The initial call to the property was for mice activity in the attic. Often this kind of activity is not from the European House mouse as they cannot climb and jump anymore. They can infest a home and can infest the attic but in their case, it can take time and you will surely see signs of their activities long before they reach the attic. It is more likely that your attic has been infested by native wild mice. Wild mice are native to Ontario and spent most of their evolution without human interaction.
They are not in your home for food, in all likely hood they do not know your house contains food. They live and nest and breed in the attic but hunt for food outside. If you have wild attic mice then you will have trouble telling what it may be. The sound from your attic will be a light rustling and the sound of chewing. If you have attic mice it is important to treat them quickly as they can easily chew through electric wires and cause an attic fire.
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The initial inspection of the exterior revealed a large number of entryways on the exterior of the house. Several wall vents, roof vents and soffit openings were found. Soffit openings, as well as facia vents, roof vents and wall vents, are all common access points for rodents. Mice can fit through an opening as small as a quarter so getting all possible entryways sealed is a smart idea.
The interior inspection of the inside of the house found zero mouse activity in the house proper. However, when the attic was inspected the activity was not just high but dangerously so. Mice carry parasites, especially wild mice who can carry fleas and ticks. Ticks can transfer Lyme disease which is an incurable illness and Hantavirus which is a deadly respiratory illness that is common in poverty-stricken countries.
The initial measures taken by the technician included laying down tamper-proof bait stations containing commercial-grade rodenticide were placed in areas of high activity in the attic. These bait stations can rapidly kill off a mouse infestation while causing the mice to desiccate entirely when they die. They have no smell and cannot produce bacteria so it is safe for them to die in the walls and insulation.
The proposed exclusion by the technician was involved and encompassing. Six feet of galvanized waterproof steel mesh was used to seal off an accessible area at the front of the house. The soffits were accessible by small rodents like wild mice. Eight Roof vent covers were also installed. Black rubber-coated roof vents with narrow steel openings can allow the roof vent to continue functioning but prevent ingress by rodents and wild animals. Over a dozen weep vents were found around the exterior, while these may seem too small for a mouse to squeeze through they are not and need to be sealed with galvanized steel vented inserts.
In conclusion, the exclusion performed on the exterior of the home was highly effective as was the commercial-grade rodenticide treatment on the interior of the attic. The issue has since been dealt with and the customers have not seen any new infestation since.