Rodent Contamination Cleanup in a 978 Square Foot Bedford Crawl Space
1 / 6Rodent nest debris and contaminated insulation along the rim joist of the Bedford, NY crawl space before cleanup
See How the Work Was Done
Real photos from this Bedford project: the rodent contamination, the sealed containment corridor, and the cleaned, treated crawl space.
What Happened
The crawl space under this Bedford, NY home had been hosting rodents long enough for the damage to reach every surface: droppings across the 978 square foot slab and framing, nesting material packed into the duct insulation, contaminated batts sagging between the joists, and a vapor barrier that had failed. The crew suited up in Tyvek with N95 respirators, then built the job around containment before touching anything dirty. A sealed poly corridor with taped floor protection ran from the access door through the finished basement, with a decontamination chamber so technicians and bagged debris never tracked contamination into the home. Under three days of HEPA negative air, 475 square feet of contaminated insulation and 500 linear feet of lower drywall came out in sealed bags. The full footprint was then HEPA vacuumed in detail to remove the droppings, the concrete was damp wiped with a plant-based antimicrobial, and the same agent went on as a ULV cold fog to reach the framing cavities a wipe cannot. Every bag left through the containment corridor, and the space was left clean, treated, and ready for new insulation.
Scope of Damage
Insulation & Nests
SevereRodent nests in the duct insulation and contaminated batts between the joists. 475 square feet of insulation was removed and bagged in the confined space.
Framing & Slab
SevereDroppings across the 978 square foot footprint. The full slab and framing were HEPA vacuumed in detail before any treatment went on.
Lower Drywall
ModerateContaminated drywall skirting around the crawl space perimeter. 500 linear feet was cut out, bagged, and disposed of.
How We Solved It
- 1
Containment & Decon Chamber
A sealed poly corridor with taped floor protection ran through the finished basement to the access point, with a decontamination chamber so crew and debris never crossed into the clean home.
- 2
HEPA Negative Air
A HEPA air scrubber ran as negative air for three days, keeping the work zone under negative pressure for the entire removal and cleaning.
- 3
Removals
475 square feet of contaminated insulation and 500 linear feet of lower drywall cut out and bagged inside the confined space, in full PPE.
- 4
Detailed HEPA Vacuuming
The full 978 square foot slab and the framing were HEPA vacuumed in detail to physically remove droppings and fine debris.
- 5
Antimicrobial Treatment
A plant-based antimicrobial applied twice: damp wiped onto the concrete, then ULV cold fogged to reach cavities and framing a wipe cannot touch.
Tools & Equipment Used
Questions Homeowners Ask
Why is rodent cleanup treated as a health job and not just a cleaning?
Rodent droppings and nesting material can carry pathogens, including hantavirus, that become airborne when dry material is disturbed. That is why this Bedford crawl space was worked in Tyvek suits and N95 respirators under HEPA negative air, with droppings removed by HEPA vacuum rather than swept or blown out. Sweeping dry droppings is the one thing a homeowner should never do.
Why build containment through the house for a crawl space job?
Every bag of contaminated insulation and drywall had to travel from the crawl space access through the finished basement. A sealed poly corridor with floor protection and a decontamination chamber means the debris, and the technicians carrying it, never touch clean surfaces. Without it, the cleanup can spread the contamination it is supposed to remove.
Does the insulation always have to come out?
Insulation that rodents have nested in or soiled cannot be cleaned, because droppings and urine soak into the material itself. In this Bedford crawl space, 475 square feet of contaminated insulation was removed and bagged. Framing and concrete, by contrast, are hard surfaces that can be HEPA vacuumed and treated, which is why they stay.
What does the antimicrobial treatment actually do?
After the physical removal of droppings by HEPA vacuum, a plant-based antimicrobial was applied two ways: damp wiped onto the 978 square feet of concrete for direct contact, then applied as an ULV cold fog that reaches framing cavities and gaps a wipe cannot. The fog step matters because rodents travel through exactly the spaces hands cannot reach.
How long does a full crawl space rodent cleanup take?
This 978 square foot cleanup ran three days, matching the three days of HEPA negative air that stayed on from the first removal to the final treatment. Smaller spaces with lighter contamination can run shorter. The honest driver is the amount of contaminated material that has to be bagged out through a confined space, not the square footage alone.
How do I keep rodents from coming back after a cleanup?
A cleanup removes the contamination, but exclusion keeps it from returning: sealing entry gaps, keeping vegetation off the foundation, and replacing the removed insulation so the space no longer offers warm nesting material with easy access. We document entry evidence we find during the work so your pest control or handyman can close the specific routes.
