Waterproofing isn’t one-size-fits-all, and choosing the wrong method—or doing it badly—can waste money without solving leaks.
Common methods include liquid waterproofing coatings, membranes, and cementitious systems. Liquid coatings are applied like paint and create a continuous protective layer. Membranes (like bituminous rolls) are laid across the surface and sealed at joints. Cement-based options mix with plaster or screed to add resistance.
Which one your building needs depends on the roof’s condition, climate, and existing layers. If there are many cracks and uneven areas, surface preparation becomes critical before any system goes on top.
Look at past history. If the building has repeatedly used cheap coatings that only last one season, it may be time for a more robust system, even if the upfront cost is higher.
It’s worth consulting a waterproofing specialist rather than just a generic contractor for big roof jobs. A proper diagnosis saves you from repeating the same work year after year.