Patio cover flashing to house

I have a two story stucco house and between the first floor ceiling and second floor floor there looks like an existing sheet metal horizontal exterior flashing (embedded in the stucco but jets out about 1/4 inch) across the stucco wall. The vertical stucco wall is flat. When I install the new flashing for the patio cover do I flash in above or below the existing flashing? Is there a web site showing what kind of flashing to use and installation methods? Thanks.
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Not much room under that z-strip for inserting a flashing, as they usually only cover about 1/2 inch. What kind of "cover" needs flashing? Is this a fabric, or is it something else? Need more info, please. Tom
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I try to do a conventional type roof - 1/2" plywood 4x8 sheets, roofing felt paper on top and then composition shingles.
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Hard to imagine what to do with this minimal description. If existing flashing sticks out perpendicular to stucco, you might try using a rubber or plastic mallet to pound it so it is near vertical, with the edge down. Then underlap or insert the new "L" flashing under this lip. Installing flashing abutted onto the stucco, over the existing jutted-out piece, will not make a waterproof joint. In fact, if the jut is only 1/4 inch, the underlap approach may not work either. Might be best to chip out all the stucco for a couple inches under the lip,so you have more material to overlap the new flashing. Also check out patio and deck handbooks at stores, to see how to properly flash any new shelter or roof addition such as you contemplate.

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