Waterproofing Reinforcing MeshMapei 150 Reinforcing mesh used with Hydrobar to waterproof horizontal surfaces sold per square meter. The mesh is made from glass fibres treated with a special primer which makes it resistant to alkalis. Once the waterproofing layer where it is installed has hardened, Mapenet 150 reinforces the layer to protect against the formation of cracks due to movement in the substrate or the tiled surface. It also makes it easier to apply an even layer of the