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12. What kind of flashings should stucco
The most important types of flashings are good window header and sill flashings. These flashings direct water away from the top of the window. That means that water running down the wall will be directed away from the sensitive window location. The sill flashing directs water from a window away from the sensitive locations below a window. We have all seen stains under a window in one or two locations. These are usually found in conjunction with the drainage or weeper holes from a window frame assembly. The entire window takes the impact rain and the running rain and gathers it up into the window track and two or three small drainage holes allows the water to run down the stucco. If the window was dirty…as they usually are…with salt or dust or pollen etc…then this dirt is dissolved in part and runs down the stucco wall. The stucco wall, being porous, absorbs the dirt and will stain over time. Window sill flashings eliminate this stain and protect the bottom of the window.