Demilec Spray Foam Insulation in Round Rock: What to Know First
We provide independent Demilec spray foam insulation service in Round Rock, with most diagnostic and repair calls completed same-day or next-day. A typical open-cell or closed-cell foam job in a Williamson County home runs between $2,800 and $6,400 depending on cavity depth, square footage, and whether the existing material needs full removal. We publish a written price before any work starts, and we do not begin until you have that number in hand.
This page is for Round Rock homeowners who already have Demilec foam in their walls, roof deck, or rim joists and need to know what’s failing, what fixing it actually costs, and who can do the work without voiding whatever warranty coverage remains. If you’re seeing sagging foam, odor issues, or gaps where the material has pulled away from framing, call (737) 259-7528. We answer live, 24/7.
How Demilec Products Fail - and How We Fix Them
- Heatlok HFO High Lift shrinkage in vented attics. The high-lift closed-cell formulation can pull away from roof decking in Round Rock’s 110°F summer attic peaks, especially when the substrate wasn’t properly conditioned before application. We find this most often in homes built 2018-2021 in neighborhoods like Paloma Lake. Our fix: remove the failed sections, recondition the deck surface, and reapply with corrected lift thickness and temperature parameters.
- Heatlok XT off-gassing in sealed crawl spaces. When the A-side and B-side ratios drift during installation, residual isocyanate can linger in low-ventilation areas. Homeowners notice a sharp, chemical smell that doesn’t fade after the standard 24-72 hour cure window. We test with a photoionization detector, identify the affected bays, and remove and replace only the compromised material rather than stripping the whole crawl.
- Sealection 500 open-cell water absorption in rim joists. Open-cell foam below grade can wick moisture during Round Rock’s spring storm season when the exterior grade slopes toward the foundation. The foam doesn’t fail structurally, but the moisture breeds mold on the face. We remove the waterlogged sections, install a vapor-retarding closed-cell replacement (typically Heatlok XT at 2 inches minimum), and address the exterior drainage.
- Demilec AgriThane agricultural-grade foam used in residential garages. Some Round Rock builders specified this lower-density material for garage ceiling applications during the 2019-2022 construction rush. It lacks the compressive strength for overhead use and sags within 18-24 months. We replace it with Heatlok HFO Pro at the proper density for ceiling application, supported with mechanical fasteners where code requires.
- Improper mixing ratios causing brittle, crumbly foam throughout the envelope. This shows up as a uniform texture issue across multiple cavities, not isolated spots. The foam snaps instead of flexing when probed. In Round Rock, we trace this to installer error more than product defect, but the remediation is the same: full removal, substrate prep, and reinstallation with real-time ratio monitoring and core sample verification.
Our Demilec Spray Foam Insulation Process
- 1
Call and scheduling. A live person answers, books a window, and sends a text when your technician is en route. Under Haven Standard: Arrive on schedule, you get a named technician.
- 2
On-site diagnostic with photo documentation. We inspect the affected cavities, probe the foam density and adhesion, and record everything. You get these photos in your job file before we leave.
- 3
Blower-door test (when the envelope allows). If the home’s air barrier is intact enough to test, we run a blower-door test - a pressurization reading that shows, in one number, how much air your building envelope is losing. This establishes the baseline.
- 4
Written price and scope. We specify OEM Demilec material or quality aftermarket equivalent, line-item the labor, and note warranty implications of each choice. No work starts until you have this in writing.
- 5
Air sealing first, then foam. Seal the leaks first. The insulation has nowhere to go until you do. We seal top plates, penetrations, and bypasses before any new foam goes in.
- 6
Installation, core sampling, and post-test. We apply, pull a core sample to verify density and thickness, and rerun the blower-door on applicable jobs. You leave with the written scope, the photo record, and the numbers.
What Demilec Spray Foam Insulation Costs in Round Rock
These are real ranges from jobs we’ve completed in Round Rock and Williamson County. Your written price may fall outside these brackets if the cavity configuration is unusual or if hazardous material remediation is required.
| Job Type | Typical Range | What Moves the Price |
|---|---|---|
| Open-cell wall cavity (1,200 sq ft home) | $2,800 - $4,200 | Cavity depth, existing removal, access difficulty |
| Closed-cell rim joist (typical 1,800 sq ft home) | $3,400 - $5,100 | Linear feet, exterior drainage work needed |
| Roof deck, closed-cell (attached garage) | $4,200 - $6,400 | Deck area, pitch, whether HVAC is in the space |
| Failed foam removal and replacement | Add 40-60% to above | Containment, disposal, substrate repair |
We also source from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, and GreenFiber - so if a Demilec replacement isn’t the right call for your situation, we have options. Bring us any written estimate for a free second opinion. Call (737) 259-7528 for your exact number; estimates are free.
Why Round Rock Homeowners Call Topside Attic Insulation Round Rock for Demilec Work
We’ve sealed and insulated over 9,000 homes since 2016, and we’ve learned that the documentation matters more than the sales pitch. Every Demilec job gets a written price before work starts, a Documented Photo Record, and on applicable jobs, before-and-after blower-door numbers you can verify yourself. Our 365-Day Done Right Promise means if the foam doesn’t perform as specified, we make it right.
Wes Okafor and our crew have worked from Behrens Ranch to Fern Bluff long enough to know which Round Rock attic configurations hide the bypasses that kill spray foam performance. We’re background-checked, uniformed, and we don’t upsell air sealing - it’s prerequisite, not optional. We also service Reflectix systems for homeowners with mixed insulation types.
As an independent Demilec service provider, we are not affiliated with or authorized by Demilec. We maintain warranty-safe practices by following manufacturer specifications for temperature, humidity, and mixing ratios during application.
FAQs
It depends on who does the work and how. Demilec’s warranty typically requires that repairs use Demilec-specified materials and application parameters. We document our mixing ratios, substrate temperatures, and cure times to preserve whatever warranty term remains. If you have your original installation paperwork, bring it to the estimate and we’ll review the coverage with you. Call (737) 259-7528 to schedule.
Usually, yes. We stock Heatlok HFO, Heatlok XT, and Sealection 500 for Round Rock jobs. If your home has a discontinued Demilec line, we specify the closest current equivalent and note the density and R-value difference in your written scope. You approve the substitution before we order material.
Patching is cheaper when the failure is isolated to one or two cavities - typically $400-$900. When the issue is systemic, like off-ratio mixing or widespread shrinkage, partial patching creates thermal bridges and moisture traps that cost more later. We tell you which category your job falls into during the diagnostic, with photos. Call (737) 259-7528 for the assessment.
Most diagnostics happen same-day or next-day. Material-dependent repairs usually start within 2-4 business days. Demilec-specific products we don’t stock locally add 3-5 days for freight. We give you a firm start date in writing, not a window.
We test adhesion by cutting a small sample joint and checking for delamination. If the existing foam is too oxidized or contaminated, we specify scarification or full removal in your written scope. You see the test result before we proceed. The 365-Day Done Right Promise covers adhesion failure if we recommended keeping existing material.
Written by Wes Okafor, Owner, Topside Attic Insulation Round Rock at Topside Attic Insulation Round Rock, serving Round Rock and nearby areas.