Owens Corning Insulation Removal & Replacement in San Marcos: What to Know First
We provide independent Owens Corning insulation removal and replacement in San Marcos, with most jobs completed in one day and a written price delivered before any work starts. A typical attic removal and replacement for a 1,500-square-foot home runs between $2,800 and $4,200, though vermiculite or heavily contaminated jobs run higher. We are not affiliated with or authorized by Owens Corning - we are an independent service provider who sources materials from Owens Corning, Johns Manville, Knauf, Rockwool, and other manufacturers so you are never locked into a single product line. This page is for San Marcos homeowners who need old, failed, or contaminated Owens Corning insulation removed and replaced with documented performance results. Call (737) 337-8049 to schedule a free estimate.
How Owens Corning Products Fail - and How We Fix Them
- Owens Corning AttiCat blown-in fiberglass settles below labeled R-value in San Marcos attics. The loose-fill PINK Fiberglas Insulation (L77 and L38 series) loses 15 to 25 percent of its installed thickness over seven to ten years in our climate, where summer attic temperatures exceed 150°F and accelerate compression. We remove the settled material, air-seal the attic floor at top plates and can-light penetrations, then reinstall to true depth with a settled-density calculation - not the bag-count method some crews use.
- Owens Corning FOAMULAR rigid board degrades at the edges in crawl spaces with seasonal moisture swings. The XPS boards (pink, 150 and 250 series) absorb water at the cut edges when San Marcos spring humidity spikes and winter slab-edge condensation forms. We remove the degraded boards, assess the vapor barrier condition, and replace with either fresh FOAMULAR with sealed edges or switch to a moisture-tolerant alternative like Rockwool Comfortboard if the crawl space cannot be fully encapsulated.
- Owens Corning EcoTouch batts fail at the kraft-paper facing in rodent-affected attics near the Blanco River corridor. The paper vapor retarder becomes a food source and nesting substrate; we see this in older homes off CM Allen Parkway and in the Dunbar Historic District. We remove contaminated batts, sanitize the framing, rodent-proof with steel mesh at entry points, and replace with unfaced batts or blown-in fiberglass - never reinstalling paper-faced product in a previously infested space.
- Owens Corning ProCat loose-fill clogs around recessed can lights that were never properly sealed. The fine-glass strands pack against hot fixtures, creating voids and a potential ignition path in pre-2010 installs. We extract the packed material, install fire-rated covers or Tenmat enclosures over the cans, seal with fire-stop caulk, then redistribute insulation evenly.
- Owens Corning QuietZone acoustic batts in cathedral ceilings compress from foot traffic during HVAC service. These batts are not designed for walk-on applications, yet San Marcos homes with package units in the attic routinely see them trampled flat. We remove the compressed sections, install catwalk decking over the new insulation, and replace with higher-density batts or a loose-fill system that tolerates occasional access.
Our Owens Corning Insulation Removal & Replacement Process

- 1
Site visit and blower-door test. We pressurize the house to measure CFM50 - the cubic feet per minute of air leakage at 50 pascals of pressure - so we have a baseline number before touching anything.
- 2
Written price and scope. Under Haven Standard Clause 1, you get a flat price, written scope, and written warranty before anyone lifts a tool. No exceptions.
- 3
Containment and removal. We isolate the work zone with poly sheeting, run negative air if contamination is present, and remove the failed Owens Corning product to bag or truck without dragging it through living spaces.
- 4
Air sealing before insulation. We seal top plates, wire and pipe penetrations, can lights, and chimney chases. The R-value tells you how slow heat moves through the material - the blower-door number tells you whether any of that matters.
- 5
Replacement and verification. We install the replacement insulation to manufacturer’s specified depth or density, then run a second blower-door test. You receive a single printed page showing before and after air-changes-per-hour so the improvement is a number, not a claim.
- 6
Documented Photo Record and cleanup. Every job closes with photos of the completed work, the blower-door readings, and a walk-through. The 365-Day Done Right Promise applies from that moment.
Before
AfterWhat Owens Corning Insulation Removal & Replacement Costs in San Marcos
| Job Type | Typical Range | What Moves the Price |
|---|---|---|
| Standard attic removal and replace (blown fiberglass) | $2,800 - $4,200 | Attic square footage, accessibility, whether air sealing is extensive |
| Contaminated insulation removal (rodent, mold, smoke) | $3,500 - $6,000 | Hazmat handling, sanitization, extent of soiling, disposal fees |
| Vermiculite removal (pre-1990 homes) | $8,000 - $15,000 | Lab testing for asbestos, abatement protocol, third-party clearance |
| Wall cavity removal and dense-pack replace | $4,500 - $7,500 | Number of walls, interior or exterior access, plaster vs. drywall |
| Crawl space removal and encapsulation prep | $3,200 - $5,800 | Crawl height, standing water history, vapor barrier condition |
These ranges reflect what we see in San Marcos homes built from the 1960s through the 2010s, from the slab-on-grade ranches near Texas State to the newer construction in Willow Creek. The only way to get your exact number is a site visit - estimates are free, and we provide a Free Second Opinion on any written estimate you have already received. Call (737) 337-8049.
Why San Marcos Homeowners Call Topside Attic Insulation San Marcos for Owens Corning Work

We have sealed and insulated over 9,000 homes since 2016, every one with a written price before work started and a documented record when the crew left. Wes Okafor, who grew up on Chicago’s South Side and trained in building science at Dawson Technical Institute, runs blower-door tests before and after every applicable job - then hands you the numbers on a single page. Our technicians are background-checked and uniformed; calls are answered by a live person 24/7, not a voicemail loop. Because we source from Owens Corning, Reflectix, Johns Manville, Knauf, Rockwool, and others, we recommend the material that fits your home’s condition, not the one that moves our inventory. The 365-Day Done Right Promise means if it is not done right, we make it right - backed by a written scope and written warranty delivered before anyone starts.
FAQs
No - product warranties cover manufacturing defects, not removal by an independent contractor. Owens Corning insulation warranties are typically limited to the original installation and do not extend to subsequent modifications. If you have a system warranty through a builder or insulation contractor, we will review the terms with you during our free estimate so you understand what applies. Call (737) 337-8049 to schedule.
We can source current Owens Corning products including AttiCat, ProCat, EcoTouch, and FOAMULAR lines, or we can recommend an equivalent or better-performing alternative from Knauf, Rockwool, or Johns Manville if your attic conditions suggest it. We do not lock you into any single manufacturer. Call (737) 337-8049 and we will walk through the options with your written estimate.
We add on top only if the existing insulation is dry, uncontaminated, and the blower-door test shows the attic floor is already well-sealed. In San Marcos, we more often find that old Owens Corning batts or blown-in have settled below half their labeled R-value, or that rodent activity, roof leaks, or contractor foot traffic have compromised the layer. We remove in those cases because new insulation over damaged old insulation traps problems and hides them from the next inspector. Call (737) 337-8049 for a free assessment.
Most jobs are scheduled within three to five business days of estimate approval, and the work itself takes one day for standard attic removals, two days for contaminated or vermiculite jobs. We do not manufacture urgency - we keep a schedule we can keep. Call (737) 337-8049 to check current availability.
You receive a Documented Photo Record of the completed work, the written scope we agreed to, and on air-sealing jobs, the before-and-after blower-door readings in CFM50 and air changes per hour. This is included on every job, not available on request. Haven Standard: Have it in writing. Call (737) 337-8049 to start your file.
Written by Wes Okafor, Owner, Topside Attic Insulation San Marcos at Topside Attic Insulation San Marcos, serving San Marcos and nearby areas.