Crews in the Bay Area argue this on almost every rodent job. Some prefer batts because a future inspection can lift a bay. Others prefer blown-in because it settles into odd joist spacing and around ducts. Both can be correct.
Blown-in and cellulose
Loose fill covers corners that batts miss. It is often the better blanket on an irregular attic floor after a full vacuum-out. Cellulose is a dense recycled option. Either one should go in only after exclusion and sanitation, or rodents will tunnel it again.
Batts and rolled product
Fiberglass batts fit standard 16 or 24 inch framing when the floor is empty and clean. They are easier to pull back if you need to see wiring or a leak. Poor cuts leave gaps, so install quality matters more than the brand name on the bag.
Spray foam and add-ons
Spray foam and targeted add-ons help at edges, kneewalls, and spots where air leaks more than R-value. We use them where the inspection shows a gap, not as a default for every South Bay ranch.
See insulation services and how we handle removal in Campbell and San Jose. The inspection is free: (408) 963-6024.
Questions homeowners ask
Is blown-in better than batts after rats?
Blown-in fills irregular bays and around wires well. Batts are easier to lift later if you expect more inspections. We recommend from the actual attic, not a single default.
Do you install spray foam or cellulose too?
Yes. Spray foam, cellulose, batts, rolled, blown-in, and add-on layers are all options after cleanup, matched to the structure and the written plan.
Need an inspection in Campbell or San Jose?
Call (408) 963-6024 or send the contact form. The visit is free. License #1148243.
Request a free inspection