Johns Manville Insulation Removal & Replacement in Sunnyvale: What to Know First
Johns Manville insulation removal and replacement in Sunnyvale typically runs between $1,800 and $4,500 depending on attic size, material type, and how much old insulation needs to come out. Most jobs are completed in one to two days, and we handle the full removal, disposal, and replacement process with new Johns Manville or comparable material. If you’ve got water-damaged, rodent-soiled, or decades-old JM insulation in your attic, call (669) 215-4805 for a straight answer on what it’ll take to fix it.
This page is for Sunnyvale homeowners who own a home with Johns Manville insulation installed and now need it removed and replaced. Whether you’re dealing with a roof leak that soaked the batts, a rodent infestation that turned your attic into a nesting ground, or simply insulation that’s been up there since the Reagan administration, we’ll walk you through what’s involved and what it costs.
Key Takeaways:
- We’re an independent Johns Manville service provider, not a factory-authorized shop, which means we recommend what’s right for your house, not what a corporate program tells us to push
- Free estimates, no trip charge inside Santa Clara County, and a lifetime Done Right Promise on every job
- Most Johns Manville removal and replacement jobs in Sunnyvale are done in one or two days
How Johns Manville Products Fail - and How We Fix Them
Johns Manville makes decent insulation. But like every brand, certain lines have predictable weak spots, especially in Sunnyvale’s climate and housing stock. Here’s what we see in attics across town:
- JM R-19 and R-30 kraft-faced batts losing their facing. The kraft paper facing on older JM ComfortTherm and MR (moisture-resistant) batts breaks down after 20-plus years in a hot attic. The paper dries out, tears away from the fiberglass, and drops into the insulation. Once that facing is gone, the batt loses its vapor-retarder function. We remove the entire layer and replace it with new JM ComfortTherm or unfaced batts plus a separate vapor barrier where the house needs one.
- JM Attic Protector blown-in fiberglass settling below the top of the ceiling joists. This is the most common failure we see in Sunnyvale ranch homes. JM Attic Protector is a good blown-in product, but it settles, especially in attics that get hammered by summer heat. R-38 installed in 2005 might be performing at R-26 by now. We vacuum out the old material, air-seal the attic floor, and blow in fresh JM Attic Protector or GreenFiber cellulose to the correct depth for Sunnyvale’s climate zone.
- Water damage in JM batt insulation around recessed lights and roof penetrations. Sunnyvale’s rainy winters expose any roof flashing weakness fast. Once water hits JM batt insulation, the fiberglass mats down and loses R-value permanently. We remove every wet batt, treat any mold on the framing, fix the air seal around the fixture or penetration, and install new insulation with proper clearance for the light can.
- Rodents nesting in JM ComfortTherm batts. Rats and mice love fiberglass. It’s warm, it’s dry, and it holds their scent. We regularly pull out JM batts in Sunnyvale attics that have been shredded into nesting material. The fix is full removal, sanitizing, sealing every entry point, and then replacing with new insulation plus exclusion work so they don’t come back.
- JM Spider blown-in fiberglass installed over old recessed lighting without proper dams. JM Spider is a loose-fill product that works well when installed correctly. But in older Sunnyvale homes, we find it packed against non-IC-rated light fixtures, which is a fire hazard. We remove the affected material, install proper baffles and dams around the fixtures, and re-insulate with product that meets current code clearance.
Our Johns Manville Insulation Removal & Replacement Process
Here’s how a typical Johns Manville job goes from your first call to the final walkthrough:
- 1
You call and talk to a real person. Not a voicemail, not an answering service. We ask about your house, the age of your insulation, and what prompted the call. Then we schedule a visit, no trip charge inside Santa Clara County.
- 2
Walt or one of our senior techs walks the attic. We measure depth, check for moisture, note any rodent activity, and identify which JM product is up there. We also look at the attic floor for air leaks that should be sealed before new insulation goes in.
- 3
We give you a written estimate with real numbers. You’ll see exactly what’s being removed, how it’s being disposed of, and what’s going back in. If another company has quoted you and you want a second opinion, we’ll provide one free.
- 4
Removal day. We use commercial HEPA-filtered vacuums to pull out the old JM material without dust clouding your ceiling or HVAC. All material is bagged on site and hauled away. If we find vermiculite, we stop and bring in a certified asbestos contractor, because we won’t touch anything we can’t verify is safe.
