Johns Manville Insulation Removal & Replacement in Canyon Lake: What to Know First
We provide independent Johns Manville insulation removal and replacement in Canyon Lake, typically completing attic jobs in one day with a written price delivered before any work starts. Most removal-and-replace projects in the Canyon Lake area run between $2,800 and $5,400 depending on attic square footage, contamination level, and whether air sealing is needed beneath the old material. Call (737) 227-6219 for a free estimate with a written scope and guaranteed price.
This page is for homeowners who have identified Johns Manville insulation in their attic, walls, or crawl space and need it removed due to age, moisture damage, rodent contamination, or energy-performance failure. We are an independent Johns Manville service provider, not affiliated with or authorized by Johns Manville Corporation.
How Johns Manville Products Fail - and How We Fix Them
- JM Spider Custom Insulation (blown-in fiberglass) compacts in Canyon Lake’s heat cycles. The interlocking fiber design loosens after 8-12 years in attics that hit 140°F in July, settling to half its labeled R-value near the eaves where roof deck heat is most intense. We remove the compacted material with commercial HEPA vacuums, then install replacement blown-in at proper depth with baffles to maintain airflow and prevent repeat settling.
- JM Climate Pro batts (faced fiberglass) delaminate when lake-area humidity breaches the vapor barrier. Canyon Lake’s spring humidity spikes and occasional roof leaks from wind-driven rain on the Hill Country edge push moisture through compromised kraft facing, causing the facing to separate and mold at the top plate. We strip the batts, treat the substrate with antimicrobial if needed, and replace with unfaced batts plus a separate vapor retarder sized to the seasonal dew point here.
- JM Formaldehyde-free batts pre-2015 off-gas binding agents that attract rodents. Early formaldehyde-free formulations used plant-based binders that smell like food to roof rats, a persistent problem in Canyon Lake’s lakeside and wooded lots. We remove contaminated sections, seal entry points with steel mesh, and reinstall current-formulation JM batts or switch to mineral wool if the customer prefers.
- JM blown-in cellulose (subcontracted production years) holds moisture after plumbing leaks. Some Canyon Lake homes built 2008-2014 received JM-labeled cellulose that was actually produced by regional partners; the fiber density varied and trapped water from slow pipe leaks above hall bathrooms. We remove the sodden material, dry the deck with commercial dehumidification, and replace with specified-density fiberglass or treat and re-blow only if the customer requests cellulose specifically.
- JM AP Foil-faced polyiso boards (crawl space applications) lose adhesion at the foil layer. In Canyon Lake’s limestone-crawl homes, ground moisture wicks up the foundation wall and degrades the foil-to-foam bond, creating an air gap that nullifies the R-value. We remove the boards, apply a masonry-compatible adhesive and mechanical fasteners for the replacement, and add a vapor barrier on the ground if one is missing.
Our Johns Manville Insulation Removal & Replacement Process
- 1
Call and schedule. A live person answers 24/7. We ask about the home’s age, the insulation type if known, and any symptoms (odors, high bills, visible damage). We schedule a site visit in Canyon Lake within 48 hours.
- 2
On-site diagnostic. Wes Okafor or a lead technician inspects the attic or crawl space, identifies the Johns Manville product line by label or fiber characteristic, and runs a blower-door test - a pressurization reading that shows, in one number, how much conditioned air the house is losing through gaps before any insulation is touched.
- 3
Written price and scope. Under Haven Standard Clause 1: flat price, written scope, written warranty before anyone lifts a tool. We specify OEM Johns Manville replacement or an equivalent-performing alternative from Owens Corning, Knauf, or Rockwool if the customer prefers.
- 4
Removal and air sealing. We HEPA-vacuum or bag the old material, seal top plates, can lights, and penetrations with fire-rated caulk and foam, then re-run the blower-door to confirm the envelope is tight. Seal the leaks first. Then insulate. The report tells you whether it worked.
- 5
Replacement and documentation. New insulation is installed to labeled depth or R-value, with photo documentation at each stage. The customer receives a printed pre- and post-install report with blower-door numbers, photos, and warranty terms.
- 6
Cleanup and 365-Day Done Right Promise. We leave the attic cleaner than we found it. If anything fails within a year, we return and make it right.
Before
AfterWhat Johns Manville Insulation Removal & Replacement Costs in Canyon Lake
Most attic removal-and-replace jobs in Canyon Lake homes run between $2,800 and $5,400. Crawl space projects typically fall between $3,200 and $6,100 because of limited access and the vapor barrier work that usually accompanies them.
| Scenario | Typical Range |
|---|---|
| Standard attic removal + JM fiberglass replacement, 1,200-1,800 sq ft | $2,800-$3,900 |
| Attic with rodent contamination + sanitation + replacement | $3,800-$5,400 |
| Crawl space JM board removal + ground vapor barrier + replacement | $3,200-$6,100 |
| Air sealing package (blower-door verified) added to any job | $800-$1,600 |
What moves the price: attic square footage, depth of existing material, contamination requiring PPE and HEPA filtration, accessibility (steep roof pitch, tight scuttle), and whether the old product contains vermiculite or asbestos requiring abatement referral. We also service Reflectix and other brands if your home has mixed materials.
Every estimate is free, written, and guaranteed not to change unless the scope changes. Call (737) 227-6219 to schedule.
Why Canyon Lake Homeowners Call Topside Attic Insulation Canyon Lake for Johns Manville Work
We’ve removed and replaced Johns Manville products in Canyon Lake homes since 2016, including full attic retrofits on homes near the Cranes Mill Road corridor where radiant heat gain through under-insulated roof decks is about as predictable as a July afternoon on the lake. Our crews know the difference between JM Spider and Climate Pro by fiber structure, not just label, and we stock both OEM Johns Manville and equivalent-performing alternatives so you’re never locked into a single supplier.
Every job gets the Haven Standard: written price first, documented photo record during, and printed blower-door report after. The 365-Day Done Right Promise applies to all completed work. Calls are answered by a live person 24/7, and technicians are background-checked and uniformed.
FAQs
No - the original Johns Manville product warranty on installed insulation expired when the material was first placed in service, typically 10-20 years ago depending on the product line. Our replacement work carries its own 365-Day Done Right Promise backed by written warranty. Call (737) 227-6219 for a free estimate.
We source current Johns Manville products directly through regional distributors, and we also install equivalent-performing batts and blown-in from Owens Corning, Knauf, and Rockwool if you prefer. We do not claim exclusive or preferred status with any brand. Your written scope specifies exactly what goes in.
Spot repair is rarely cost-effective for attic insulation because new material layered over old creates thermal bridges and hides underlying air leaks. Full removal lets us seal the envelope properly and verify with a blower-door test. Most Canyon Lake homeowners find the total cost difference is under $800 compared to partial replacement, with far better performance. Call (737) 227-6219 and we’ll price both approaches.
Most Canyon Lake attic jobs are completed in one day; crawl space or heavily contaminated projects may take two. We schedule within 48 hours of your call and arrive on time with a named technician. You’ll get a text when they’re on the way.
A printed packet with before-and-after blower-door readings (CFM50), time-stamped photos of each stage, the written scope you approved, and your warranty terms. This is standard on every job, not available on request. You know what leaving looks like before we arrive.
Written by Wes Okafor, Owner & Lead Insulation Technician, Topside Attic Insulation Canyon Lake at Topside Attic Insulation Canyon Lake, serving Canyon Lake and nearby areas.