A flat roof on a home is a unique challenge because it doesn’t shed water as quickly as a pitched roof, so it needs a roofing system designed to handle standing water and prevent leaks. The most common and effective flat roof systems include single-ply membranes like TPO (thermoplastic polyolefin) and EPDM (ethylene propylene diene monomer), as well as built-up roofs (BUR) and modified bitumen. These materials are selected for their waterproofing abilities, durability, and flexibility to handle temperature changes without cracking. Flat roofs also need proper drainage and a slight slope—even a few degrees—to avoid pooling water, which can lead to leaks and structural damage over time.
To check your flat roof yourself, start by walking around and looking for standing water, cracks, blistering, or seam separations in the membrane. Make sure drains or scuppers are clear of debris. It’s also worth inspecting the flashing around vents, chimneys, and edges to spot any cracks or gaps where water might get in. If you notice frequent pooling or visible damage, it’s a good idea to call in a professional roofer. When consulting with a contractor, ask about the expected lifespan of their recommended system and how they handle warranties, especially for labor and materials. You can also inquire how the roofing system is installed to ensure water can’t get trapped underneath, because a well-installed flat roof needs to protect the home for many years without costly repairs.