There is no bad type of coating. The key is to select the proper coating in recognition of the needs of the building. For example, it is advisable to opt for a more flexible membrane when the building structure is given to change in reaction to temperature changes. In the case of a roof terrace or a green roof, it is best to check with an consultant.
Specifically for the temperatures in Quebec, the best choice is the two-layer elastomer. It consists of two hot-melted modified bitumen membranes. It is recommended to use this system for flat roofs and green roofs.