Johns Manville Home Energy Audit Nationwide

Johns Manville Home Energy Audit in San Marcos: What to Know First

We provide independent Johns Manville home energy audit in San Marcos, typically scheduling within 48 hours and completing most audits the same day we arrive. A full Johns Manville-focused audit runs between $275 and $550 depending on home size and whether we include duct-blaster testing alongside the standard blower-door and thermal imaging package. We publish your before-and-after air-leakage numbers in writing, and we do not start any work without a written price you approve first. This page is for Johns Manville insulation owners in San Marcos who want to know whether their building envelope is performing to the R-value printed on the batts, and what it costs to find out. Call (737) 337-8049 for a free estimate.

Call (737) 337-8049

How Johns Manville Products Fail - and How We Fix Them

• JM Spider Custom Insulation settling in San Marcos attics. Spider, the blown-in fiberglass system designed to cling without netting, relies on proper moisture content during install. In San Marcos, where attic temperatures swing from 40°F winter mornings to 140°F summer afternoons, Spider that was blown too dry or too wet loses its adhesive bond and settles at the eaves, leaving the center of the attic underinsulated. We spot this with thermal imaging, remove the settled material, and reinstall to Johns Manville density specs using our own moisture-checked blower.
• JM Climate Pro batts compressed by later contractor work. Climate Pro, the formaldehyde-free fiberglass batt line common in 2018-2022 San Marcos builds, performs at its labeled R-value only at full loft. We regularly find Climate Pro batts squashed under walkway boards or pushed aside for recessed-light retrofits, creating thermal bypasses. Our audit maps these compression zones with an infrared camera, then we reinstall or replace to full thickness.
• JM AP Foil-faced polyiso board tape failures at rim joists. AP Foil, the foil-faced polyiso used in crawl space and basement applications, seals via foil-to-foil tape at seams. San Marcos clay soils shift seasonally, and that movement cracks the tape at rim-joist corners. The result is conditioned air pouring into the crawl space. We identify these tape breaches with a blower-door test and smoke pencil, then reseam with acrylic-foil tape rated for the temperature swing.
• JM fiberglass batts installed without air sealing at top plates. This is not a product defect but an installation failure we see constantly in San Marcos slab-on-grade homes near the Texas State University corridor. Johns Manville batts, even the high-density Climate Pro+, do not stop air movement. When the top plate, the horizontal framing member where walls meet ceiling, is unsealed, batt insulation becomes an air filter, not a thermal barrier. We pull back the batts, seal the plate with acoustic sealant and rigid foam, then reinstall.
• JM blown-in fiberglass contaminated by rodent activity in older San Marcos neighborhoods. In homes built during the 1980s and 1990s near the Blanco River corridor, we find Johns Manville blown-in fiberglass that rodents have tunneled through, compressing it and adding urine saturation. The R-value drops; the air quality drops faster. Our audit includes insulation inspection and, when needed, removal, sanitization, and reinstall of fresh JM material to current density.

Our Johns Manville Home Energy Audit Process

1. 1
   Call and schedule. A live person answers, 24/7. We ask square footage, year built, and whether you know the Johns Manville product line installed. You get a two-hour arrival window and a text when the technician is en route.
2. 2
   Visual and thermal inspection. We walk the attic, crawl space, and conditioned space with a FLIR thermal camera, looking for the specific failure patterns above. We photograph everything.
3. 3
   Blower-door test. We depressurize the house to -50 Pascals and measure CFM50, the cubic feet per minute of air leakage at that pressure. This is your baseline number. If duct testing was requested, we run a duct-blaster to measure leakage to outside.
4. 4
   Written scope and price. Before any repair or sealing work begins, you receive a single page: what we found, what we recommend, the exact price, and the warranty terms. No work starts without your signature. Haven Standard Clause 1.
5. 5
   Air sealing and insulation correction. We seal top plates, can lights, penetrations, and rim joists as needed. We correct or replace Johns Manville material to manufacturer spec. We do not blow new insulation over unsealed surfaces.
6. 6
   Post-test and documentation. We run the blower door again. You get a printed page with before-and-after CFM50, before-and-after air changes per hour at 50 Pascals, and photos of the work. The R-value tells you how slow heat moves through the material - the blower-door number tells you whether any of that matters.

Before

After

What Johns Manville Home Energy Audit Costs in San Marcos

Most Johns Manville home energy audits in San Marcos fall between $275 and $550. A 1,200-square-foot home with accessible attic and no duct testing typically runs $275-$350. A 2,400-square-foot home with crawl space, duct-blaster testing, and thermal imaging of multiple zones runs $450-$550.

What moves the price: home size, number of conditioned zones, whether we test duct leakage to outside, and whether insulation removal is needed before we can access air-leakage sites. We also offer a Free Second Opinion on any written estimate from another contractor - bring us their scope and we will read it with you line by line.

Every audit includes the Documented Photo Record at no extra charge. Call (737) 337-8049 for a free estimate - your written price arrives before any work starts.

Why San Marcos Homeowners Call Topside Attic Insulation San Marcos for Johns Manville Work

We are an independent Johns Manville service provider, not affiliated with or authorized by Johns Manville, which means we work across product lines without manufacturer pressure to push one solution. Wes Okafor, who trained in building science at Dawson Technical Institute and has spent over two decades diagnosing why attics fail, runs blower-door tests before and after every job and hands customers a single printed page with their air-changes-per-hour figure.

Our 365-Day Done Right Promise applies to all work. Our materials come from Johns Manville, Owens Corning, Knauf, Rockwool, and others - no proprietary lock-in. We also service Reflectix radiant barrier systems when they are part of the envelope assembly. Calls are answered by a live person 24/7. Background-checked, uniformed technicians. Written price before any work starts, always.

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