Johns Manville Insulation Removal & Replacement in Los Angeles: What to Know First
We provide independent Johns Manville insulation removal and replacement in Los Angeles, typically completing most attic jobs in one to two days with a written price locked before any work starts. Most Johns Manville removal and replacement projects in Los Angeles run between $2,800 and $6,500 depending on contamination level, attic accessibility, and whether the original installation was a blown-in fiberglass system like Climate Pro or a battted Kraft-faced product. This page is for homeowners who can identify Johns Manville labeling in their attic, suspect the material is compromised, and want a crew that understands the difference between a JM Spider blown system and a formaldehyde-containing product from the 1990s. Call (628) 226-1097 for a free written estimate with no obligation.
How Johns Manville Products Fail - and How We Fix Them
- Climate Pro blown-in fiberglass settling below labeled R-value. We see this in Los Angeles homes built between 2008 and 2016 where Climate Pro was specified at R-38 but has compressed to R-26 or lower in the center of the attic, leaving bare spots near eaves. The fix is complete removal, air sealing of top plates and can-light penetrations, then reinstalling to true depth with current JM formaldehyde-free blown fiberglass or an alternative like Owens Corning AttiCat if the homeowner prefers.
- JM Formaldehyde-free batts with Kraft facing degradation in coastal zones. In neighborhoods like Venice and San Pedro where marine layer moisture penetrates roof sheathing, the asphalt-impregnated Kraft paper facing delaminates and sags, creating a vapor trap. We remove the compromised batts, assess whether the roof deck has accumulated moisture, and replace with unfaced batts or blown product after sealing attic bypasses.
- Pre-2005 JM products with potential vermiculite cross-contamination. Some Los Angeles homes received JM insulation during periods when vermiculite sourcing overlapped with Libby, Montana material. We test before disturbing, and if positive, we deploy EPA RRP containment and HEPA-negative-air removal rather than standard vacuum extraction. This is not a corner to cut.
- Spider blown-in system installed over unsealed recessed cans. The Spider system - a loose-fill fiberglass engineered for sidewall application - was occasionally blown into attics by installers who skipped air sealing. Conditioned air escapes through the can housings, carrying Spider fibers into the living space over years. We remove the contaminated layer, seal every penetration with fire-rated foam and rigid baffles, then reinsulate.
- JM polyiso board (AP Foil-Faced) in unvented assemblies with condensation. In Los Angeles hillside homes with conditioned attics, AP Foil-Faced polyiso installed without proper ratio of exterior to interior insulation has caused summer condensation on the cold side of the foil. We remove the water-damaged boards, calculate the correct assembly using local dew-point data, and replace with a properly proportioned system that may include Rockwool or spray foam depending on the roof structure.
Our Johns Manville Insulation Removal & Replacement Process
- 1
Written price and scope before arrival. Under Haven Standard Clause 1, you receive a flat price, written scope, and written warranty before anyone lifts a tool. No exceptions.
- 2
Blower-door test and attic diagnostic. We pressurize the house to measure CFM50 - the rate of air leakage through the building envelope - and photograph every condition we find, including manufacturer labels on existing JM product.
- 3
Air sealing before any removal begins. Seal the holes first. Then measure the R-value. In that order. Top plates, wire penetrations, chimney chases, and recessed-can housings get sealed with fire-rated foam, rigid baffles, and metal flashing where required by Los Angeles building code.
- 4
Contained removal with HEPA filtration. We use commercial-grade insulation vacuums with HEPA-negative-air machines for the attic space, bagging JM material for proper disposal. If vermiculite is suspected, EPA containment protocols apply.
- 5
Replacement with documented R-value and blower-door verification. New insulation goes in to specified depth with depth markers photographed. We run a second blower-door test and hand you a written summary showing before-and-after ACH50, installed R-value, and product data sheets.
- 6
365-Day Done Right Promise activation. If it’s not done right, we make it right. Your documented photo record and written warranty are delivered before the crew leaves.
Before
AfterWhat Johns Manville Insulation Removal & Replacement Costs in Los Angeles
| Scenario | Typical Range | What Moves the Price |
|---|---|---|
| Standard JM blown fiberglass removal + replacement, 1,200 sq ft attic | $2,800 - $4,200 | Attic accessibility, presence of decking or storage platforms, number of can-light penetrations to seal |
| JM batt removal with Kraft facing degradation + air sealing | $3,500 - $5,200 | Extent of facing delamination, roof deck moisture remediation, replacement product selection |
| Spider system removal with contamination + full air sealing | $4,200 - $6,500 | Depth of existing material, contamination level, need for baffle installation at soffits |
| Vermiculite-positive removal with EPA containment | $6,000 - $11,000+ | Lab confirmation timeline, third-party air clearance testing, disposal at licensed facility |
Most Los Angeles homes fall in the $3,200-$4,800 band for a straightforward JM removal and replacement with proper air sealing. Call (628) 226-1097 for an exact written quote - estimates are free, and we provide a Free Second Opinion on any competing written estimate you bring us.
Why Los Angeles Homeowners Call Topside Attic Insulation Los Angeles for Johns Manville Work
We’ve removed and replaced Johns Manville products in Los Angeles homes since 2016, including full retrofits in the Leimert Park corridor where unvented knee walls and bypassed soffit chases are still common. Wes Okafor and our crew know the difference between a Spider system and a Climate Pro install, and we don’t guess at R-value - we measure it. Every applicable job publishes before-and-after blower-door numbers so you can verify the air-sealing result you paid for. We’re also certified to work with Reflectix and other major brands, so if your assembly benefits from a hybrid approach, we won’t force a single-manufacturer solution. Calls are answered by a live person 24/7, and your technician arrives uniformed, background-checked, and named in a text when they’re on the way.
FAQs
Removing installed insulation does not affect Johns Manville’s limited product warranty, which covers manufacturing defects in the original material, not installation or later modification. As an independent Johns Manville service provider, we document the original product label and install date when visible, and we warranty our own workmanship under the 365-Day Done Right Promise. Call (628) 226-1097 if you’d like us to review what documentation exists in your attic.
You cannot tell by visual inspection alone - vermiculite looks like small, pebbly granules and was sold under multiple brand names. If your Los Angeles home was insulated between the 1920s and early 1990s, we test a sample before disturbing anything. If positive, EPA RRP containment and licensed disposal are required. This adds cost but protects your indoor air quality and legal liability. Call (628) 226-1097 to schedule a no-charge attic assessment.
In most Los Angeles cases, no - and we won’t do it. Blowing new material over settled, contaminated, or improperly installed JM product masks the real problem: unsealed air leaks that degrade performance and can distribute fibers or rodent waste into your living space. The correct sequence is removal, air sealing, then replacement to a measured, documented R-value. We provide written pricing for both approaches so you can compare.
Most standard jobs in Los Angeles are completed in one to two days after you approve the written scope. Vermiculite-positive jobs require third-party lab confirmation and air clearance testing, which typically extends the timeline to five to seven business days. We do not start work without a written price, and we do not promise speeds we cannot document.
No - we source materials from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber with no proprietary lock-in. If your assembly performs better with a different product, we’ll specify it in the written scope with data sheets attached. The goal is a measured result, not a brand match.
Ready for a written price before any work starts? Call (628) 226-1097 or text us to schedule your free attic assessment. We’ll bring the blower door, the camera, and a flat quote you can compare.
Written by Wes Okafor, Owner & Lead Insulation Technician, Topside Attic Insulation Los Angeles at Topside Attic Insulation Los Angeles, serving Los Angeles and nearby areas.