Demilec Attic Cleaning & Rodent Proofing Nationwide

Demilec Attic Cleaning & Rodent Proofing in San Marcos: What to Know First

We provide independent Demilec attic cleaning and rodent proofing in San Marcos, Texas, with most jobs completed in one to two days and a written price delivered before any work starts. Our crew handles Demilec open-cell and closed-cell spray foam jobs across Hays County, including the older slab-on-grade stock near the Texas State University corridor where rodent entry through unsealed top plates is a recurring problem. Most attic cleanouts with Demilec foam remediation run between $1,800 and $4,200 depending on contamination extent and whether the foam needs selective removal. Call (737) 337-8049 for a free written estimate - we read your situation with you, not to you.

Call (737) 337-8049

This page is for San Marcos homeowners who have Demilec spray foam in their attic and are dealing with rodent damage, soiled insulation, or the particular odor and structural issues that follow. If you’re comparing contractors, we also service Reflectix radiant barrier systems and can advise when multi-brand coordination matters.

How Demilec Products Fail - and How We Fix Them

• Demilec SEALECTION 500 open-cell foam - rodent tunneling and compression. SEALECTION 500’s lower density, around 0.5 pounds per cubic foot, makes it easy for roof rats and mice to burrow through once they’ve found an entry point. In San Marcos, we see this most in homes built between 2015 and 2020 where the foam was applied directly to roof decking without a physical barrier. We remove the contaminated sections, seal the entry points with galvanized steel mesh and copper wool, then reinstall with a rigid air barrier where code allows.
• Demilec Heatlok XT closed-cell foam - moisture trapping behind the foam. Heatlok XT’s 2.0 pcf density and vapor-impermeable surface can trap roof leaks against the deck for months before visible staining appears. By the time homeowners smell it, the OSB beneath is often punky and the foam is harboring mold. We use controlled removal with thermal-assisted cutting, treat the substrate with an EPA-registered antimicrobial, and document moisture content with pin meters before any replacement.
• Demilec Heatlok HFO Pro - off-gassing and odor retention after rodent infestation. The HFO blowing agent in newer Heatlok HFO Pro formulations is low-global-warming, but the foam matrix itself retains organic odors from rodent urine and feces more tenaciously than fiberglass. Standard sanitizing sprays won’t reach the full depth. We use enzyme-based decontamination followed by sealed HEPA extraction, and we test with a portable VOC meter before declaring the space clean.
• Demilec Agribalance - agricultural-grade misapplication in residential attics. Agribalance was formulated for barns and outbuildings, but we’ve found it in at least three San Marcos residential retrofits where a previous contractor substituted it for residential-grade foam. The higher biocide load irritates respiratory systems and degrades faster in attic heat. Full removal is usually necessary, and we flag this for warranty discussion with the homeowner since Demilec’s residential warranty doesn’t cover agricultural product in living spaces.
• Demilec foam-to-foam transitions - delamination at layer boundaries in thick applications. When Demilec closed-cell is applied in multiple passes for higher R-value, the interface between lifts can separate if the previous skin wasn’t properly prepared. Rodents exploit these gaps. We map delamination with tactile inspection and thermal imaging, then remove to sound substrate before reapplying with proper inter-lift timing.

Our Demilec Attic Cleaning & Rodent Proofing Process

1. 1
   Written price and scope before entry. We inspect the attic access, document the Demilec product type and condition with photos, and deliver a flat price and written scope. No work starts without your signature - Haven Standard Clause 1.
2. 2
   Controlled foam removal if needed. For contaminated or moisture-damaged Demilec foam, we use thermal knives and controlled-depth cutting to preserve structurally sound adjacent material. We bag removed foam per Texas Commission on Environmental Quality guidelines for isocyanate-containing waste.
3. 3
   Entry point identification and exclusion. We trace rodent pathways with UV light to find urine trails, then seal with 19-gauge galvanized hardware cloth, copper mesh, and polyurethane sealant at all penetrations - plumbing stacks, electrical chases, top plates, and eave returns.
4. 4
   Substrate treatment and air sealing. We treat exposed wood with botanical antimicrobial, then seal all top plates, can lights, and penetrations with fire-rated caulk or expanding foam before any new insulation goes in. The R-value tells you how slow heat moves through the material - the blower-door number tells you whether any of that matters.
5. 5
   Replacement insulation and documentation. We reinstall with appropriate material - sometimes new Demilec, sometimes a hybrid system depending on your goals and budget. Every job closes with a Documented Photo Record and, where applicable, before-and-after blower-door readings.
6. 6
   365-Day Done Right Promise activation. Your written warranty and scope are delivered before the crew leaves. If rodents re-enter through our work in year one, we return and make it right.

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What Demilec Attic Cleaning & Rodent Proofing Costs in San Marcos

Most Demilec attic cleaning and rodent proofing jobs in San Marcos fall in these ranges:

What moves the price: square footage of affected foam, whether the roof deck needs repair, accessibility (cathedral ceilings and tight scuttles add labor), and whether we coordinate with a pest control company you’ve already hired or handle exclusion in-house. We don’t charge for the estimate, and we don’t start work until you’ve seen the written price. Call (737) 337-8049 - we’ll read your attic with you.

Why San Marcos Homeowners Call Topside Attic Insulation San Marcos for Demilec Work

We’ve sealed and insulated over 9,000 homes since 2016, and the ones with Demilec foam require a specific diagnostic approach - you can’t just blow new insulation over compromised spray foam and call it done. Wes Okafor trained in building science at Dawson Technical Institute and has spent two decades figuring out why attics fail rather than filling them indiscriminately. Our crew runs blower-door tests before and after applicable jobs, then hands you a single printed page with the before-and-after air-changes-per-hour figure. No claim, just the number.

We’re independently owned and operated, not a franchise, and we source materials from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber - no proprietary lock-in means we recommend what’s right for your specific failure mode. Calls are answered by a live person 24/7. The 365-Day Done Right Promise applies to every completed job, and your Documented Photo Record is included, not available on request.

FAQs