Johns Manville Insulation Removal & Replacement in Glendale: What to Know First
Johns Manville insulation removal and replacement in Glendale typically runs $1,800 to $4,600 for a full attic, with most jobs completed in one to two days. We’re an independent Johns Manville service provider, not a manufacturer rep, so our job is to tell you what’s actually wrong with your insulation and whether it needs to go or can be repaired. This page is for Glendale homeowners dealing with water-damaged batts, rodent contamination, settled blown-in fiberglass, or JM insulation that’s simply stopped doing its job. If you’re not sure what you have up there, call (747) 246-7237 and we’ll walk through it with you.
Johns Manville Insulation in Glendale: What Actually Fails
The name Johns Manville has been on insulation since 1858, and Glendale attics are full of their products. We work on JM material every month, and here’s what we actually see when we climb up there.
- JM ComfortTherm batts with a torn or degraded vapor retarder. ComfortTherm is the kraft-faced line with a polyethylene vapor barrier. In Glendale’s dry summers, that facing can crack and peel after 15 to 20 years, especially in attics that hit 140°F in August. Once the facing fails, moist air moves through the batt and condenses in the cooler spots around the eaves. That’s when you get staining, mold, and reduced R-value. We pull the old batts, check the decking for moisture damage, and replace with fresh material plus proper air sealing.
- JM Spider blow-in fiberglass that settles below the top of the ceiling joists. Spider is a loose-fill system that works fine when installed at the right density, but a lot of older Glendale homes got a thin single pass. Once it compacts, your effective R-value drops well under the label. We remove the settled material, air-seal the attic floor, and blow in at the correct depth. You’d be surprised how many Glendale homes we find with R-19 spec’d but R-11 in the attic.
- Formaldehyde-free JM batts that got soaked from a roof leak. JM moved away from formaldehyde in residential products years ago, which is good for your indoor air. But fiberglass batts, formaldehyde-free or not, don’t like water. Once they wick moisture from a roof leak or a failed boot, the fibers clump and the batt loses its loft. No loft, no trapped air. No trapped air, no insulation. We trace the leak source first, then remove the affected batts, dry the cavity, and replace.
- Rodent damage in JM batt or loose-fill insulation. Rats and mice in Glendale don’t discriminate by brand. We regularly pull JM batt material from attics where rodents have nested, and the urine and droppings make that material unsafe to leave. This is not a spot-clean job. We remove the contaminated insulation, sanitize the decking, and rodent-proof before reinstalling.
- Vermiculite insulation that’s sometimes mistaken for JM material. Sometimes a Glendale homeowner calls us thinking they have old JM insulation, and it turns out to be vermiculite. Johns Manville never made residential vermiculite insulation, but older homes around Glendale had it installed under various brand names, and it can contain asbestos. If we see vermiculite, we stop and recommend testing before any removal. We’d rather lose a job than expose a family or our crew to asbestos.
Here’s a quick-glance list for when you’re not sure what you’re dealing with:
- Brown paper facing peeling off batts? That’s old JM ComfortTherm, and it’s done its time.
- Fluffy pink or white loose-fill that’s flat and thin? Could be JM Spider that’s compressed, or a budget job from 20 years ago.
- Pellets that look like mica or cat litter? That’s vermiculite, not JM. Don’t touch it. Call us and we’ll point you to testing.
- Hard, crusty batts near the eaves? Almost always a roof leak or condensation problem. Removing the insulation without fixing the cause just costs you twice.
The Real Difference Between Johns Manville Series in Glendale Homes
Not all JM products fail in the same way, and knowing which one you have changes how we handle removal and replacement. Here’s what we see the most around Glendale.
ComfortTherm batts (kraft-faced, often R-13 or R-19) are the workhorse of 1990s and early 2000s Glendale remodels. They fail at the facing first. Once the vapor retarder tears, the batt itself can still look fine, but it’s not doing the job. We’ve pulled ComfortTherm out of attics that looked brand new until you turned it over and found the facing had turned to brittle flakes.
JM Attic Protector blown-in fiberglass is the loose-fill you see in newer Glendale homes. It’s a good product, but the contractor who installed it matters more than the bag. If it was blown to the wrong density or depth, it drifts and leaves bare spots. We fix that by removing everything, sealing the floor, and blowing to the depth that matches the label’s R-value.
JM Spider is a spray-applied fiberglass system that requires a trained installer. In Glendale, we see Spider jobs where the installer used the wrong adhesive or didn’t fluff the material enough. The result is clumping and sagging within a few years. Spider usually has to come out and be replaced with either a proper batt system or a blown-in product done right.
JM TempControl and EasyFit batts are newer lines designed for precise sizing. EasyFit is cut to fit standard cavities; it’s fine stuff. But if an EasyFit job was forced into non-standard joist spacing, the batts wrinkle and compress at the edges. Air finds those gaps fast.
