Table of Contents
Job Overview
Location: Toronto, Ontario
Structure: Two-story, detached house
Problem: Rat activity inside and outside the residence, with entry points identified behind the basement drywall and along the foundation
Service: Rat treatment, one-way door installation, foundation exclusion, HEPA vacuuming, and disinfection
Visits: 3
Summary
Our team at The Exterminators completed a three-visit rat treatment and structural exclusion service at a two-story detached house in Toronto, Ontario. The homeowner reported rat activity both inside the residence and around the exterior of the property.
During the initial inspection, our technician confirmed rat activity and investigated potential entry points. Exterior treatment was initiated using commercial-grade rodenticide secured inside large, weighted, tamper-resistant bait stations.
Following the inspection, the homeowner approved additional exclusion work. Our team removed approximately six feet of basement drywall and insulation to access the concealed entry points. A one-way door was installed at the main opening, and galvanized steel mesh was used to secure the affected wall area.
An additional 15 feet of foundation gaps were excluded using black rubber-coated galvanized steel rodent mesh reinforced with crushed limestone. HEPA vacuuming and disinfection were also completed behind the drywall.
At the final visit, the homeowner reported no further rat activity. The exclusion was inspected and found effective and functional, and the one-way door was removed.
Background / Property Context
The property was a two-story detached residential house with reported rat activity affecting both interior and exterior areas.
The basement contained finished wall sections that concealed portions of the foundation and associated utility penetrations. Access to these areas was limited by drywall and insulation.
The inspection photographs documented confined spaces around the foundation, including exposed plumbing, wooden framing, loose construction debris, and openings along the lower structural surfaces.
One photograph showed an irregular opening in the foundation area near a plumbing connection. Other images documented black protective screening installed around plumbing and along the foundation perimeter.
These conditions were relevant because concealed foundation openings can provide rats with access to interior wall cavities and basement spaces.
The exclusion work required access behind the finished basement wall to address the identified openings directly.
Customer Concern
The homeowner contacted our team after observing rat activity both inside the house and around the exterior.
The reported interior activity indicated that rats had gained access to the building rather than remaining exclusively outdoors.
The homeowner was concerned about continued rodent movement through concealed openings and wanted the active infestation treated while preventing further entry.
Following the initial assessment, the homeowner approved additional exclusion work targeting the basement and foundation openings.
Inspection & Findings
Visit 1 – Rat Activity Assessment and Entry Point Inspection
Our technician, Richard, attended the property to investigate the reported rat activity.
The inspection confirmed rat activity and included an assessment of potential entry points around the house.
The investigation identified openings requiring exclusion, including areas concealed behind the basement drywall and along the foundation.
The supplied photographs documented several relevant structural conditions:
- An irregular opening in a foundation area near a plumbing connection.
- Exposed plumbing components passing through confined structural spaces.
- Gaps and voids around lower foundation surfaces.
- Loose soil, stone, and construction debris within the inspected spaces.
- Black protective mesh installed around foundation openings and plumbing components during the exclusion work.
- Restricted access around wooden framing and mechanical services.
The opening near the plumbing connection was particularly relevant because gaps around service penetrations can provide routes for rodents to enter concealed spaces.
The inspection established the need for physical exclusion in addition to the exterior rodent treatment.
A quotation was provided for the proposed structural exclusion work.
Cause Analysis
Rats can enter residential buildings through openings around foundations, plumbing penetrations, and gaps concealed behind finished basement walls. At this property, the identified foundation openings provided potential access routes between exterior areas and concealed interior spaces. The enclosed conditions behind the drywall could allow rodents to move through the structure without being readily visible. Effective exclusion required securing these openings with durable physical barriers.
Treatment / Removal
Visit 1 – Exterior Rat Treatment
Following the inspection, our team initiated rodent treatment around the exterior of the residence.
Large, weighted, tamper-resistant bait stations containing commercial-grade rodenticide were installed outside the house.
The stations provided secured placement for the rodenticide as part of the treatment program targeting rat activity around the property.
The exterior treatment was intended to reduce the active rodent population while the identified structural entry points were addressed.
Rodenticide treatment was performed by a licensed exterminator in accordance with Ontario Ministry of the Environment guidelines and applicable provincial pesticide regulations.
