Demilec Home Energy Audit Nationwide | Walt’s Insulation

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

A Demilec home energy audit in San Antonio typically runs $199 to $495, depending on whether you need just a blower door test or the full package with thermal imaging and duct leakage testing. We complete most audits in two to three hours and walk you through the findings the same day, in plain English. If you own a home with Demilec spray foam insulation – whether it’s Sealection 500, Heatlok HFO, or an older open-cell application – and your energy bills are climbing or rooms feel uneven, this page is for you. Call (866) 751-4428 and a live person answers, day or night. We’re an independent Demilec service provider, not a factory rep, so we tell you what’s actually happening, not what the brochure says should be happening.

Call (866) 751-4428

How Demilec Products Fail – and How We Fix Them

• Sealection 500 shrinkage and pull-away. In San Antonio’s attic heat, open-cell Demilec Sealection 500 can shrink slightly as it cures if it was sprayed too thick in one pass. What you end up with is a hairline gap between the foam and the roof decking or top plate. That gap is a chimney for conditioned air. We catch this with thermal imaging during the audit and reseal with compatible foam before it costs you another summer of $300 electric bills.
• Heatlok HFO off-ratio application. Closed-cell Heatlok HFO is a great product, but if the installer’s spray rig wasn’t dialed in that morning – wrong temperature, incorrect pressure, a clogged B-side filter – the foam can go on with poor cell structure. It looks fine from the floor, but it’s brittle and underperforming. Our blower door test paired with infrared scanning shows exactly which bays didn’t take. The fix is selective removal and respray, not a full tear-out.
• Demilec open-cell air barrier gaps at transitions. Open-cell foam is not an air barrier on its own. It needs a continuous application across all framing transitions. We regularly find missed spots where the ceiling meets exterior walls, especially in older San Antonio homes with irregular framing. During the audit, we mark every transition gap with tape so you can see exactly what we’re sealing.
• Improper substrate moisture before original install. Demilec foam adheres poorly to damp wood or concrete with efflorescence. If the original crew sprayed after a rainy stretch without checking moisture content, the foam can delaminate from the decking. We find this on the north-facing slopes of San Antonio roofs that hold moisture longer. Our audit includes a moisture meter check in suspected areas, and we’ll show you the readings.
• Older Demilec formulations and R-value drift. If your home was foamed 15 or more years ago, you likely have an early Demilec open-cell product that has since been reformulated. Those early installs sometimes settle more than current lines, leaving the top of the cavity exposed. A home energy audit with thermal imaging identifies exactly where the foam has drifted so you’re not paying to re-insulate areas that are still performing fine.

Our Demilec Home Energy Audit Process

1. 1
   The call. You reach a live person, not a recording. We ask about your home’s age, when the Demilec foam was installed, and what symptoms you’re seeing – high bills, hot rooms, drafts.
2. 2
   The walkthrough. Our uniformed, background-checked tech arrives in a marked vehicle. They inspect the attic access, look at the visible foam application, and check for any signs of moisture or pest activity before setting up equipment.
3. 3
   Blower door test. We depressurize the house and measure total air leakage in CFM. This gives us a baseline number we compare against what a properly foamed home of your size should read.
4. 4
   Thermal imaging sweep. With the blower door running, we scan every ceiling, wall, and attic surface. Air movement shows up as temperature anomalies. This is where Demilec-specific issues like shrinkage, off-ratio foam, and transition gaps become visible.
5. 5
   Duct leakage test (as needed). If your ducts run through the attic or a foamed space, we pressure-test them separately. Duct leaks can make even perfect foam look like it’s failing.
6. 6
   The report and the fix. We sit down with you, show you the images and numbers, and give you a written scope of work with upfront pricing. If the fix is small, we often handle it that day. Everything we do falls under the Done Right Promise – if it’s not done right, we make it right, no runaround.

What Demilec Home Energy Audit Costs in San Antonio

Here’s what we charge for Demilec-focused home energy audits in San Antonio. These are real numbers, not “call for pricing” vague ranges.

What moves the price: home size and access difficulty. A two-story house with a tight attic hatch takes longer than a single-story rancher. If your attic has a lot of blown-in insulation on top of the foam, that adds time to the thermal scan. There’s no trip charge inside our service county, and seniors and veterans get 10% off, always. Call (866) 751-4428 and we’ll give you an exact price before we schedule anything.

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

We’ve been the one down the road since 2000. Walt Brenner started this company after watching too many San Antonio homeowners get sold insulation systems that didn’t match South Texas heat and humidity. We’re not a franchise, we’re not an 800 number. We’ve got a published address, a license number, and a live person answering the phone 24/7. Our techs work on Demilec foam regularly – Sealection 500, Heatlok HFO, older open-cell lines – so the brand-specific failure modes don’t surprise us. And if a Demilec product turns out not to be the right fix for your situation, we carry Reflectix and work with Owens Corning, Rockwool, Icynene, Johns Manville, CertainTeed, Knauf, and GreenFiber too. We’ll tell you straight what we’d do if it were our own house, because in a lot of ways, it is – we live here too. We answer the phone live – talk to a real person, get a straight answer.

FAQs