How big do crickets need to be?
Roof crickets are the roof design element to slow down and redirect water coming down the roof above a large roof protrusion (chimney, skylight or wall). If this is not done, then water can splash over the back saddle flashing and cause a leak. The minimum requirement is that a cricket or diverter be in place on all protrusions wider than 30 inches. However, there are a number of variables including the total surface area that will drain directly behind the protrusion that may change the size of the cricket. In Florida there exists a very common roof design where a roof slope drains into a horizontal wall. The cricket should be installed to enhance the flow of water away from the roof to wall intersection. If there is some doubt as to the size or configuration of the cricket, please consult an engineer for the proper design based on roof slope, expected maximum rainfall and drainage area.
