Roof Ponding
Roof Ponding is the retention of water on a low-slope or flat roof caused by a deflection of the roof’s underlying structural components.
Ponding water on a roof causes leaks, algae and fungi growth. If left unattended, roof ponds can lead to the collapse of a roof.
The size of roof ponds increases over time because the weight of the water causes additional deflection of the structural membranes underneath (above left). Eventually, the structure may not be able to carry the increased load. An infrared moisture survey will oftentimes reveal larger areas of wet insulation in the vicinity of the ponds (above right and inset).
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