When should I replace the weatherstripping around my garage door in Miramichi NB?

Replace your garage door weatherstripping as soon as you notice visible daylight, drafts, water intrusion, or pest entry around the door perimeter — and in Miramichi's cold Maritime climate, the best time to do it is in early fall before winter sets in. Weatherstripping is one of the most affordable and impactful maintenance items on any NB garage, and letting it deteriorate through a Miramichi winter means higher heating costs, snow and rain infiltration, and an open invitation for mice seeking shelter from the cold.

There are three distinct weatherstripping zones on a garage door, and each wears differently. The bottom seal (also called the astragal or U-shaped retainer seal) takes the most abuse — it contacts the garage floor every time the door closes and is ground down by grit, road salt, ice, and UV exposure. In Miramichi, where winter temperatures regularly drop to -20 to -25 degrees Celsius, rubber and vinyl bottom seals become stiff and brittle, losing their ability to conform to the floor surface. A bottom seal that was flexible and effective when installed in summer may be rock-hard and gapped by February. Expect to replace a garage door bottom seal every 3-5 years in NB's climate, or sooner if you notice the door no longer sealing flush against the floor.

The side and top weatherstripping (jamb seals and header seal) are typically PVC or vinyl strips with a flexible fin or bulb that compress against the door panels when closed. These last somewhat longer — 5-8 years in most cases — because they are not subject to the same abrasion as the bottom seal. However, Miramichi's UV exposure and temperature cycling cause them to crack, shrink, and lose elasticity over time. Check these seals by closing the garage door on a sunny day, turning off the garage lights, and looking for daylight around the perimeter. Any visible light means air, water, and pests can enter.

The threshold seal is a separate piece that mounts to the garage floor beneath the door and works in conjunction with the bottom seal. Not all garages have one, but adding a threshold seal is an excellent upgrade for Miramichi garages — it bridges the gap caused by uneven or cracked concrete at the door opening and prevents water from flowing under the door during rain and snowmelt. Threshold seals cost $30-$80 for materials and are a straightforward DIY installation using construction adhesive.

Replacing garage door weatherstripping is one of the best DIY projects for NB homeowners. Bottom seals slide into a retainer channel on the bottom panel — you simply pull the old seal out and slide the new one in, trimming to length with a utility knife. Side and top seals are typically nailed or screwed to the door frame with galvanized fasteners. The entire job takes 1-3 hours and materials cost $40-$120 for a complete set (bottom, sides, and top) from any NB building supply store. For a Miramichi garage, choose rubber or silicone-based seals rather than vinyl — they remain flexible at much lower temperatures and last longer in freeze-thaw conditions.

Timing matters. Early September to mid-October is the ideal replacement window in Miramichi — temperatures are still warm enough for adhesives to cure and for flexible seals to be installed in their natural expanded state. If you install weatherstripping in the dead of winter when it is contracted from the cold, it may fit too loosely in summer when it expands.

One often-overlooked detail: while you are replacing weatherstripping, inspect the garage door panels themselves for warping, denting, or rust that prevents a proper seal. No weatherstripping can compensate for a door panel that has bowed outward from impact or corrosion. Also check that the door tracks are properly aligned and the door sits squarely in the opening — a misaligned door creates gaps that weatherstripping alone cannot fill. If the door itself is damaged or misaligned, a professional garage door technician can assess whether adjustment or panel replacement is needed. Find garage door professionals through the New Brunswick Construction Network at newbrunswickconstructionnetwork.com.