Rodent Slab Installation Stops Crawl Space Tunneling, Seattle, WA

Homeowners in Seattle were experiencing persistent rodent activity due to a shallow foundation that left their crawl space vulnerable to tunneling. Rodents had created entry points from outside the home and established nesting areas beneath the house, leading to contamination and insulation damage. After a thorough inspection, our team identified multiple tunnels and access points leading directly into the crawl space. To permanently address the issue, we recommend a rodent slab installation combined with full crawl space restoration and rodent exclusion.

Our crew completed a full cleanout, sealed all entry points, restored insulation and ductwork efficiency, and installed a reinforced concrete rodent slab to prevent future tunneling. The result was a clean, sealed, and protected crawl space designed to keep rodents out and improve overall home performance.

Location: Seattle, WA

Duration: 2 days

Crawl Space Services Performed

• Crawl Space Clean and Sanitize: Removed old insulation, vapor barrier, animal feces, nests, carcasses, and debris. Sanitized with a mold inhibitor.
• Rodent Exclusion: Sealed all entry points using concrete, steel wire, construction adhesive, and re-screened vents.
• Prescriptive Air Seal: Sealed air leaks around plumbing, ducting, and electrical wiring with foam.
• Crawl Space Insulation: Wrapped water supply lines with R11 fiberglass insulation and installed R25 fiberglass batted insulation on the floor.
• Rigid Duct Package: Sealed the ducts at all joints, corners, and saddles with water-based mastic paste to prevent air leakage. Wrapped the air ducts with R11 fiberglass wrap insulation.
• Rodent Slab Installation – Crawl Space Concrete Barrier
  • Preparation: Leveled and prepared the crawl space ground surface as evenly as reasonably possible to allow proper slab installation.
  • Vapor Barrier Installation: Installed 6 mil polyethylene vapor barrier over soil to control ground moisture and protect concrete.
  • Reinforcement: Installed steel rebar over vapor barrier for added strength and long-term durability
  • Concrete Placement: Mixed and poured concrete on site, hand-finished to create a smooth surface where accessible, with an average slab thickness of 2.5 inches.