Torch-down roofing is a type of flat roofing system that uses modified bitumen sheets applied with heat, creating a durable, waterproof surface. However, one common issue with flat roofs, including torch-down roofs, is ponding water—areas where water collects and doesn't drain properly. This happens mainly because flat roofs don’t have enough slope for water to run off easily. Causes of ponding water include poor design, clogged drains, or roof debris blocking water flow. Over time, these puddles can accelerate wear on the membrane, potentially leading to leaks or membrane damage if left unaddressed. To diagnose ponding water, safely walk your roof when it’s dry and look for depressions or areas where water pools after rainfall. Be cautious not to damage the roofing surface with sharp tools or shoes, and avoid roof inspections during or immediately after heavy rain to prevent slips or falls.
If you notice ponding water, you can try some simple DIY checks like clearing debris around drains and gutters or using a broom to gently nudge water towards drainage points. However, complex fixes like improving drainage or adding tapering to the roof substrate require professional roofing experience. Call a roofer if you see lasting puddles after rain, notice cracks or bubbles in the membrane, or if your roof warranty requires expert repairs. When contacting a contractor, ask, “How will you ensure proper drainage to prevent future ponding water?” and “Does the repair or replacement work comply with my roofing system’s warranty?” These questions help clarify that the solution will be both effective and warranty-safe.