All of this matters because you can’t just “add more insulation” on top of a failed product. If the old JM material is wet, compacted, contaminated, or torn, more insulation on top just buries the problem.
Our Johns Manville Insulation Removal & Replacement Process
- 1
Upfront inspection. We get in the attic, measure what’s there, and take photos. You see exactly what we see before we bid. No mystery numbers.
- 2
Honest recommendation. If your JM insulation is salvageable, we’ll tell you. Fluffing or topping off is sometimes the right move, especially if the only issue is settling. If it needs to go, we say so and explain why.
- 3
Removal. We use a commercial HEPA-filtered vacuum system to remove old batts or blown-in material. The attic is tested after removal to verify it’s clear.
- 4
Air sealing and prep. Before any new material goes in, we seal ceiling penetrations, top plates, and can lights where code allows. Air leaks through the ceiling are a bigger problem than thin insulation in most Glendale homes.
- 5
Replacement installation. We install fresh insulation at the correct R-value for attic, wall, or floor. We work with Owens Corning, Rockwool, Knauf, CertainTeed, Icynene, Demilec, GreenFiber, and Johns Manville, so you’re not locked into one brand.
- 6
Verification and cleanup. We document the finished depth, check coverage, and leave the house cleaner than we found it. The job is covered by the Done Right Promise, ours, for life.
What Johns Manville Insulation Removal & Replacement Costs in Glendale
Here’s the pricing picture for typical JM jobs we do in Glendale. These are ballpark ranges because every attic is different:
- Attic insulation removal (JM batts or blown-in): $1.25 to $2.75 per square foot, including disposal
- Removal plus R-38 blown-in replacement (standard 1,200 sq ft attic): $2,800 to $4,600
- Rodent contamination cleanup, removal, and replacement: Add $900 to $1,800 depending on severity
- Partial removal of water-damaged JM batts plus replacement: $700 to $1,600 for typical affected areas
What moves the price? Attic access size, the square footage, how much contaminated material has to be bagged, and whether we’re also correcting an air-sealing or ventilation problem. You’ll get a straight quote after the inspection. Estimates are free, and so is a second opinion, because Walt will come out and check any written estimate you have rather than let you overpay or under-insulate. Call (747) 246-7237 to set that up.
Why Glendale Homeowners Call Walt’s Insulation for Johns Manville Work
We’ve been at this since 2000. Walt Brenner, our owner, trained in the trades back at St. Philip’s College before heading west, and our trucks have been parked all over Glendale, near the Americana on Brand more times than we can count. When you call us, a real person answers, day or night, not a phone tree. That’s how we’ve always run it.
We’re independent, which means we don’t push one manufacturer. If a product from Owens Corning, Rockwool, or Reflectix makes more sense for your Glendale house, that’s what we’ll recommend. Our techs work on enough insulation brands that they can spot a bad install from across the attic. And when we’re done, it’s covered by our Done Right Promise: if it’s not done right, we make it right. No fine print, no runaround. That’s the whole point of the one down the road.
FAQs
The JM product warranty typically covers manufacturing defects in the material, not removal, and most JM residential warranties are already expired by the time insulation fails. As an independent service provider, we can’t speak for Johns Manville, but we can tell you we’ve never had a Glendale customer report a warranty claim rejection due to professional removal and replacement. If you have an active warranty, contact JM directly to confirm coverage before removal.
If it’s dry, free of rodent waste, and just settled or thin, a top-off with more blown-in material is usually the answer. If you have water damage, mold, contamination, or failed vapor facing, removal is the right call, because adding insulation over the problem creates a bigger problem. We’ll know after one look in the attic. Call (747) 246-7237 and we’ll tell you straight.
Most standard Glendale attics are done in one to two days. If we’re also air sealing and rodent proofing, plan for another half day. We’ll give you a timeline before the job starts and stick to it.
We can coordinate vermiculite removal with a licensed asbestos abatement company if testing comes back positive, but we don’t remove it ourselves unless the test clears it. Your safety matters more than a job ticket. If your Glendale attic has vermiculite, call us first and we’ll point you to the right testing lab.
Replacement without removal is only cheaper if the old material is clean, dry, and structurally fine, which isn’t common in failed insulation. Burying wet or contaminated material under new insulation locks in the moisture and the odor. Removal first costs a little more up front, but you won’t be paying us again in three years to do what should have been done once.
Do it right the first time or you’ll be doing it twice, and the second time costs more.
If you have Johns Manville insulation in your Glendale home and you’re not sure what it needs, call Walt’s Insulation at (747) 246-7237. The estimate is free, the advice is honest, and the work is guaranteed for life. The one down the road, not an 800 number.
Written by Walt Brenner, Owner, Walt’s Insulation at Walt’s Insulation, serving Glendale and nearby areas.