Raccoons do not scatter waste through an attic. They choose one or two spots and use them repeatedly, which produces a concentrated accumulation known as a latrine. That concentration is exactly what makes it a health issue rather than a mess.
Where latrines form
Flat areas near the edge of the attic, on top of ductwork, at the base of a chimney chase, in the fork of a tree outside, or on a flat section of roof or deck.
They are easy to miss because they are rarely near the hatch. An inspection that does not cover the whole attic floor will not find one.
Why the cleanup matters
Raccoon waste can contain roundworm eggs that remain viable for a long time and become airborne on dust when disturbed. Sweeping a latrine is the wrong move.
The risk is highest for small children and anyone who spends time in or below the space during a disturbance, such as a renovation or an insulation replacement.
Proper cleanup means containment, protective equipment, removal of contaminated material rather than surface cleaning, and disposal rather than bagging into a household bin.
What proper remediation involves
Physical removal of the latrine material and surrounding contaminated insulation. Treating the surface without removing the material underneath achieves very little.
Sanitising and antimicrobial treatment of the exposed deck and framing. Odour and pheromone neutralising, which matters because residual scent attracts the next raccoon.
New insulation installed to the correct depth afterwards, which also restores the thermal performance you had been losing.
The energy side of it
Insulation that has been compressed into runways, pulled into nests and saturated is not delivering its rated value. People regularly notice a difference in heating and cooling costs after a restoration, which offsets part of the work.
Documenting it
Photograph before, during and after. Attic restoration is one of the more commonly covered items on a homeowner policy, and a documented scope is what gets a claim paid.