Johns Manville Attic Cleaning & Rodent Proofing in Chicago: What to Know First
Johns Manville attic cleaning and rodent proofing in Chicago typically runs between $1,800 and $4,200 depending on attic square footage, contamination level, and whether the existing Johns Manville insulation is salvageable or needs removal. Most jobs are completed in one to two days, including sanitizing, air sealing, and exclusion work. We operate as an independent Johns Manville service provider, which means we service the product without being beholden to any manufacturer’s warranty department or corporate service schedule. If you own a Johns Manville attic system and you’ve heard scratching, found droppings, or noticed insulation that looks compressed and matted down, call us at (218) 261-7714. We’ll give you a written price before anyone lifts a tool.
How Johns Manville Products Fail - and How We Fix Them
- Johns Manville ComfortTherm batts in rim joist and knee wall cavities. ComfortTherm batts are wrapped in a poly-encapsulated facing that rodents find easy to shred for nesting material. Once the facing is torn, the fiberglass loses its air-sealing contribution and the cavity becomes a highway for conditioned air to escape into the attic. We remove the damaged batts, air-seal the cavity with foam, and install fresh insulation only after the exclusion work is complete.
- Johns Manville Attic Protector blown-in fiberglass settling in Chicago’s freeze-thaw cycles. Chicago winters cause repeated condensation at the attic floor level when top plates and can lights aren’t sealed. That moisture weighs down the Attic Protector loose-fill, compressing it and cutting its R-value per inch from about R-2.9 down to R-1.9 or lower in the worst spots. Our blower-door test, a pressurization reading that shows in one number how much air the envelope is losing, tells us where the air leaks are before we remove or top up anything.
- Rodent tunnels through Johns Manville MR (Moisture Resistant) faced insulation in cathedral ceilings. When we see MR faced batts in a vaulted ceiling that’s been compromised, the problem is almost always a roof deck penetration or soffit gap that was never sealed. Rodents follow the warm air escaping through those gaps, and they chew through the facing to get at the fiberglass. We fix the penetration first, then replace the damaged section. The insulation was never the root cause; the hole was.
- Johns Manville Spider custom blow-in fiberglass in wall cavities that meet the attic floor. Spider insulation is blown behind netting, and where the netting meets the top plate of an exterior wall, there’s often a gap. Rodents navigate up through balloon-frame wall cavities in older Chicago homes and enter the attic at exactly that seam. We find these entry points during the inspection, seal them with rodent-proof materials, and verify the fix with a post-work pressure test.
- Contaminated Johns Manville loose-fill that tests positive for rodent activity. Once droppings and urine saturate blown-in fiberglass, cleaning is not a viable option. The material has to come out. We use commercial HEPA-filtered vacuums to remove contaminated Johns Manville insulation, sanitize the attic deck and framing, then re-insulate with fresh material. The photos we take before, during, and after are part of the Documented Photo Record you receive when we leave.
Our Johns Manville Attic Cleaning & Rodent Proofing Process
- 1
Walkthrough and blower-door baseline. We run a blower-door test before any work starts to document how much air your attic assembly is currently losing. The number goes in your report, not just in our heads.
- 2
Contamination assessment. We map where rodents have been active, what insulation is salvageable, and what needs removal. For Johns Manville blown products, we check for compression, moisture staining, and nesting sites.
- 3
Removal and sanitizing. Contaminated insulation comes out with HEPA-filtered vacuum equipment. We sanitize the attic deck, trusses, and sheathing with a hospital-grade disinfectant that breaks down rodent pheromones, which is what keeps new rodents from following the old scent trails.
- 4
Air sealing and exclusion. Every top plate, can light, plumbing vent, and wire penetration gets sealed. Rodent entry points are closed with steel mesh, flashing, and foam rated for pest exclusion. This is the step most Chicago homes leak air through, and it’s why we seal before we insulate, every time.
- 5
Insulation replacement or top-up. Fresh Johns Manville insulation goes in only after the sealing is verified. Whether you need full replacement or a top-up depends on what the removed material looked like and what the blower-door reading told us.
