Kickout Flashing at Sidewall

Water is both the most useful and the most damaging liquid. It needs to be moved off of or out of our buildings almost religiously. These details cover the most common flashings for homes, especially the weatherlap — shingle-style shedding of water from one overlapping component to the next. There are very few sealants or caulks in these details (especially compared to the air-sealing details). When caulks or sealants are exposed to liquid water and the sun, they will eventually fail. And when they do, they can trap as much water as they were intended to keep out. There is seldom just one way to flash any one penetration, and never just one flashing material; these details often represent just one of many best practice approaches.

DRAWING DETAIL

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1.
Oct 17, 2015 9:24 AM ET

Caution with site-fabricated kickout flashings
by Douglas Horgan

Our local stucco/EIFS inspector tells me that kickouts made on site often leak at the cut corner. Aluminum flashings can't be reliably sealed in the field; caulks fail and aluminum can't be soldered.
A tiny leak may not cause a problem with some types of assembly, such as siding over a drain cavity, which can handle repeated small leaks. However others such as stucco with minimal drainage space cannot handle even small repeated leaks.
Since factory made kickout flashings have become widely available, we require them on our jobs. In our area they are sold at roofing suppliers, stucco suppliers, and even at big-box home centers.
Having said that, we also allow site-fabricated kickouts made with soldered joints, which obviously have to be made of a metal than can be soldered such as copper or terne-coated stainless.