When selecting the most effective roof waterproofing method, the following are some of the most important considerations to keep in mind: Here are some of the best practices that are frequently used when it comes to waterproofing the roof of a house: 1. Liquid Waterproofing Membrane Description: One can define it as the item which in its initial state is a liquid that forms a single strong protective layer of elastomeric material upon becoming solid. Waterproof, sealing requires integration