The repair of potholes is largely dependent on the weather. The long-term solution to potholes is to pave or reconstruct the street. Potholes will not usually form on pavement that is in good condition, that keeps water out from under the pavement, and that is designed for the type of traffic that uses it.
Permanent hot asphalt patching of potholes on streets typically takes place during the summer months on a priority basis as determined by, site inspections, and service requests from residents and Council. Also provides for winter pothole patching on an ‘as required’ basis.
Cold Asphalt Patching
Cold patch, also known as cold mix or cold asphalt, is a way to make road repairs quickly because it can be applied right from the container without heating. It can be used with little or no preparation work. It is simple to work with. Cold patch can be applied under all weather conditions. Cold asphalt also does not require any special skills, heavy rolling machines, or special applicators as it can be shoveled or poured into a pothole and tamped down with a hand tool. Cold asphalt patching material also freezes and becomes hard during the winter months. Repair crews must often use a tiger torch (portable torch) to heat the cold patch material in order to make it pliable when the temperature goes below freezing.
What causes potholes?
Potholes are formed when asphalt ages, it becomes more porous, allowing rainwater and melting snow to penetrate the surface. In cold weather, the water that has drained through to the foundation freezes to form pockets of ice; the ice expands and warps the pavement. When the temperature rises above freezing, the pockets of ice melt and leave voids beneath the road surface. The unsupported pavement collapses under the weight of the traffic resulting in potholes. The pothole expands as traffic continually hits the hole.
Why do the potholes re-appear?
The material used to repair potholes does not stick as well to the surrounding pavement when it is cold or wet outside. Repairs made during the winter may/will not last as long as repairs made to dry, warm pavement. We cannot wait until warmer weather to repair the potholes as the potholes must be repaired for safety reasons.