Selkirk SURE-TEMP Premium Series 206830 Roof Flashing, Aluminum, 31-7/8 in OAL, 27 in OAW

Flashings are used to seal the opening where the chimney penetrates the roof and to divert rain and snow down from the roof and away from the chimney system. A Series of adjustable flashings are available depending on your roof pitch. A flat and low pitch flashing is used to seal flat and low pitch roof (up to 2/12 pitch) openings. To determine your roof pitch, measure the number of in from the end of a level ruler down to the roof. This is the rise for 12 in of run. A rise of 5 in is a 5/12 pitch. 4 in, a 4/12 pitch and more.