Attic Insulation Remediation - After the Wildlife Is Gone

We need to be clear up front about what this is. This page is not about adding R-value to a cold attic to save on heating bills. That’s a different trade. What we do is remediation - removing insulation that has been contaminated by wildlife use, decontaminating the deck and framing, and then re-insulating so the attic is back to where it should be. The trigger is always a wildlife exposure. The work is always tied to it.

Three kinds of contamination drive most of these jobs in central Indiana. First, raccoon latrines - raccoons defecate in repeated, communal sites, and those sites are the primary risk source for Baylisascaris procyonis, a roundworm whose eggs can remain infective in dried scat for years and which causes serious human disease if ingested. Second, accumulated bat guano - droppings from a long-tenured colony can grow Histoplasma capsulatum, a fungus whose spores cause histoplasmosis when disturbed. Third, heavy rodent contamination - chronic urine and droppings load, plus hantavirus risk from certain rodent species in certain conditions. Dead-animal saturation, where decomposition fluid has soaked into insulation, is the fourth common driver.

The crew, the gear, the sequence

Every crew member working a remediation job is in full PPE - P100 respirators, Tyvek coveralls, sealed gloves, and eye protection. That is not optional and it is not for show. Disturbed bat guano in an enclosed attic produces aerosolized spores. Raccoon latrine eggs become airborne when dried scat is moved. We treat every remediation site as a contaminated environment from the moment the access hatch comes open.

We use a HEPA-filtered insulation vacuum - an industrial unit, vacuum hose run from the truck up through a window or hatch into the attic - and remove insulation in controlled passes into sealed bags. Loose-fill cellulose and fiberglass come out first; batt insulation is rolled, bagged, and removed by hand. Contaminated material is double-bagged at the attic, sealed, and removed from the property the same day.

Once the insulation is out and the deck is exposed, we vacuum the framing and decking, then apply an enzymatic decontamination product across the affected area. Enzymatic treatment breaks down organic residues and odor-producing compounds at the source. We don’t use perfumed maskers. The deck is left to dry, inspected, and any structural repair (chewed wiring, damaged decking, saturated rafters) is identified at this stage and either handled by us or referred to the homeowner’s roofer or general contractor before we re-insulate.

Getting the attic back to code

Re-insulation in central Indiana targets R-49 in most attics under current Indiana Residential Code. That is typically achieved with blown cellulose or blown fiberglass to the appropriate depth, with attic baffles installed at the eaves to maintain soffit ventilation. On older homes with limited rafter depth or low-slope sections where R-49 isn’t physically achievable, the code minimum drops to R-38, and we will note that on the quote and explain why.

Blown cellulose is what we use most often - good thermal performance, settles predictably, treated for fire and pest resistance. Blown fiberglass is the alternative for homes with specific moisture profiles or where the homeowner has a preference. We do not do spray foam as part of standard remediation re-insulation; if a homeowner wants foam, we refer them to a foam specialist after the decontamination work is complete.

Most homeowner policies cover this work

When the contamination is tied to a covered wildlife event - a documented raccoon intrusion, a bat colony established through a roof line breach, rodent damage following a covered storm - most central Indiana homeowner policies cover decontamination and re-insulation as part of the claim. We work directly with the customer’s insurance carrier and adjuster. We document the contamination with photos, scope the work in writing, and provide line-item invoicing that adjusters expect to see.

We do not handle the claim for the homeowner - that’s your relationship with your carrier - but we make sure the documentation is what they need. On larger losses, we coordinate with the homeowner’s roofer or general contractor so structural repair, decontamination, and re-insulation happen in the right order without any one trade redoing another’s work.