canyon Lake’s heat-and-humidity cycle, Sealection 500 can pull away from studs by 1/8 to 1/4 inch, creating convection channels that bypass the R-value entirely. We find this most often in south- and west-facing walls where daily thermal expansion stresses the foam-to-wood bond. Our fix: remove the degraded sections, reseal the gap with a compatible low-expansion foam, then dense-pack the cavity with blown cellulose to restore continuous insulation.
- Demilec Heatlok HFO High Lift overspray and density inconsistencies in retrofit applications. Heatlok HFO was marketed for its high lift capability, but in wall retrofits where installers drilled and filled through drywall, uneven expansion left voids near the top plate and bottom of stud bays. We map these voids with thermal imaging, then drill new access points and inject stabilized cellulose slurry to fill what the original foam missed.
- Demilec 500 Series injection foam hydrolysis in homes near Canyon Lake’s waterfront. The 500 Series water-blown injection foam absorbs moisture over time in homes within a half-mile of the lake, where summer humidity stays above 70% for weeks. The foam breaks down into powder, dropping R-value by 40% or more. We extract the degraded material through minimal drywall cuts, dry the cavity with desiccant airflow, then install Rockwool batts or new closed-cell foam depending on the wall assembly.
- Demilec Sealection Agribalance off-gassing and odor retention in interior walls. The soy-based content in Agribalance can trap organic odors from plumbing leaks or rodent activity that entered the wall years ago. Homeowners describe it as a persistent “sweet chemical” smell. We don’t mask it - we cut access, remove the affected foam entirely, sanitize the cavity, and reinstall with an inert material like fiberglass or mineral wool.
- Demilec open-cell foam air sealing failure at top plates and electrical penetrations. Even where the foam itself is intact, Demilec open-cell products don’t self-seal around wiring holes and top plate gaps the way closed-cell does. We see this in Canyon Lake’s 1980s and 1990s ranch homes where the original insulation contractor skipped manual sealing. Our crew uses aerosol sealant and gasketed boxes to close these bypasses before adding any new insulation - because sealing the leaks first is what makes the insulation matter.
Our Demilec Wall Insulation Process
- 1
Call and schedule. A live person answers at (737) 227-6219, 24/7. We book a diagnostic visit, usually within 48 hours in Canyon Lake.
- 2
Blower-door test and thermal imaging. Wes Okafor or a trained technician runs a blower-door test - a pressurization diagnostic that shows, in one number, how much conditioned air your home is losing. We add thermal imaging to map exactly where Demilec foam has failed inside the walls.
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Written price before any work starts. Under Haven Standard Clause 1, you get a flat price, written scope, and written warranty before anyone lifts a tool. No exceptions.
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Material selection: OEM Demilec vs. quality aftermarket. If your wall assembly needs new foam, we’ll tell you whether Demilec’s current formulation makes sense for your cavity depth and moisture exposure, or whether a different closed-cell product from our multi-brand inventory - Johns Manville, Icynene, or in some retrofit cases Reflectix as a radiant barrier supplement - will perform better long-term. We don’t lock you into any single brand.
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Execution and documentation. We seal first, then insulate. The crew documents every cavity with photos, runs a post-work blower-door test, and prints your before-and-after report on site.
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365-Day Done Right Promise. If it’s not done right, we make it right. The written warranty and photo record are yours to keep.
Before
AfterWhat Demilec Wall Insulation Costs in Canyon Lake
| Job Type | Typical Range | What Moves the Price |
|---|---|---|
| Demilec injection foam removal + cellulose dense-pack (1,800 sq ft home) | $2,800 - $4,200 | Number of exterior walls, drywall repair scope, cavity moisture damage |
| Demilec open-cell retrofit to closed-cell upgrade | $4,000 - $5,400 | Cavity depth, stud spacing, need for vapor barrier modification |
| Targeted Demilec repair (single wall or moisture remediation) | $1,200 - $2,500 | Accessibility, extent of foam degradation, finish repair |
| Interior wall soundproofing replacement (Demilec Agribalance removal) | $2,200 - $3,800 | Wall count, need for resilient channel, finish type |
Homes on the north side of Canyon Lake, particularly in the Startzville and Sattler areas, often need more extensive top-plate sealing due to wind exposure and older construction. That adds labor but prevents the repeat call. We don’t guess - we measure, then write the price.
Call (737) 227-6219 for a free estimate. Bring us a competing quote and we’ll give you a free second opinion, line by line.
Why Canyon Lake Homeowners Call Topside Attic Insulation Canyon Lake 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 first and a documented record at the end. In Canyon Lake specifically, we’ve handled Demilec retrofits on homes near the Cranes Mill Road corridor where radiant heat gain through under-insulated roof decks is about as predictable as a July afternoon on the lake.
Our technicians are background-checked and uniformed, and they know the difference between Sealection 500 and Heatlok HFO without reading a cheat sheet. If your Demilec product is discontinued or unsuitable for your wall assembly, we carry Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, and GreenFiber - no proprietary lock-in. The multi-brand inventory matters because the right fix for your wall might not be the brand that failed in it.
Seal the leaks first. Then insulate. The report tells you whether it worked.
FAQs
The original Demilec warranty, where it still applies, typically covers material defects and requires installation by a Demilec-authorized contractor - which we are not. As an independent Demilec service provider, our 365-Day Done Right Promise covers our workmanship and materials instead. If your original installer is out of business or the warranty has expired, our written scope and warranty become your protection. Call (737) 227-6219 and we’ll review what coverage, if any, might remain on your specific product line.
Demilec has shifted product lines and formulations several times since 2016, and some earlier series are no longer manufactured. We source current Demilec formulations when they’re the right match for your wall assembly, but we don’t force an OEM replacement when a different closed-cell product will perform better. Our inventory includes Icynene and Johns Manville closed-cell foams that often suit Canyon Lake’s humidity better than legacy Demilec open-cell products. You’ll see the options and prices in writing before we proceed.
Spot repair is cheaper when the failure is isolated - one wet wall, a single gapped stud bay, localized shrinkage. Full removal and replacement makes sense when the foam is systematically degraded (common in pre-2015 water-blown injection foam near Canyon Lake’s waterfront) or when the original install missed critical air sealing. We determine this with the blower-door test and thermal imaging, not by guessing. Most Canyon Lake homes fall somewhere between: targeted removal of failed sections, air sealing, and dense-pack cellulose in the balance. The written price reflects exactly which approach we recommend and why.
We typically inspect within 48 hours of your call and schedule work within 3-5 business days once the written price is accepted. Emergency situations - active water intrusion through failed foam, for example - get priority. A live person answers (737) 227-6219 24/7, so you won’t leave a message and wait for a callback window measured in business days.
You get a printed blower-door report showing CFM50 before and after our work - a pressurization reading that shows, in one number, how much conditioned air your home was losing. On applicable jobs, we also provide thermal images comparing wall cavity temperatures. The Documented Photo Record includes every access point, every sealed penetration, and every cavity fill. These aren’t available on request; they’re included on every job, no exceptions. If the numbers don’t improve, we don’t consider the job complete.
Ready to see what’s actually happening inside your walls? Call (737) 227-6219 for a free estimate. We’ll run the diagnostic, write the price, and let the numbers do the talking. Free second opinions available on any written estimate you bring us.
Written by Wes Okafor, Owner & Lead Insulation Technician, Topside Attic Insulation Canyon Lake at Topside Attic Insulation Canyon Lake, serving Canyon Lake and nearby areas.