Layers of felt paper and liquid tar can last a long time. Proper slope towards the drain is crucial or pooling water can lead to leaks that can never be found.
If there are trees nearby, cleaning the drain filter regularly can be your first step. If the slope is designed to guide water into the eavestrough, regular cleaning is very important. Noticing air pockets (blisters) is an indication of a leak. Blisters must be cut out and sealed with plastic cement. Leaks around the drain are the most common issues with flat roofs. Sealing around the drain with plastic cement can be an option diy project.
Skylight flashing and exhaust vents can be problematic also. Inspecting for cracks and sealing it with plastic cement can stop the leaks. Always tie your ladder when climbing height. A professional roofing contractor is only a phone call away.
We offer full line of flat roofing repair and installation services in the cities of Ottawa, Rockland, Cumberland, Orleans, Vanier, Rockcliffe, Nepean, Barrhaven, Kanata, Stittsville, Manotick, Greely and Gloucester Ontario.