Z Flashing at Lowes.com protects siding with Z Weather Strip Flashing
The Z has squared corners and is often used at the horizontal joint between two sheets of plywood to provide protection from water.Because the end-grain wood at the top and bottom of plywood sheets is easy to absorb and hold water, it is important to protect it.
Because the end of the original panel had developed wood rot and delamination from the splash-back of rain at the ground, it was installed between the bottom piece of new plywood.Unless you don't mind doing the repair again soon, it's important to seal the cut-off end of the original plywood sheet and the new one with primer and two coats of paint.
The walls of a home have to be able to repel water just like a roof and, once you think of the exterior walls as a vertical roof, that has rain beating against it and water draining down it, you have the correct mind-set to evaluate.The Z-flashing provides the same level of protection at the edge of a roof.
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If you want to read all of our articles on this topic, you can go to the INDEX or the EXTERIOR WALLS AND STRUCTURE page.