Johns Manville Attic Cleaning & Rodent Proofing in San Jose: What to Know First
Rodents in a Johns Manville-insulated attic in San Jose usually means two things: the insulation itself has been shredded for nesting, and the air sealing under it has been compromised. We clean it out, sanitize the space, seal every entry point, and restore the attic to a condition that actually insulates again. Most single-story San Jose homes take one full day; two-story homes with vaulted sections can run a day and a half.
This page is for homeowners in San Jose who own a home insulated with Johns Manville products and have heard scratching in the ceiling, found droppings in the attic, or noticed a smell that won’t go away. If that’s you, call (408) 837-7384. A live person answers, even at 2 a.m. when you’re lying awake listening to something chew.
Key Takeaways:
- Rodent activity destroys Johns Manville insulation’s R-value. Cleaning without re-air-sealing is a half job that costs you twice.
- We’re an independent Johns Manville service provider. We do not need a manufacturer authorization to do the work correctly, and we won’t void your warranty by cutting corners.
- Every job ends with the Done Right Promise: if it’s not done right, we make it right. No runaround, no callback charges, ever.
- We’re the one down the road. Founded in 2000, locally owned, with a published address and license number you can actually look up.
How Johns Manville Products Fail - and How We Fix Them
We’ve pulled enough Johns Manville out of San Jose attics to recognize the patterns. Here’s what actually happens when rodents move into JM-insulated attics, and what we do about it.
- ComfortTherm batts get tunneled through the middle. Rodents don’t just sit on top of JM ComfortTherm batts. They burrow through the core, leaving a hollow channel under the kraft facing that looks fine from above but carries zero R-value. We remove every compromised batt, because spot-patching tunneled insulation leaves hidden dead zones. The exposed facing is also a vapor retarder that traps moisture once the batt is disturbed.
- Attic Protector blown-in fiberglass hides activity until the damage is severe. JM Attic Protector is loose-fill, and loose-fill is a rodent paradise. They tunnel under it, nest in it, and the damage stays hidden until you notice a room that won’t hold temperature or a smell that gets worse when the sun hits the roof. During cleanout we vacuum to the deck, not just the top layer. Skipping the bottom inch is how you leave urine-soaked fiberglass against your drywall.
- Foil-faced JM products get chewed away at the edges. We see foil-faced Johns Manville insulation in older San Jose builds, and rodents shred the foil facing for nesting material. Once the facing is gone, the fiberglass core wicks moisture from attic air, and R-value drops fast. We replace damaged sections and verify the replacement matches the original vapor profile.
- Contamination spreads faster in JM fiberglass than in dense-packed alternatives. Loose-fill fiberglass like Attic Protector is air-permeable. When rodents urinate and defecate in it, the odor and particulate travel through the whole attic faster than in dense-packed materials. That’s why we don’t offer spot-treatment for serious contamination. The full cleanout is the only fix that actually works, and we tell you that before we quote anything.
- Air sealing failures invite them back. Johns Manville insulation only works as part of a sealed system. The real entry points in San Jose attics are almost always the same: gaps around plumbing vents, recessed light housings, and the top plates of interior walls. Rodents follow warm air rising through those gaps. If we clean and don’t seal, we’ll be back. So we seal on every rodent job, no exception.
Our Johns Manville Attic Cleaning & Rodent Proofing Process
Here’s how a Johns Manville attic cleaning and rodent proofing job runs with us, from the first call to the last bag of debris.
- 1
Call and schedule. You talk to a person, not a menu. We ask what you’re hearing, seeing, or smelling, and we schedule a visit. There’s no trip charge inside our service county.
- 2
Full attic inspection. We map the insulation type, the extent of contamination, and every potential entry point. We photograph everything so you can see what we see, even if you never set foot in the attic.
- 3
Straightforward quote. We give you a line-item price before any work starts. If you have a written estimate from another company, bring it. We’ll give you a free second opinion.
