What is the best garage door bottom seal to keep out mice in rural New Brunswick?

The best garage door bottom seal for keeping mice out in rural NB is a dual-durometer rubber seal with a flexible lip that maintains contact with uneven concrete floors, combined with proper threshold preparation and regular inspection.

Mice are persistent in rural New Brunswick, especially during fall when they seek warm shelter for winter. A standard vinyl or basic rubber door seal often leaves gaps where mice can squeeze through — they only need a gap the size of a dime (about 6mm) to enter your garage.

Dual-durometer rubber seals are the most effective option for NB conditions. These seals have a firm rubber base that attaches to the door and a softer, more flexible lip that conforms to irregularities in your concrete floor. The Clopay Premium Bottom Seal and Wayne Dalton TorqueMaster Bottom Seal are excellent choices available through most NB garage door dealers. Expect to pay $40-$80 for a quality seal for a standard 16-foot double door.

Brush seals combined with rubber provide even better protection in rural areas with heavy rodent pressure. The brush fills small gaps while the rubber creates the primary barrier. However, brush seals collect debris and require more maintenance — plan to clean them monthly during leaf season and after winter storms.

Your concrete threshold condition matters enormously. If your garage floor has settled, cracked, or was poured with poor finishing, even the best seal won't work effectively. Minor floor irregularities can be addressed with self-leveling concrete compound ($30-$50 for materials) applied in a 6-inch strip where the door contacts the floor. For severely uneven floors, consider having a concrete contractor grind the threshold smooth or pour a new approach slab.

Installation details make the difference between success and failure. The seal must be centered on the door bottom with no gaps at the corners where mice typically find entry points. Use stainless steel screws rather than the aluminum screws that often come with seals — they won't corrode in NB's Maritime climate. Apply a bead of exterior-grade silicone caulk at each end of the seal where it meets the door track to eliminate corner gaps.

Maintenance is critical in rural NB where leaves, snow, ice, and debris constantly challenge the seal. Inspect monthly and clear any buildup that prevents the seal from making full contact with the floor. Ice formation under the seal is common during freeze-thaw cycles — gently remove ice rather than forcing the door, which can tear the seal.

Beyond the bottom seal, check your garage door side and top seals. Mice are excellent climbers and will find alternative entry points if the bottom is well-sealed. The side track seals should make firm contact with the door panels, and the top seal should compress fully when the door is closed.

Consider the bigger picture for rural mouse control. Eliminate food sources (pet food, birdseed, grass seed) from the garage, seal any wall penetrations around electrical outlets or pipes, and maintain a clean perimeter around the garage — tall grass and brush provide cover for mice approaching the building.

Professional installation is worth considering if your door is older or if you're not comfortable with the adjustment process. A garage door technician can ensure proper seal contact, adjust door tension if needed, and identify other potential entry points. Installation typically costs $75-$150 including the seal.

When to hire a pro: If your garage door doesn't close evenly against the floor, if the door tracks are damaged or misaligned, or if you discover the concrete threshold needs significant repair, call a professional. Forcing a door to seal against an uneven floor will damage the door mechanism and void warranties.

Find garage door service professionals through the New Brunswick Construction Network who understand rural NB mouse control challenges and can recommend the best sealing solution for your specific door and floor conditions.