Johns Manville Insulation Removal & Replacement Nationwide

Johns Manville Insulation Removal & Replacement in San Marcos: What to Know First

We provide independent Johns Manville insulation removal and replacement in San Marcos, typically completing attic jobs in one day with a written price delivered before any work starts. Most removals and replacements run between $2,800 and $6,400 depending on contamination level, attic square footage, and whether air sealing at the top plate is required first. Call (737) 337-8049 for a free estimate with a written scope.

Call (737) 337-8049

This page is for homeowners who have found Johns Manville batts, blown-in, or vermiculite insulation in their San Marcos attic and need it removed safely and replaced with material that performs. We are an independent Johns Manville service provider, not affiliated with or authorized by Johns Manville.

How Johns Manville Products Fail - and How We Fix Them

• JM Spider blown-in fiberglass settles below labeled R-value in San Marcos attics. The product is engineered to achieve its rated thickness at installation, but in the Hill Country’s wide temperature swings, the interlocking fiber structure breaks down faster than in milder climates. We remove the settled material and replace with a denser blown-in product, documenting the depth with photos at multiple attic locations.
• JM Formaldehyde-free batts degrade at the edges where roof leaks start. The kraft-facing adhesive fails when humidity spikes above 70%, which happens regularly in San Marcos spring storms. We cut out the degraded sections, map the moisture source, and replace with unfaced batts after the roof leak is resolved - never covering a leak with new material.
• JM vermiculite from pre-1990 installations may contain asbestos and requires abatement-protocol removal. We do not test in-house; we coordinate with a third-party lab and, if positive, execute full containment removal with negative air pressure and HEPA filtration. Replacement is delayed until clearance sampling passes.
• JM ComfortTherm batts compress in attics with heavy foot traffic from HVAC contractors. The encapsulated plastic facing tears when walked on, breaking the vapor barrier. We remove the compressed sections, install catwalks over the new insulation, and replace with the same product only if the attic access pattern changes.
• JM Climate Pro loose-fill creates voids around recessed can lights that were never properly sealed. The material blows away from heat sources, leaving bare drywall around IC-rated fixtures. We remove the surrounding fill, seal the can light housings to the drywall with fire-rated caulk and cover, then reinstall insulation to a uniform depth.

Our Johns Manville Insulation Removal & Replacement Process

1. 1
   Attic inspection and contamination assessment. We photograph the existing Johns Manville product, note the series if identifiable, and test for moisture content in the sheathing with a pinless meter.
2. 2
   Blower-door test before any removal. This pressurization reading shows, in one number, how much air the building envelope is losing. We need this baseline to prove the improvement later.
3. 3
   Written price and scope delivered. Under Haven Standard Clause 1: flat price, written scope, written warranty before anyone lifts a tool. No work starts without it.
4. 4
   Air sealing first, then removal. We seal top plates, can lights, and penetrations before disturbing existing insulation. Blowing new material over an unsealed attic floor is something we do not do.
5. 5
   Removal, disposal, and replacement with documented depth verification. We photograph the new insulation depth at minimum six locations and provide the after blower-door number on a single printed page.
6. 6
   365-Day Done Right Promise activation. The written warranty and photo record are delivered before the crew leaves. If it’s not done right, we make it right.

Before

After

What Johns Manville Insulation Removal & Replacement Costs in San Marcos

Price moves with attic accessibility (scissor truss vs. conventional), sheathing condition, and whether the HVAC ductwork must be temporarily relocated. We also service Reflectix radiant barrier systems when those are part of the same envelope upgrade.

Call (737) 337-8049 for a free estimate. Estimates are free, the price is written, and there is no obligation.

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

We have sealed and insulated over 9,000 homes since 2016, and the ones in San Marcos keep teaching us something specific. The slab-on-grade homes near the Texas State University corridor, built in the 1970s through 1990s, routinely have Johns Manville batts installed directly over unsealed top plates. The R-value tells you how slow heat moves through the material - the blower-door number tells you whether any of that matters. We publish the before-and-after on every job so the improvement is a number, not a claim.

Wes Okafor, who leads this crew, trained in building science at Dawson Technical Institute and has spent two decades diagnosing why attics fail rather than filling them. Every technician is background-checked and uniformed. A live person answers calls 24/7. Materials come from Johns Manville, Owens Corning, Knauf, Rockwool, and others - no proprietary lock-in means we specify what performs, not what we’re obligated to sell.

FAQs