- 6
Post-work blower-door test and documentation. We run the blower-door again and hand you the numbers: before, after, and the difference. You get a written scope, a photo log, and a warranty that says exactly what we did and how it’s covered under our 365-Day Done Right Promise.
What Johns Manville Attic Cleaning & Rodent Proofing Costs in Chicago
Here are the dollar ranges we quote most often for Johns Manville attics in Chicago:
- Inspection and blower-door diagnostic only: included free with any written estimate. We don’t charge for the number.
- Attic cleaning and sanitizing, no insulation removal (1,200-1,800 sq ft attic): $900-$1,500
- Contaminated Johns Manville insulation removal and disposal (same attic size): $1,400-$2,200
- Rodent proofing and exclusion work: $600-$1,800 depending on entry point count and roof configuration
- Re-insulation after removal (R-49 Johns Manville blown-in fiberglass): $2,800-$4,500
What moves the price: attic accessibility (Chicago bungalows with steep pitches are faster than low-slope ranch homes with tight hatch access), contamination severity, and whether the existing Johns Manville material is reusable. We give you a flat written price before any work starts, under Haven Standard Clause 1, so the number you’re quoted is the number you pay. Call (218) 261-7714 for a free estimate and we’ll give you real numbers for your attic, not a range pulled from a national average.
Why Chicago Homeowners Call Topside Attic Insulation for Johns Manville Work
We’ve sealed and insulated more than 9,000 homes since 2016, every one with a written price before work started and a documented record when the crew left. On Johns Manville jobs, we don’t treat the insulation brand as the whole story. The brand matters less than the holes in the attic floor. Our techs know where Johns Manville products fail in Chicago specifically, which line you have, and whether it’s worth saving. If it isn’t a Johns Manville spec that fits your home’s needs, we’ll tell you, and we work with other materials including Reflectix radiant barrier where the application calls for it. No proprietary product lock-in. One warranty, in writing, covering the whole job for 365 days.
Seal the holes first. Then add the R-value. The numbers will tell you whether it worked.
FAQs
Yes, in nearly every case. Johns Manville’s limited warranties cover manufacturing defects, not post-installation damage from rodents, moisture, or compression. What we do is document the damage with photos and blower-door numbers so you have a record if you need to file an insurance claim. Call (218) 261-7714 and we’ll walk you through what your specific Johns Manville line is rated for and what’s actually covered.
No, not effectively. Once rodent droppings and urine have soaked into fiberglass, the material cannot be sanitized in place. The only safe fix is removal with HEPA-filtered equipment, sanitizing the deck, and installing fresh insulation. We’ll tell you if your material is salvageable during the inspection, but if we see contamination, removal is the answer.
We answer calls 24/7 with a live person. Most Chicago attics can be inspected within one to three days, and emergency rodent exclusion can often be scheduled same-week. The full cleaning and re-insulation job typically runs one to two days on site. Call (218) 261-7714 and you’ll get a real person, not a voicemail loop.
That depends entirely on how much of the attic is contaminated. If rodents chewed one section of ComfortTherm batts, we repair that section and move on. If the entire attic floor is tunneled with droppings throughout the loose-fill, replacement is cheaper than trying to clean material that can’t be cleaned. We’ll show you the numbers on both paths before you decide. No pressure either way, just the math in writing.
Yes. We work with Owens Corning, Knauf, Rockwool, CertainTeed, Icynene, Demilec, GreenFiber, and Reflectix. For Johns Manville owners specifically, that matters because we’re not tied to one manufacturer’s product line. If your attic needs a material that performs better in your specific house, we’ll recommend it, and we’ll put that recommendation in writing with the price attached.
If you’re hearing rodents in your Johns Manville attic in Chicago, call (218) 261-7714. We’ll schedule an inspection, run the blower-door test, and give you a written estimate before any work begins. The estimate is free and the documentation is yours to keep either way.
Written by Wes Okafor, Owner & Lead Building Envelope Technician, Topside Attic Insulation, serving Chicago and nearby areas.