Why Rodents Move into Attics

Hillsboro attics stay warm in winter and provide safe nesting sites away from predators. Rodents enter through gaps as small as a quarter inch, often near roof vents, eave returns, and where utility lines penetrate the roofline. Once inside, they shred insulation to build nests, chew on wiring, and leave droppings throughout the space. Their urine soaks into insulation and wood framing, creating a strong ammonia smell that worsens over time. Some homeowners only discover the problem when they notice odors, hear scratching noises, or find rodent droppings in living spaces.

Health Risks of Rodent Contamination

Rodent droppings and urine carry bacteria, viruses, and parasites that cause disease. Hantavirus, leptospirosis, and salmonella are all transmitted through contact with contaminated materials or inhalation of dust particles. When HVAC systems pull air from an infested attic, those particles spread into living areas. Children, elderly individuals, and anyone with respiratory conditions are especially vulnerable. Cleaning rodent waste without proper PPE and containment can expose you to these pathogens.

Professional Attic Rodent Cleanup

We start by confirming that all rodents are removed and entry points are sealed by a pest control professional. Then we remove contaminated insulation, bag it in heavy-duty plastic, and dispose of it according to Oregon regulations. We HEPA-vacuum exposed framing to remove droppings and dust, then treat surfaces with EPA-registered disinfectants rated for rodent waste. If odor persists, we apply enzyme treatments or seal wood surfaces with odor-blocking primers. Once the attic is clean and dry, we install new insulation rated for Oregon's climate. We do not reinstall insulation until the space is verified rodent-free.

Insurance and Rodent Damage

Most homeowners policies exclude rodent damage because it's considered preventable through maintenance. However, if rodents caused a sudden plumbing failure or chewed through wiring and started a fire, there may be coverage for resulting damage. We document all findings, photograph contaminated areas, and provide a detailed scope. If any part of the loss is covered, we'll handle that portion of the claim.

If rodents have been in your attic, call for a free inspection. We'll assess the contamination, remove damaged insulation, and restore your attic to safe, clean condition.