What Actually Attracts Cockroaches to Your Montreal Apartment?
Let me start by killing the biggest myth in pest control: cockroaches are not attracted to dirty homes. They are attracted to resources. Specifically three things: moisture, warmth, and food — in that order.
The cleanest apartment in Montreal can have cockroaches if it shares walls with a unit that has a leaking pipe, if the building has poor waste management, or if the previous tenant left behind an established colony.
Understanding what actually attracts them is the first step toward getting rid of them.
The Three Attractants — In Order of Importance
1. Moisture (The #1 Factor)
Cockroaches can survive weeks without food but only days without water. Moisture is the single most important attractant.In Montreal apartments, the main moisture sources are:
- Leaking faucets and pipes — under the kitchen sink and bathroom vanity. Even a slow drip is enough.
- Condensation — around toilet tanks, cold water pipes, and poorly ventilated bathrooms
- Pet water bowls — left out overnight
- Wet sponges and dish rags — left in the sink
- Drip trays — under the fridge and houseplants
2. Warmth
German cockroaches — the species you almost certainly have in a Montreal apartment — thrive at room temperature. They cannot survive Canadian winters outdoors. Your heated apartment is their permanent home.They gravitate toward the warmest spots:
- Behind the refrigerator (the motor generates heat)
- Behind the dishwasher
- Around the oven and stove
- Near hot water pipes
- Inside electrical panels and around electrical outlets
3. Food
Cockroaches eat almost anything organic. Their definition of food is broader than yours:- Crumbs (obvious)
- Grease residue on stovetops and behind ranges
- Soap residue
- Toothpaste
- Cardboard glue
- Book bindings
- Pet food
- Human hair and dead skin cells
- Other cockroaches (dead ones)
Building-Level Factors You Cannot Control
Shared Plumbing
In Montreal apartment buildings, plumbing stacks run vertically through every unit. Cockroaches travel along these pipes from floor to floor. The gaps around pipes where they enter each unit are highways.Garbage Room
A building garbage room with overflowing bins, food residue, and poor ventilation is cockroach paradise. The insects breed there and migrate to nearby units.Adjacent Units
Your neighbor's cockroach problem is your cockroach problem. In multi-unit buildings, cockroaches move freely through shared wall cavities, electrical conduits, and plumbing penetrations. You can maintain a perfect kitchen and still have cockroaches coming through the wall from next door.Building Age
Older Montreal buildings (pre-1970) have more harborage points — cracks, gaps, void spaces — than modern construction. The gap behind a 1950s medicine cabinet or the space inside a plaster-and-lath wall provides exactly the dark, undisturbed environment cockroaches prefer.What You Can Control
In Your Unit
- Fix all leaks immediately — this is the single highest-impact action
- Clean behind appliances monthly — pull out the stove and fridge, clean grease and crumbs
- Seal food in airtight containers — not just cereal boxes, everything
- Empty garbage every evening — never leave food waste overnight
- Wipe counters with a disinfectant before bed
- Dry the sink — do not leave standing water in the sink overnight
- Seal gaps around pipes under sinks with steel wool and caulk
- Reduce cardboard — cockroaches eat the glue and hide in the corrugation. Use plastic bins for storage.
- Use gel bait — small dots of professional-grade gel bait (Advion, Vendetta) in cracks and corners are more effective than sprays
With Your Landlord
- Report cockroach activity immediately in writing
- Request building-wide treatment, not just your unit
- Request that the garbage room be cleaned and treated regularly
- Request that plumbing penetrations between units be sealed
Frequently Asked Questions
Can cockroaches come through the drain?
Oriental cockroaches (the larger, darker species) can come up through floor drains, especially in basements. German cockroaches (the smaller, lighter ones) do not typically travel through water-filled drain traps. If you are seeing cockroaches near drains, it is more likely they are traveling along the outside of drain pipes through wall cavities.If I keep my apartment perfectly clean, will the cockroaches go away?
Cleanliness helps but does not solve the problem alone in a multi-unit building. If the source is a neighboring unit, the garbage room, or the building infrastructure, cockroaches will continue entering your unit regardless of how clean it is. You need building-wide treatment plus your personal sanitation efforts.Got a pest problem?
Extermination DMP serves Montreal, the South Shore, Laval & the West Island — 24/7.
Call 438-879-5706