Diverter Or Cricket Designs

A cricket metal roof penetration flashing is designed and constructed to divert water around a penetration and to avoid ponding.
Either a diverter or a cricket flashing design is required to avoid the build-up of debris behind the back-curb of a square or rectangular penetration flashing. It has to comply with the manufacturer's warranty, and a 1.5° fall is the minimum considered to be self-cleaning.
If the roof pitch is at the minimum of 3°, it is necessary to increase it to provide the 1.5° fall to the back curb. The amount of increase will depend on which angle of cricket or diverter flashing is used. See Cricket Penetration Patterns.
The pitch of a valley, diverter or cricket flashing will always be less than the roof pitch, but the valley pitch depends on the angle of the valley to the roof. See Valley Gutters.


Revision Category: 
0 - Clause Removed
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Clause removed in favour of more detailed drawings in Penetration Flashing Design.

Draft Clause: