A commercial building in Varennes, on the South Shore, housing a professional services office, was plagued by a carpenter ant infestation that disrupted daily operations and raised legitimate concerns about the structural integrity of the premises. Located in a semi-industrial area on the border of Sainte-Julie, the mixed-construction, concrete-wood-frame building showed visible signs of infestation in the interior partitions and under the flat roof. The building’s managers had initially tried to solve the problem by commercial means, without success. Our team of exterminators in Varennes has taken over to offer a professional and durable solution.
Commercial inspection and location of fireplaces
Commercial inspection requires a discreet and efficient approach so as not to disrupt customers or employees. The diagnosis was carried out outside opening hours, allowing full access to all spaces, including the false ceilings, the technical rooms and the storage spaces in the basement. Carpenter ant galleries were found in the wood studs of the interior drywall, in the frames of the windows overlooking the façade exposed to humidity and in the sections of roofing wood accessible by the technical room. Outside, a pile of wooden pallets stored against the rear façade of the building provided an ideal settlement site for the main settlement. This poor storage practice had encouraged the colony to advance towards the interior of the building via the foundation joints. The extermination of carpenter ants in a commercial environment requires careful planning to reconcile efficiency and continuity of operations.
Two-phase treatment to limit business impact
The treatment program was divided into two phases carried out over the weekend to avoid any disruption to the office’s operations. The first phase consisted of the application of a gel insecticidal bait in the identified galleries and along the hunting routes observed inside. This type of gel, formulated with a transfer insecticide, allows worker ants to bring it back to the colony, gradually eliminating the entire group, including the queen. The second phase, carried out two weeks later, included spraying of residual insecticide concentrate in wall voids and powder injection in hard-to-reach areas. The exterior treatment included the removal and treatment of wooden pallets, as well as an insecticide barrier around the foundation perimeter. Similar achievements in a commercial context are available in this similar case study.
Corrective actions and reorganization of storage
Following the treatment, structural and organizational recommendations were submitted to the building manager. The main risk factor, the storage of wood materials against exterior walls, was the subject of a formal warning with a request for immediate correction. An inspection of the drainage systems and soffits identified several areas of water accumulation that could soften the structural wood. A seasonal outdoor insect treatment program has been integrated into the building’s preventive maintenance contract, with two annual interventions planned in the spring and late summer.
Treatment monitoring and certification
The follow-up visit carried out five weeks after the initial treatment confirmed the complete absence of ant activity inside the building. Managers have received a processing certification to keep in their building maintenance records, which is useful for insurance renewals or regulatory audits. Nova Extermination, a certified exterminator on the South Shore, offers this type of professional documentation to all its commercial customers. For other references in the professional environment, consult this realization in carpenter ants as well as this intervention in anthill documented in our portfolio.