- 5
Air sealing and prep. Before new insulation goes in, we seal the attic floor penetrations: top plates, wire chases, can lights, plumbing vents. In a Sunnyvale house, this step alone can cut your heating and cooling bills noticeably.
- 6
New insulation installed to spec, then we show you the finished work. Everything is covered by the Done Right Promise. If it’s not done right, we make it right. That’s the whole deal.
What Johns Manville Insulation Removal & Replacement Costs in Sunnyvale
Here’s what Sunnyvale homeowners can expect to pay for common Johns Manville removal and replacement scenarios:
- Small attic, single layer of JM batts, no contamination: $1,800 to $2,800
- Medium attic, JM blown-in removal plus air sealing and new blown-in: $2,800 to $4,200
- Large attic with rodent contamination, full removal, sanitizing, and replacement: $3,800 to $5,500
- JM Spider or batts with water damage requiring mold remediation on framing: $3,200 to $4,800 depending on extent
What moves the price: attic accessibility, how much material has to come out, whether there’s contamination, and what you’re putting back in. A flat, walkable attic with an access ladder inside the house costs less than a low-slope roof you can barely crouch in. Call (669) 215-4805 for an exact quote. Estimates are free, and if you’ve got a written estimate from someone else, bring it over and we’ll give you a second opinion at no charge.
Why Sunnyvale Homeowners Call Walt’s Insulation for Johns Manville Work
We’ve been the one down the road since 2000. Not a franchise, not a call center. Walt Brenner started this business with a truck, a vacuum, and a stubborn belief that homeowners deserve straight answers. That’s still how we operate.
Every Johns Manville job comes with the Done Right Promise: if it’s not done right, we make it right. No runaround, no fine print. Our background-checked, uniformed technicians show up when they say they will. A live person answers every call, 24/7. And while Johns Manville is a product we know deeply, we’re not married to any one brand. If a Reflectix radiant barrier or Rockwool batt makes more sense for your Sunnyvale attic, we’ll tell you that. We’re an independent Johns Manville service provider, so our only loyalty is to the house we’re working on.
Good insulation should be invisible, you only notice it when it’s missing.
FAQs
If your JM insulation is under a current manufacturer warranty, removing it will void that warranty on the removed material. But here’s the thing: if you’re removing insulation, it’s because it failed, got contaminated, or stopped performing. A warranty on dead insulation doesn’t do much for you. We document everything before removal so you have records if you ever need to file a claim. Call (669) 215-4805 and we’ll talk through your specific situation.
It depends on what’s in your attic and how your house is built. In some Sunnyvale homes, new JM Attic Protector or ComfortTherm is the right call. In others, GreenFiber cellulose or Rockwool performs better for the specific conditions. We carry multiple brands, including Johns Manville, so we’re not twisting your arm toward one option. We’ll show you the cost difference and let you decide.
Most Sunnyvale jobs are completed in one to two days. Removal is usually the first day, with air sealing and new installation finishing on day two. If you’ve got an urgent situation like active water damage or rodent activity, call us and we’ll prioritize your job. We answer the phone live, 24/7.
No, but we find it mixed with old JM batts in Sunnyvale homes from the 1950s and 60s. Vermiculite from that era often came from the Libby, Montana mine and can contain asbestos. If we find vermiculite during a removal job, we stop work and bring in a licensed asbestos abatement contractor. We never remove vermiculite ourselves, and we won’t blow new insulation over it without testing.
Yes. That’s exactly what our estimate visit is for. We’ll identify the product, measure the depth, check for moisture and rodent issues, and give you a written estimate. No charge for the visit inside Santa Clara County, no pressure to sign. Call (669) 215-4805 and we’ll get you on the schedule.
Ready to Get That Old Johns Manville Insulation Out?
Call Walt’s Insulation at (669) 215-4805 for a free estimate on Johns Manville insulation removal and replacement in Sunnyvale. We’ll show up on time, tell you what needs to happen, and put the price in writing. Seniors and veterans save 10%, always. And if you’ve got a written estimate from another contractor, bring it over and we’ll give you a free second opinion. No trip charge inside Santa Clara County.
Written by Walt Brenner, Owner, Walt’s Insulation at Walt’s Insulation, serving Sunnyvale and nearby areas.