How can I seal gaps in baseboards from mice? - briefly
Inspect the baseboard seams, pack any openings with steel wool, then seal them with acrylic caulk or low‑expansion spray foam, and finish by reinstalling or painting over the trim.
How can I seal gaps in baseboards from mice? - in detail
Mice enter homes through tiny openings around the lower wall trim. Closing those openings eliminates a primary access point and reduces the likelihood of infestation.
First, locate every gap. Inspect the perimeter of each baseboard, paying special attention to corners, joints, and areas where the trim meets the floor. Use a flashlight and a thin piece of paper; if it can be pulled through, the opening needs sealing.
Next, prepare the surface. Remove dust, debris, and loose paint with a vacuum or a damp cloth. Ensure the wood is dry; moisture can prevent adhesives from adhering properly.
Choose appropriate filler materials:
- Steel wool – compresses into irregular gaps, providing a barrier that rodents cannot chew through.
- Expanding polyurethane foam – fills larger voids; trim excess after curing.
- Silicone or acrylic caulk – seals narrow cracks and joints; remains flexible for wood movement.
- Flashing tape or metal mesh – reinforces areas where steel wool alone may be insufficient.
Apply the sealants in the following order for maximum effectiveness:
- Pack steel wool tightly into the opening, leaving a small cavity for the caulk.
- Inject foam into any remaining voids larger than ¼ inch, allowing it to expand and fill the space.
- Smooth a bead of caulk over the filled area, pressing it into the edges of the baseboard and floor.
- Allow the caulk to cure according to the manufacturer’s instructions, typically 24 hours.
- Paint or touch‑up the sealed sections to match the surrounding trim, protecting the filler from moisture and wear.
After sealing, monitor the area for signs of new activity. If droppings or gnaw marks appear, re‑inspect for missed gaps or damage to the applied barrier. Regular cleaning of the baseboard line and prompt repair of any cracks caused by settling will maintain the integrity of the seal.