As temperatures drop in the autumn, we all look for ways to warm up our homes. Unfortunately, we aren’t the only ones: mice and rats are seeking the exact same thing.
With the first frosts, rodents leave fields, parks, and gardens in search of warm shelter, water, and food—making your home a prime target. The most effective way to avoid an unwelcome cohabitation this winter? Preventive mouse-proofing (sealing up potential entry points).
The Weather Effect: Why Rodents Move Indoors in Autumn and Winter
During the spring and summer, mice can easily find food outdoors. However, as the climate in Quebec cools, it triggers an instinctive exploratory behavior in rodents:
The search for warmth
The search for food
The nesting urge
Did you know?
A mouse only needs a gap of 6 millimeters (the thickness of a pencil tip or a 10-cent coin) to squeeze into your walls.
Why is caulking superior to traps and chemical treatments?
Waiting until you see a mouse in your kitchen to act is to intervene too late. Exterior caulking offers a fundamental approach: prevention at the source.
A permanent physical barrier
An eco-friendly and safe solution
Economical in the long term
Infrastructure protection
Which priority access points should be sealed before winter?
During a preventive inspection, technicians from Rive-Nord Extermination pay close attention to the following critical areas:
- Weep holes (ventilation gaps in brickwork): Necessary for the masonry to “breathe,” these must be secured using stainless copper mesh—without being intentionally blocked.
- The foundation-to-cladding junction: The gap between the concrete and the exterior siding (vinyl, aluminum, CanExel) is one of the most common entry points.
- The brick-to-soffit junction: Mice are highly adept at climbing masonry to reach the roof and infiltrate the attic.
- Duct and wiring penetrations: Areas around heat pumps, air exchanger intakes, or electrical cables.
Don’t make the mistake of using standard expanding foam!
Many homeowners try to plug holes themselves using aerosol cans of polyurethane foam. This is a classic mistake.
Rodents love to gnaw on standard expanding foam, destroying it in just a few minutes. Professional rodent-proofing such as sealing against mice requires durable, industrial-grade materials:
- High-performance elastomeric sealants (such as DOWSIL™): Flexible and resistant to both UV rays and Quebec’s freezing temperatures, without cracking.
- Galvanized or stainless steel wire mesh: The only materials capable of withstanding rodents’ teeth while maintaining continuous airflow.
- Pure copper wool: Does not rust and creates an impenetrable shield for gaps in masonry.
Have your home inspected before the first snowfall
The best time to carry out mouse-proofing (sealing entry points) is from the end of summer through the autumn—before temperatures drop significantly and rodents have already settled in indoors.
Do you hear faint scratching sounds in your walls, or do you simply want to protect your property investment before winter arrives?
Trust the team at Rive-Nord Extermination. We inspect your building’s exterior envelope and provide a sealed, aesthetically pleasing, and guaranteed solution to keep rodents out.