Johns Manville Insulation Removal & Replacement in Boerne: What to Know First
As an independent Johns Manville service provider, we remove and replace failed Johns Manville insulation systems in Boerne homes, typically completing attic jobs in one to two days with a written price fixed before any work starts. Most Johns Manville removal and replacement projects in the Hill Country run between $2,800 and $6,400 depending on square footage, contamination level, and whether the attic floor needs full air sealing before new material goes in. If you’re seeing settled batts, compressed blown-in, or rodent-damaged JM product in your attic, call (830) 529-7780 - we answer live, 24/7, and we’ll read any competing written estimate with you for free.
How Johns Manville Products Fail - and How We Fix Them
- JM Spider blown-in fiberglass settles below labeled R-value in Boerne’s heat-cycling attics. Spider’s adhesive-activated fibers lose loft after repeated 140°F summer days in unvented Hill Country attics. We remove the compacted material, seal top plates and can-light penetrations, then replace with fresh blown-in at proper depth for the target R-value.
- JM ComfortTherm batts degrade where roof leaks introduce moisture. The encapsulated facing on ComfortTherm traps water against the paperless fiberglass core, creating hidden compression zones near chimney saddles and valley flashing. We strip the damaged batts, photograph the deck condition for your record, and install replacement product only after the leak source is resolved.
- JM Formaldehyde-free batts attract rodent nesting more aggressively than denser mineral wool alternatives. In the oak-heavy neighborhoods near Cibolo Creek, we’ve pulled JM batts shredded into maternity colonies. We remove the contaminated material, rodent-proof entry points with galvanized mesh, then discuss whether Rockwool or denser fiberglass makes sense for the replacement.
- JM blown-in systems installed before 2015 often lack proper attic-floor air sealing underneath. The insulation performed adequately until thermal bypasses through electrical chases and top plates created localized cold spots that condensed Hill Country humidity. We remove the old JM, perform blower-door-guided air sealing, then reinstall - this time with measured results.
- JM mineral wool (Thermafiber) in cathedral ceilings shows thermal bridging where rafters weren’t properly baffled. The rigid batts compress at the rafter edge, dropping effective R-value exactly where heat gain is highest. We remove the compromised sections, install proper vent baffles for continuous airflow, then replace with correctly cut pieces.
Our Johns Manville Insulation Removal & Replacement Process
- 1
Written price before arrival. We review photos or visit your Boerne home, scope the JM product type, contamination level, and access difficulty, then deliver a flat price and written scope - no work starts without both.
- 2
Blower-door baseline. On applicable jobs, we run a pressurization test - a reading that shows, in one number, how much conditioned air your building envelope is losing. We hand you the CFM50 figure on paper.
- 3
Contained removal. We set up negative air pressure, HEPA filtration, and sealed bagging for your specific JM product. Fiberglass, mineral wool, and contaminated material each follow distinct disposal paths per Kendall County regulations.
- 4
Air sealing before replacement. Seal the envelope first. Then fill it. We seal top plates, wire penetrations, can lights, and duct chases with fire-rated foam and acrylic sealant - documented with photos.
- 5
Replacement with measured results. We install your chosen replacement material, then re-test with the blower door. You receive before-and-after CFM50 readings, a photo record of the sealed penetrations, and the written warranty.
- 6
Cleanup and documentation. The crew vacuums the attic floor, removes all equipment, and leaves you with the printed pressure-differential report, photo documentation, and our 365-Day Done Right Promise in writing.
What Johns Manville Insulation Removal & Replacement Costs in Boerne
| Scenario | Typical Range | What Moves Price |
|---|---|---|
| Standard JM fiberglass batt removal, clean attic, replace with new batts | $2,800 - $4,200 | Attic square footage, pitch difficulty, whether decking needs repair |
| JM blown-in removal with full air sealing and replacement | $4,000 - $6,000 | Depth of existing material, number of top plates, can-light count |
| Contaminated JM removal (rodent, moisture, or mold) | $3,500 - $6,400 | Hazmat handling requirements, extent of deck staining, odor treatment |
| JM mineral wool in cathedral ceiling replacement | $5,200 - $8,500 | Baffle installation, roof pitch, accessibility |
These are real ranges for Boerne homes we’ve worked - not teaser rates. The written price we give you includes disposal, air sealing labor, material, and the blower-door verification. No line item gets added after you sign the scope. Call (830) 529-7780 for your exact figure; estimates are free.
Why Boerne Homeowners Call Topside Attic Insulation Boerne for Johns Manville Work
We’ve removed Johns Manville product from attics near Main Street, from the older ranch homes off Esser Road, and from new construction near Fair Oaks Ranch where the specified JM batts were installed before the envelope was sealed. Wes Okafor runs a blower-door test on every applicable job, then hands homeowners a printed pressure-differential report in pascals so the improvement is on paper, not promised. Our crews carry Johns Manville, Owens Corning, Knauf, Rockwool, and Reflectix materials - no proprietary lock-in means we recommend what performs for your specific attic, not what moves a particular inventory. The 365-Day Done Right Promise applies to every removal and replacement, backed by a written scope and warranty delivered before anyone lifts a tool. Calls are answered by a live person, 24/7.
FAQs
Johns Manville’s product warranty covers manufacturing defects, not installation or removal by third parties. As an independent Johns Manville service provider, we document the condition of your existing JM product with photos before removal, which preserves your ability to file a material defect claim if the failure is factory-related. For warranty-safe replacement, we install new JM product to manufacturer spec or recommend an equivalent if JM no longer suits your application. Call (830) 529-7780 and we’ll review your specific product line.
Most standard attic removals and replacements are completed in one to two days; contaminated or cathedral-ceiling jobs may run to three. We schedule within 48 hours of your written approval, and our crew arrives with the specified JM or alternative material already loaded - no supply-house delays. Same-week scheduling is typical in Boerne and Kendall County. Call (830) 529-7780 to confirm current availability.
Spot repair is rarely cost-effective for blown-in JM product because matching settled density is nearly impossible, and the thermal bridge at the repair edge undermines performance. For batts, isolated replacement can work if the surrounding material tests at full loft and the air barrier is intact. We give you both numbers in writing - repair scope and full replacement - so you decide with actual figures, not a sales pitch. Free second opinions on any written estimate from another contractor.
We stock current JM lines including Spider, ComfortTherm, and Thermafiber, and we source discontinued grades through authorized distributors when code or matching requirements demand it. If your original JM product is obsolete or underperforming, we’ll show you the spec sheets for equivalent or improved alternatives from Johns Manville, Owens Corning, or Rockwool - your choice, no pressure. We don’t claim exclusive status with any manufacturer.
You get a Documented Photo Record of the sealed penetrations and completed work, the written warranty, and on applicable jobs the before-and-after blower-door readings in CFM50 and pascals. This is standard on every visit, not available on request. Under Haven Standard: Have it in writing - you leave with the proof of what was done and how it performed.
Written by Wes Okafor, Owner, Topside Attic Insulation Boerne at Topside Attic Insulation Boerne, serving Boerne and nearby areas.