Visit 2 – Basement Wall Access and One-Way Door Installation
After the homeowner approved the exclusion proposal, our team returned to address the identified basement openings.
Approximately six linear feet of drywall and insulation were removed to expose the affected foundation area.
Removing these materials provided access to the concealed openings and allowed the technician to install physical barriers against the foundation.
A one-way door was installed at the main entry point behind the basement drywall.
The device was intended to allow rats to exit the concealed space while preventing re-entry through the same opening.
The one-way door remained in place until the follow-up visit.
Visit 2 – HEPA Vacuuming and Disinfection
Following access to the affected basement wall cavity, our team completed HEPA vacuuming and disinfection.
HEPA vacuuming was used to remove accessible debris and potentially contaminated material from the exposed area.
Disinfection was then performed as part of the interior remediation work.
This cleaning addressed the accessible sections behind the removed drywall and insulation.
Exclusion & Repairs
Visit 2 – Galvanized Steel Mesh Installation Behind Drywall
The basement exclusion involved securing the identified openings behind approximately six feet of removed drywall and insulation.
Galvanized steel mesh was installed across the affected areas to prevent rats from entering through the foundation openings.
The screening formed a physical barrier between the concealed foundation gaps and the interior wall cavity.
The installation was completed around the accessible structural components while accommodating existing plumbing and framing.
Foundation Gap Exclusion – 15 Linear Feet
In addition to the basement wall exclusion, our team addressed approximately 15 linear feet of foundation gaps.
Black rubber-coated galvanized steel rodent mesh was installed along the affected foundation sections.
The mesh was reinforced with crushed limestone to provide additional protection around the identified openings.
The supplied photographs showed black screening positioned along the lower foundation surfaces and around plumbing components.
Several images documented the screening extending into confined spaces, with crushed stone visible around and over sections of the protective mesh.
The screening was fitted around existing structural elements to address accessible gaps along the foundation.
Plumbing and Foundation Penetrations
One inspection photograph showed an irregular opening near a plumbing connection within a confined foundation area.
The opening was surrounded by loose material and construction debris.
Subsequent photographs showed black protective mesh positioned around plumbing components and along nearby structural surfaces.
These areas required particular attention because openings surrounding pipes can provide access to concealed spaces.
The installed screening formed part of the overall foundation exclusion intended to restrict rodent movement through these gaps.
Interior Wall Restoration
The service notes confirmed removal of approximately six feet of drywall and insulation to complete the exclusion work.
The supplied photographs documented the foundation conditions and protective screening but did not confirm replacement of the drywall, insulation, or finished wall surfaces.
The documented repairs therefore consisted of structural rodent exclusion and associated foundation reinforcement.
Outcome & Confirmation
Visit 3 – Final Inspection and One-Way Door Removal
Our team returned for a third visit to evaluate the results of the rat treatment and exclusion work.
The homeowner reported that rat activity was no longer being heard or seen inside or around the residence.
The technician inspected the completed exclusion and confirmed that the installed barriers remained effective and functional.
The one-way door was removed during this final visit.
The homeowner expressed satisfaction with the completed work.
At the conclusion of the three visits, no further rat activity had been reported, and the documented basement and foundation exclusion measures were functioning as intended.
Technician Notes
The initial inspection confirmed rat activity affecting both the interior and exterior of the residence.
Exterior rodent treatment was initiated using commercial-grade rodenticide placed inside large, weighted, tamper-resistant bait stations.
The investigation identified foundation openings and concealed access points behind the basement drywall that required physical exclusion.
Following homeowner approval, approximately six feet of drywall and insulation were removed to access the affected wall cavity.
A one-way door was installed at the main basement entry point, and galvanized steel mesh was used to secure the identified openings.
An additional 15 linear feet of foundation gaps were excluded using black rubber-coated galvanized steel rodent mesh reinforced with crushed limestone.
The photographs documented an opening near a plumbing connection, confined foundation spaces, and protective screening positioned around pipes and along lower structural surfaces.
HEPA vacuuming and disinfection were completed behind the basement drywall.
At the third visit, the homeowner reported no further rat activity. The exclusion was inspected and found functional, and the one-way door was removed.