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Spider Squad applies Suspend Polyzone to every property we treat. Here is exactly what it is, how it works, how long it lasts, and why no consumer product available at a hardware store comes close.
Suspend Polyzone is a professional-grade insecticide manufactured by Bayer Environmental Science. It contains bifenthrin at 4.75% as a suspension concentrate (SC) formulation. In Canada, it is registered with Health Canada's Pest Management Regulatory Agency (PMRA) for use by licensed structural pest control operators. It is not available for retail purchase in Ontario or anywhere in Canada.
Bifenthrin is a Type I synthetic pyrethroid - a class of insecticides modelled on the natural pyrethrins found in chrysanthemum flowers, but engineered for greater stability and longer residual activity.
It works by binding to voltage-gated sodium channels in the nerve cells of insects and arachnids. Normally, these channels open briefly during nerve firing and then close. Bifenthrin prevents the channels from closing properly, causing continuous, uncontrolled nerve firing. The result is hyperexcitation, muscle spasms, paralysis, and death.
Critically, bifenthrin kills through two mechanisms:
Any spider in the treatment zone during application is killed immediately through direct contact with the bifenthrin suspension. This includes spiders in webs, on surfaces, and in the upper layer of soil and mulch adjacent to the foundation.
Spiders crossing treated surfaces - foundation walls, window sills, door frames - absorb a lethal dose through their tarsi (feet). This is the mechanism responsible for the 3 to 6 month residual effectiveness. Every spider that crosses the treated zone after treatment is exposed, not just those present during application.
The “SC” in Suspend Polyzone stands for Suspension Concentrate. This formulation technology is what separates professional pest control products from consumer alternatives - not just the concentration of active ingredient, but how that ingredient is delivered and retained on treated surfaces.
Bifenthrin particles in Suspend Polyzone are suspended in water as microscopic capsules. When applied to a surface, the water carrier evaporates and the capsules bond to the surface. Active ingredient is then released gradually as spiders contact the treated zone - not all at once as in solvent-based aerosols.
Concrete, stucco, brick, untreated wood, and similar porous exterior surfaces hold Suspend Polyzone's active ingredient in their microscopic voids. This physical retention - combined with the SC formulation - is why outdoor residual effectiveness reaches 3 to 6 months versus days for consumer aerosol products.
Once Suspend Polyzone has cured on a surface (approximately 2 hours after application), it becomes highly resistant to rainfall. The bonded active ingredient is not water-soluble at the concentrations present on treated surfaces. Light to moderate rain after curing does not remove the barrier.
| Property | Suspend Polyzone (Professional) | Typical Consumer Spider Spray |
|---|---|---|
| Active ingredient | Bifenthrin 4.75% SC | Permethrin 0.05-0.1% or pyrethrins |
| Concentration difference | Approx. 50-100x higher concentration in professional product | |
| Outdoor residual | 3 to 6 months | Days to 2 weeks |
| Rain resistant | Yes, after ~2 hour cure | No |
| Bonds to surface | Yes (SC formulation) | No (solvent carrier evaporates) |
| Available retail in Ontario | No - licensed operators only | Yes |
| PMRA structural registration | Yes | Varies by product |
This is not a marketing comparison - it is a formulation chemistry difference. The residual performance gap between professional and consumer products is a function of concentration and SC technology, not brand or price.
Bifenthrin has low mammalian toxicity at structural pest control exposure levels. The following applies to Suspend Polyzone applied by a licensed Spider Squad technician:
Treated exterior surfaces are safe for people and pets once dry - approximately 30 to 60 minutes after application. Technicians apply to exterior structural surfaces (foundations, eaves, frames) that people and pets do not normally contact directly.
We do not treat flowering plants, vegetable gardens, or open water. Application is targeted at structural surfaces and immediately adjacent harborage zones. Pollinators on flowering plants are not in the treatment zone. Bifenthrin is toxic to aquatic invertebrates and we maintain buffers from water features.
What is Suspend Polyzone?
A professional-grade insecticide by Bayer Environmental Science. Active ingredient: bifenthrin 4.75% SC. PMRA-registered for structural pest control in Canada. Not available for retail purchase - restricted to licensed operators.
How does bifenthrin kill spiders?
Bifenthrin binds to voltage-gated sodium channels in nerve cells, preventing them from closing normally. This causes continuous nerve firing, hyperexcitation, paralysis, and death. Spiders are killed by direct contact during application and by crossing treated surfaces afterward - the residual mechanism.
How long does Suspend Polyzone last outdoors?
3 to 6 months under typical Ontario outdoor conditions. Porous surfaces retain the active ingredient longer. An application in August typically remains effective through October.
Is it safe for children and pets after application?
Yes, once surfaces have dried - approximately 30 to 60 minutes after application. Bifenthrin has low mammalian toxicity at the exposure levels from treated structural surfaces.
Can I buy Suspend Polyzone myself?
No. It is restricted to licensed pest control operators under the Ontario Pesticides Act. This restriction is why professional treatment cannot be replicated with retail products regardless of budget.
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