Why exclusion beats the spray calendar in Calgary

Alberta’s pest calendar is short and sharp. Ants and wasps compress into a handful of warm months. Mice move with the first cold nights, often in September, and they move with intent: from grade, from garages, from the party wall that was never sealed at the sill.

The typical response is a spring perimeter spray and a fall rodent visit. Both can be useful. Neither is a strategy. Perimeter chemistry degrades under UV and irrigation. Snap traps in a boiler room do not teach a property manager why the same room fills every November.

Exclusion changes the economics. A door sweep, a dock seal, and a screened intake are capital events with an operating return: fewer emergency calls, fewer occupant complaints, fewer products in a building that also houses children, patients, or food. In a climate that punishes sealant and hardware, the specification matters — stainless or galvanized mesh, polyurethane that moves, sweeps that meet an uneven slab.

We still intervene when a population is already inside. We do not pretend that intervention is the product. The product is a building that no longer offers habitat.

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