How can I seal drafts to prevent mice? - briefly
Identify and close all gaps with steel wool, caulk, or expanding foam, especially around pipes, vents, and foundation cracks. Install door sweeps and weatherstripping to block remaining drafts that could invite rodents.
How can I seal drafts to prevent mice? - in detail
Identify every opening in the building envelope. Examine the exterior walls, foundation, windows, doors, utility penetrations, and roof for gaps larger than ¼ inch. Use a flashlight and a thin piece of paper to confirm airflow and potential rodent pathways.
Seal gaps with appropriate materials:
- Caulk for small cracks around trim, baseboards, and window frames. Apply silicone‑based or acrylic‑latex caulk and smooth with a putty knife.
- Steel wool packed tightly into holes around pipes, vents, and conduit. Cover with expanding foam to prevent compression.
- Expandable spray foam for irregular openings up to 2 inches. Trim excess after curing.
- Copper mesh or hardware cloth (½‑inch gauge) for larger openings such as crawl‑space vents; staple securely and seal edges with caulk.
- Door sweeps attached to the bottom of exterior doors; ensure the sweep contacts the floor evenly.
- Weatherstripping on all movable frames, including windows, garage doors, and sliding doors. Replace worn strips annually.
- Foundation sealant applied to the exterior footing after cleaning debris; use a polyurethane sealant for long‑term durability.
Reinforce vulnerable areas:
- Install rodent‑proof vent covers on attic and soffit vents; choose screens with a mesh size no larger than ¼ inch.
- Fit pipe collars around all service lines entering the structure; close any gaps with steel wool and foam.
- Apply foam backer rod before caulking deep recesses to provide a backing that prevents shrinkage.
Perform a final inspection after sealing. Close windows and doors, then run a smoke pencil or incense stick near each sealed point; any lingering movement of the smoke indicates remaining leaks. Repeat the sealing process until airflow is eliminated.
Maintain the barrier by:
- Checking seals quarterly for damage from weather or settling.
- Reapplying caulk to deteriorated joints.
- Replacing door sweeps and weatherstripping as they wear.
A comprehensive sealing regimen eliminates drafts and removes the pathways mice use to enter, providing a durable, rodent‑free environment.