Steel Mesh Rodent Exclusion

Case Study: Rats Coming from Neighbours in Old Toronto

This article involves an interior and exterior rat extermination in Old Toronto. It will detail the steps taken in exclusion and treatment, by the technician, to block off the rat’s access to the house and to treat the rats both on the interior and on the exterior. This is located in Bloorcourt Village in downtown Toronto’s west end.

The technicians, before the exclusion, must first inspect and confer with the customer or customer’s on the issue and then must inspect for levels of activity. The customer’s original complaint was rats present both in the home and in the yard. A technician was sent out to inspect for possible rat activity and to treat it.

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Bloorcourt Village, Toronto: A Populated And Busy Part Of Toronto

Bloorcourt Village is a place for shopping, industry and restaurants. It is one of the most active Business improvement areas in the city but is also plagued by old and damaged buildings as well as infestations of pigeons and other small animals and birds that cause extensive damage to this city centre. Having a mall directly beside the residential area that is already surrounded by restaurants and businesses can attract unwanted rodent attention.

 Exterior Inspection 

The technician came on site and inspected the exterior of the home. It was found that the rats had many entryways they could use to enter the home including foundation gaps and a wall vent.

Broken Wall Vent Rodent Entry Point
Rats can fit through holes less than an inch wide. Any opening wide enough on the exterior of the home can let rats in.
Foundation Gaps Rodent Entry
As burrowers, rats will dig in the yard and find their way in the house by crawling through cracks in the foundation.

Interior Inspection

The technician discovered that rats appeared to be coming from the neighbour’s drop ceiling. There were missing bricks with entry holes that were coated in the grease from rat fur. This location is very important to seal off. Rats were also seen heading down a drain in the cold storage room.

Pipes Rodent Movement
Rats are excellent swimmers, too. They have been known to use drain pipes to go from place to place.

Initial Measures

Rodent bait stations were placed in areas of high activity outside of the house to reduce the external rat population. Snap traps were placed on the inside of the house and were baited to catch rats inside so as to prevent them from dying inside of the walls of the house.

Rodent Bait Station Outside
Bait stations contain a rodenticide that is specifically designed to appeal to rats. They also require a key to open.


The proposed exclusion was extensive. A wall vent needed sealing and a third bait station was installed on the outside of the home. Thirty-nine feet of galvanized steel mesh was installed to seal the home off from the next-door neighbour. This exclusion sealed off the areas in between the basement ceiling rafters that rats were using to come indoors from the attached home.

Galvanized Steel Mesh Exclusion
Galvanized steel mesh is a durable and flexible material that can withstand the chewing and tearing of animals.
Plastic Wall Vent Rodent Entry Point
Rodents can climb brick and chew through wall vents, where they can make their way into the house.
Galvanized Steel Mesh Exclusion Ceiling
Holes between the homes were allowing rats to move from one place to the other.
Caulking and Mesh Exclusion
Caulking was used in conjunction with the mesh in some area to ensure that all cracks were sealed.


The treatment was very successful and the rat population dropped dramatically. The exclusion was effective against stopping rats from moving from one house to the other and the customers were pleased with the work.