- 4
Cleanout and sanitizing. We remove contaminated Johns Manville insulation down to the deck, HEPA-vacuum the entire space, and apply a hospital-grade sanitizing agent rated for attic surfaces. We bag everything and haul it off. Nothing sits in your driveway for a week.
- 5
Air sealing and exclusion. We close every entry point we identified, using metal mesh, sealant, and physical barriers where appropriate. This is the step that keeps rodents from coming back.
- 6
Restoration and final check. We install new insulation per San Jose building code recommendations (often Johns Manville again, but we’ll talk through your options). Then we walk the attic one more time and document the finished work. Every job carries the Done Right Promise. If anything isn’t right, we come back and fix it.
What Johns Manville Attic Cleaning & Rodent Proofing Costs in San Jose
Here’s what we typically see for Johns Manville attic cleaning and rodent proofing in San Jose. Every price depends on what we find when we get up there, so call (408) 837-7384 for a real quote. Estimates are free, and there’s no trip charge in our service county.
| Service | Typical Range in San Jose |
|---|---|
| Inspection and contamination assessment | Free with scheduled service |
| Full attic cleanout (JM loose-fill removal, HEPA vacuum) | $1,200 - $2,800 |
| Sanitizing and decontamination | $350 - $700 |
| Rodent proofing and air sealing (per job, not per hole) | $800 - $2,200 |
| Complete restoration (new JM or equivalent insulation) | $2,500 - $6,000+ depending on attic size and R-value target |
What moves the price: attic square footage, how long the infestation was active, whether you need new insulation or just restoration of existing JM material, and how many entry points we find. A 1,200-square-foot ranch in Willow Glen with light contamination costs far less than a 3,000-square-foot two-story in Almaden Valley that’s been hosting a rodent family for six months. We also take $40 off any repair over $200, and seniors and veterans get 10% off, always.
Why San Jose Homeowners Call Walt’s Insulation for Johns Manville Work
We’ve been doing this in San Jose since 2000. That matters because we’ve seen how Johns Manville products perform in this specific climate: dry summers, damp winters, and rodents that never seem to take a season off. Our technicians are background-checked and uniformed, so when we say we’re sending someone to your house, you know exactly who’s walking through the door. Walt Brenner built this company on the idea that homeowners deserve straight answers and work that doesn’t need a callback. We also work with Reflectix and every other major manufacturer, so if Johns Manville isn’t the right product for your restoration, we won’t force it. We’re the one down the road, and we answer the phone like it.
FAQs
In most cases, a professional cleanout and restoration done by an independent contractor does not void the Johns Manville product warranty on newly installed material, as long as the installation follows manufacturer specifications. Rodent contamination itself is typically excluded from warranty coverage regardless. We handle the entire process in a warranty-safe way, and we’ll document everything we install.
Same-week scheduling is typical for most Johns Manville attic cleaning and rodent proofing jobs in San Jose, with same-day or next-day availability during active rodent emergencies. Call (408) 837-7384 and you’ll get a live person who can tell you the next available slot right then.
If contamination is light and the JM material is still performing, targeted removal and sanitizing can save you real money. If the insulation has been tunneled, urine-soaked, or compressed, replacement is usually the better financial call because you’d otherwise pay for cleaning that doesn’t restore R-value. We’ll tell you which one makes sense after we inspect, and we won’t upsell you into a full replacement if you don’t need one.
Rodent proofing itself requires working around the insulation to access top plates and penetrations, but we don’t need to remove healthy JM material to do it. The cleanout and the proofing happen as one job because sealing entry points while there’s still contaminated material in the attic just locks the problem inside. Call (408) 837-7384 and we’ll walk you through what your attic actually needs.
Yes. We install Johns Manville products regularly and can match the R-value you had or bring you up to current San Jose code recommendations. We also work with Owens Corning, Rockwool, Knauf, CertainTeed, Icynene, Demilec, and GreenFiber, so you’ll get the product that fits your budget and your attic, not the one we happen to have on the truck.
Written by Walt Brenner, Owner, Walt’s Insulation at Walt’s Insulation, serving San Jose and nearby areas.