Roofing applications

3m waterproofingSeveral things are done to waterproof a roof. This is because just having a roof without any of these extras doesn’t ensure you a completely leak proof roof, and it is the roof’s job to keep water, snow, winds, etc. out of the house. So here is a description of everything that’s done to a roof to make it waterproof. The roof waterproofing with the main drain and secondary drains, flashings, a waterproofing layer like vinyl or EPDM and several coatings. Caulking, mortaring and using other sealants accompanies all these. While drains are not a compulsory part of some roofs, some areas of the country have plumbing codes that make them an absolute necessity.

Draining of roofs

In flat roofs, the importance of having a roof drainage system, i.e., a system of secondary drains attached to the main drain, cannot be underestimated. This is because, being flat, water can pool on them easily. On the other hand, sloped roofs don’t necessarily need it as the incline gets rid of the water effectively. Gutters can either just remove water from the roof and drain it to the ground or take it to a far away place to drain. The former may sometimes lead to your yard flooding, but the latter ensures this doesn’t happen. Roof drains can also have siphons, which get rid of water more efficiently than gravity alone.


Vinyl waterproofing membranes are the strong and heavy duty. They are largely puncture resistant and do a wonderful job of keeping water out. They are even used in green roofs where root punctures are common. In regular roofs, they are installed by heat welding just under the shingles of the roof so that water seeping from between the tiles does not get into the roof. Flashings are installed at the various intersections in the roof- between the outer walls of the house and the roof, in roof valleys, around skylights and chimneys and the rakes and eaves of the roof. Flashings can be made of metals like aluminum, copper and galvanized steel or with rubber and plastic too.

Various materials to waterproofing the roof

The final things used to finish the waterproofing of the roof seal. Seals can make with some things like caulk, mortar, epoxy sealant, etc. These are applied between flashings and tiles, on cracks and other fraying or open ends. Paints and coating made with things like elastomeric vinyl are also used for waterproofing. Checking the roof for damages and pooling water is vital. A damaged roof with accumulated water will result in leaking. Flashings often give way, and repairs and replacements should be done promptly. Good maintenance of a roof guarantees it a long life.