Download PDF version (508.2k) Log In or Register to view the full article as a PDF document.

Image

Image

Problem:

No overflow scupper. The parapet wall around this roof has only one scupper on each side, with no overflow scupper. If the primary scupper becomes blocked - by a tennis ball, for example, or in this case, a soda can - then not only are leaks likely to occur, but ponding water on the roof could get heavy enough to threaten the structural integrity of the roof framing.

Solution:

Install a secondary scupper

2 inches higher than the primary scupper to drain excess water in case the primary scupper becomes blocked.
Image

Problem:

Clogged roof drain.

Failure to clear away leaves from a drain strainer can cause ponding.

Solution:

Remind homeowners to check roof drains and scuppers regularly,

and to clean them at least once a year - preferably more often. An overflow scupper is needed here, as well - no roof should ever depend upon a single drain.