Demilec Insulation Removal & Replacement Nationwide | Walt’s Insulation

Demilec Insulation Removal & Replacement in San Antonio: What to Know First

Demilec spray foam insulation removal and replacement in San Antonio typically runs $1,800 to $6,500 depending on square footage, foam type, and whether we’re pulling open-cell or closed-cell product. Most jobs take one to three days, and we’re an independent Demilec service provider, not a factory-authorized shop, which means we tell you the truth about whether your foam actually needs to come out or can be fixed in place. If you’ve got Demilec foam that’s failed, settled, or turned brittle in a San Antonio attic, call (866) 751-4428 and Walt Brenner’s crew will give you a straight answer.

Call (866) 751-4428

This page is for homeowners dealing with Demilec spray foam that’s gone wrong. Maybe it’s pulling away from the roofline. Maybe it never cured right and the attic still smells three years later. Maybe a roof leak soaked it and now you’ve got mold growing inside the foam itself. We handle all of it.

How Demilec Products Fail - and How We Fix Them

• Heatlam 0.5 and Heatlok HFO shrinkage in San Antonio attics. Demilec’s closed-cell lines are tough products, but we’ve seen shrinkage on south-facing roof decks where attic temps hit 140°F month after month. The foam pulls back from the rafters, leaving a gap that lets humid air condense against the sheathing. We remove the affected sections, address any moisture, and reapply with proper temperature control so it bonds and stays put.
• Sealection 500 open-cell saturation after roof leaks. Open-cell foam is a sponge. One bad flashing job or a hailstorm that cracks a tile, and that foam drinks water and never gives it back. You can’t dry it out from the surface. The fix is cutting out the saturated sections, drying the deck, and replacing with either new Sealection or a closed-cell product depending on the roof’s condition.
• Slow-cure issues with Heatlok Soy blends. We occasionally find attics where a previous contractor sprayed Demilec’s soy-based closed-cell too thick in one pass or installed it when the substrate was too cold or too hot. The result is a crumbly, brittle foam that never reached full density. It has to come out. You can’t re-cure foam after the fact, and no topcoat fixes structural failure.
• Rodent tunneling through open-cell Demilec foam. San Antonio’s roof rat population doesn’t discriminate. Once rats get into an attic with Sealection or any open-cell product, they burrow tunnels through it like it’s dirt. We remove the contaminated foam, clean and sanitize the attic, seal entry points, and replace with a material better suited to the space, sometimes closed-cell Demilec, sometimes Rockwool batts, depending on what the house actually needs.
• Off-gassing complaints from improperly mixed Demilec product. When the A-side and B-side chemicals aren’t mixed at the correct ratio or temperature, the foam never fully reacts and homeowners deal with a lingering chemical odor for years. The only real fix is removal. New foam, properly applied with calibrated equipment, doesn’t smell. If your attic still has a weird smell after someone sprayed Demilec, that’s not normal and it won’t just fade.

Our Demilec Insulation Removal & Replacement Process

1. 1
   We come out and look at it. No trip charge if you’re in our service county. We inspect the foam, check for moisture, take photos, and tell you what’s actually wrong. Sometimes the problem isn’t the Demilec at all; it’s a roof leak or a venting issue.
2. 2
   We give you a written estimate. Upfront pricing, line by line. If you’ve got another written estimate, bring it. We’ll give you a free second opinion on it.
3. 3
   Containment goes up. Demilec foam removal makes dust that gets everywhere if it’s not contained. We seal off the work area with plastic sheeting and run a HEPA air scrubber the entire time.
4. 4
   We remove the failed foam. Scraping, cutting, or vacuuming depending on the product type and where it’s installed. Closed-cell Demilec is a different animal than open-cell, and we don’t cut corners removing either one.
5. 5
   We address what caused the failure. Roof leak? We note it and recommend the fix. Humidity? We adjust ventilation. Rodents? We seal entry points before new insulation goes in.
6. 6
   We install the replacement and clean up. Then we walk you through what we did. Every Demilec job is backed by the Done Right Promise for life. If it’s not done right, we make it right.

What Demilec Insulation Removal & Replacement Costs in San Antonio

Here’s real numbers for the San Antonio market. Attic insulation removal only, no replacement, runs $1.50 to $3.00 per square foot depending on how much foam is up there and how hard it is to get out. Full removal and replacement of open-cell Demilec in a standard 1,500-square-foot attic lands between $3,000 and $5,500. Closed-cell removal and replacement runs higher, $4,500 to $7,500, because the product is denser and takes more labor to strip off the decking.

Vermiculite or contaminated insulation jobs get quoted after inspection. What moves the price: access to the attic, moisture damage underneath the foam, whether we’re dealing with rodent contamination, and how much of the roof deck needs remediation before new insulation goes in. Call (866) 751-4428 and we’ll give you an exact number. Estimates are free.

Why San Antonio Homeowners Call Walt’s Insulation for Demilec Work

We’ve been at this since 2000, and we’ve seen every way insulation fails in a San Antonio attic. That includes plenty of Demilec jobs done wrong by other crews. We’re locally owned and owner-operated, meaning the guy whose name is on the truck is the guy who stands behind the work. Our techs are background-checked and uniformed, and they know Demilec’s open-cell and closed-cell lines well enough to tell you whether a patch job will hold or whether the whole section needs to come out. We also work with Reflectix and other brands, so if Demilec foam isn’t the right product for your space after removal, we’ll tell you that instead of just selling you more of the same. We answer the phone live, 24/7. Talk to a real person, get a straight answer.

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