Demilec Home Energy Audit Nationwide

Demilec Home Energy Audit in San Marcos: What to Know First

We provide independent Demilec home energy audit in San Marcos, typically scheduling within 48 hours and completing the full diagnostic same-day. Most audits run between $280 and $520 depending on home size and whether duct leakage testing is included, and you’ll get a written price before we start - no exceptions. This page is for Demilec owners in San Marcos who’ve noticed uneven temperatures, rising utility bills, or suspect their spray foam isn’t performing as specified. Call (737) 337-8049 to book or text us if you prefer.

Call (737) 337-8049

How Demilec Products Fail - and How We Fix Them

• Heatlok HFO Pro shrinkage at rim joists in older San Marcos slab homes. The HFO blowing agent can contract 3-5% during cure in our Hill Country humidity swings, pulling away from sill plates and creating thermal bypasses. We map these with thermal imaging, remove the compromised foam, and reapply only after sealing the concrete-to-wood joint with compatible sealant.
• Demilec SEALECTION 500 density loss in cathedral ceilings. Open-cell foam in vented cathedral assemblies can degrade when roof leaks go undetected in San Marcos’ spring storm season, dropping from 0.5 lbs/cu ft to chalky residue. We probe with moisture meters, document the affected bays, and specify replacement with closed-cell or a vented assembly redesign depending on structural loading.
• Heatlok XT adhesive failure on OSB roof sheathing in south-facing attics. Black-shingle roofs in San Marcos hit 160°F surface temps; the XT formulation can release from overheated substrate. We find these delaminations with tactile inspection during our energy audit, mark the deficient areas, and re-foam only after verifying adequate ventilation or switching to a higher-temp-rated product.
• SEALECTION Agribalance off-gassing in conditioned crawl spaces. The bio-based content can emit residual odors if applied too thick in a single pass in enclosed San Marcos crawl spaces with limited drying time. We test VOC levels with a photoionization detector, ventilate per manufacturer protocol, and specify reapplication in lifts if the chemistry hasn’t fully reacted.
• Demilec foam bypass at electrical penetrations in top plates. Even well-installed Demilec foam rarely seals the wire holes drilled through top plates - the foam bridges but doesn’t fill. We treat this as a separate air-sealing operation, pulling back insulation where needed and using fire-rated caulk or gasketed boxes to achieve the pressure boundary continuity the foam alone missed.

Our Demilec Home Energy Audit Process

1. 1
   Call intake. A live person answers, asks what you’re experiencing, and schedules. We request any Demilec installation paperwork you have - batch numbers help us check for known formulation issues.
2. 2
   Blower-door test first. We depressurize the house to -50 Pascals and measure CFM50 - a pressurization reading that shows, in one number, how much conditioned air your building envelope is losing. This baseline is non-negotiable; we don’t speculate without it.
3. 3
   Thermal imaging and targeted inspection. We scan every Demilec surface with a FLIR camera, probing suspicious areas with a moisture meter and documenting with photos. The R-value tells you how slow heat moves through the material - the blower-door number tells you whether any of that matters.
4. 4
   Duct leakage test if indicated. We pressurize the duct system and measure leakage to outside, since Demilec-conditioned attics often hide disconnected flex runs behind the foam.
5. 5
   Written scope and price. Before any remediation, you get a single page: what we found, what we’ll do, what it costs, what the warranty covers. Haven Standard Clause 1 - flat price, written scope, written warranty before anyone lifts a tool.
6. 6
   Post-work verification. We run the blower door again and hand you the before-and-after numbers on a printed page. The Documented Photo Record goes to your email before we leave.

Before

After

What Demilec Home Energy Audit Costs in San Marcos

Homes near the Texas State University corridor with original slab-on-grade construction and unsealed top plates - common in 1960s-1980s builds - typically test at 3,500-5,000 CFM50 before work. After proper air sealing, we regularly see 1,800-2,400 CFM50. The audit price doesn’t change based on how bad your numbers are. Call (737) 337-8049 for an exact quote - estimates are free.

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

We’re independently owned and operated under The Haven Standard since 2016 - not a franchise, not a brand affiliate. As an independent Demilec service provider, we work with what you have: Heatlok, SEALECTION, Agribalance, or legacy formulations. If your foam is salvageable, we say so. If it’s not, we specify replacement from Demilec, Icynene, or another manufacturer - no proprietary lock-in. We also service Reflectix radiant barrier systems where they’re part of the assembly.

Wes Okafor and our crew have sealed and insulated 9,000+ homes since 2016, every one with a written price first and a documented record at completion. The 365-Day Done Right Promise applies to all work. Calls are answered live, 24/7, by a person who can schedule you - not a callback queue.

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