Johns Manville Wall Insulation in Boerne: What to Know First
We provide independent Johns Manville wall insulation service in Boerne, with most jobs scheduled within 48 hours and completed in a single day. Every job starts with a written price - no work begins without it - and ends with a Documented Photo Record plus before-and-after blower-door numbers when air sealing is part of the scope. If your walls contain Johns Manville batts, blown-in fiberglass, or formaldehyde-free mineral wool that has settled, compressed, or failed to meet its labeled R-value, we diagnose the failure mode first, then recommend the right fix. Call (830) 529-7780 for a free estimate with a written price delivered before any work starts.
How Johns Manville Products Fail - and How We Fix Them
- JM Spider blown-in fiberglass settling in stud cavities. Spider’s engineered adhesive is designed to cling without netting, but in Boerne’s humidity swings - 80% summer mornings dropping to 30% by afternoon - the bond can degrade in walls with chronic moisture drive. We remove the settled material, seal top plates and electrical penetrations with acoustic sealant, then reinstall at proper density or switch to a stabilized blown-in system.
- JM Climate Pro formaldehyde-free batts compressing below labeled thickness. Climate Pro’s batts are itch-free and easy to handle, which means homeowners or handymen often stuff them into cavities too tight. Compressed fiberglass loses 30-50% of its R-value. We extract the compressed batts, verify the cavity depth against the ACCA Manual J load calculation, and install at the specified thickness with proper friction fit.
- JM mineral wool (Rock Wool) moisture retention in south-facing walls. Johns Manville’s mineral wool line is hydrophobic at the fiber level, but the facing or the cavity air seal is what actually stops bulk water. In older Boerne homes near the Cibolo Nature Center, we’ve found rock wool holding moisture where stucco cracks allowed wind-driven rain past deteriorated building paper. We air-seal the cavity, replace water-damaged insulation, and document the repair with photos.
- JM pre-cut batts leaving gaps at studs and utilities. Pre-cut batts speed installation, but wall cavities are never truly uniform. A 1/2-inch gap alongside a stud creates a thermal bypass that negates the insulation value. We field-cut every piece to fit, or switch to dense-pack blown-in for irregular cavities.
- JM blown-in fiberglass migrating away from top plates in balloon-framed walls. In Boerne’s 1920s-1950s homes, balloon framing creates continuous wall cavities from foundation to eave. Without blocking, blown-in fiberglass settles over decades, leaving a cold zone at the top plate. We install fire-blocking baffles, dense-pack the cavity to prevent future settlement, and seal the top plate to the attic floor.
Our Johns Manville Wall Insulation Process
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Call and scope. A live person answers 24/7. We schedule a site visit, and Wes Okafor or a technician arrives with a blower door, infrared camera, and the ACCA Manual J reference.
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Diagnostic testing. We run a blower-door test - a pressurization reading that shows, in one number, how much air your building envelope is losing. Infrared imaging identifies missing or settled Johns Manville insulation in wall cavities.
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Written price and scope. Under Haven Standard Clause 1: flat price, written scope, written warranty before anyone lifts a tool. No exceptions.
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Air sealing first. Seal the envelope first. Then fill it. We seal top plates, electrical boxes, plumbing penetrations, and can lights with fire-rated acoustic sealant and specialized gaskets.
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Insulation installation. We select OEM Johns Manville replacement or quality aftermarket equivalent based on cavity condition, moisture history, and your budget. No proprietary lock-in - we also source from Owens Corning, Knauf, Rockwool, and others.
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Verification and documentation. Final blower-door test, Documented Photo Record delivered, and before-and-after pressure-differential report in pascals so the numbers are on paper.
What Johns Manville Wall Insulation Costs in Boerne
Most Johns Manville wall insulation jobs in Boerne run between $2,800 and $6,400 for a typical 2,000-square-foot home, depending on cavity access and the condition of existing material. Here’s what moves the price:
- Drill-and-fill dense-pack fiberglass: $1.80-$2.60 per square foot of wall area. Requires exterior siding removal or interior drywall repair.
- Injection foam (open-cell) for settled JM Spider: $3.20-$4.50 per square foot. Higher density, better air sealing, no future settlement.
- Interior wall soundproofing with JM mineral wool: $4.50-$6.80 per square foot. Includes resilient channel and double-layer drywall where specified.
- Air sealing package (required before insulation): $800-$1,800 depending on top plate access and penetration count.
Three factors push the high end: balloon framing requiring fire-blocking, stucco exterior requiring surgical removal and replacement, and water-damaged cavities needing mold remediation before new insulation. We provide a Free Second Opinion on any written estimate from another contractor. Call (830) 529-7780 - estimates are free, and the written price is delivered before any work starts.
Why Boerne Homeowners Call Topside Attic Insulation Boerne for Johns Manville Work
We’ve sealed and insulated over 9,000 homes since 2016, and every one began with a written price and ended with a documented record. Our crews know Johns Manville product lines from Spider to Climate Pro to mineral wool - not generically, but by their specific failure modes in Hill Country construction. When a Johns Manville part is backordered or discontinued, we source quality aftermarket equivalent from our multi-brand inventory, including Reflectix radiant barrier products where appropriate. The 365-Day Done Right Promise applies to all completed work: if it’s not done right, we make it right. Background-checked, uniformed technicians. Live person answers the phone 24/7. No voicemail loops.
FAQs
No - product warranties from Johns Manville cover material defects regardless of who installs them, provided the product was applied to manufacturer specifications. We document our installation with photos and follow published density and coverage charts. For labor warranty, our 365-Day Done Right Promise covers our workmanship directly. Call (830) 529-7780 if you have a specific warranty concern - we’ll review the paperwork with you.
Most jobs are scheduled within 48 hours of your call, and emergency comfort issues - a south-facing room that won’t hold temperature, for example - can often be addressed same-day. We serve Boerne and nearby areas including the stretch of older homes near the Cibolo Nature Center where stack-effect air leakage is common. Call (830) 529-7780 to check today’s availability - estimates are free.
Repair is cheaper when the existing material is dry, uncompressed, and simply settled in a accessible cavity - typically $800-$1,800 to dense-pack additional blown-in fiberglass. Replacement is necessary when batts are water-damaged, compressed below 75% of labeled thickness, or contaminated. We diagnose this with infrared imaging and cavity probes, then give you both numbers in writing. Call (830) 529-7780 for a free estimate.
We stock common Johns Manville blown-in fiberglass and batt products for Boerne’s typical wall cavities. Specialty items - formaldehyde-free mineral wool in non-standard thicknesses, for example - typically arrive within 2-3 business days from San Antonio distribution. We also carry quality aftermarket equivalents from Owens Corning, Knauf, and Rockwool if your timeline is tight. We’ll tell you exactly what’s in stock when we deliver your written price.
You receive three things: a Documented Photo Record of the work, a written invoice matching your pre-approved price, and - on jobs involving air sealing - a printed before-and-after blower-door report showing the pressure differential in pascals. Under Haven Standard, you get the numbers on paper, not just a claim. Call (830) 529-7780 to schedule.
Written by Wes Okafor, Owner, Topside Attic Insulation Boerne at Topside Attic Insulation Boerne, serving Boerne and nearby areas.