Flat Roof Ponding and Failure
Flat and low-slope roofs require positive drainage to prevent ponding water, which accelerates membrane degradation. Common in commercial buildings and older home additions, a failing flat roof can leak extensively with little outward warning.
Symptoms to Look For
- Standing water visible on the roof surface 48 hours after rain
- Blistering or bubbling in the membrane surface
- Interior water stains below the flat roof area
- Visible cracks or separations in the membrane at seams or penetrations
Common Causes
- Drain scuppers that are clogged or undersized
- Roof deck deflection creating low spots that pond water
- Aged EPDM or modified bitumen that has lost elasticity
- Improper original slope specification (less than ¼" per foot)
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Repair or Replace?
Small flat roof areas (under 200 sq ft) with isolated blistering or seam failure can often be patched. Large areas, widespread membrane failure, or decking rot from long-term ponding warrant full replacement with a properly sloped TPO, EPDM, or modified bitumen system.
Flat Roof Ponding and Failure in Northeastern Pennsylvania
Flat roof rear additions on Scranton and Carbondale row homes are one of the most consistent sources of roof repair calls in the region. These additions were often built with minimal slope, and the original roofing is now 40–60 years old. Snow loading on flat roofs is also a concern following heavy NEPA snowfall.
Areas Where We Fix Flat Roof Ponding and Failure
Dealing with Flat Roof Ponding and Failure?
Don't wait. Call ShingleMe for a free inspection, we'll diagnose the problem and give you a straight answer.