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Cut a strip of 6-inch-wide waterproof membrane 1 foot longer than the window is wide. Center it under the window and adhere it to the wall so it covers the bottom nailing fin.
Cut two more strips of membrane 1 foot longer than the height of the window and repeat the above process on both sides of the window. Make sure each strip's lower end overlaps the strip under the unit.
Cut two more strips of membrane 1 foot longer than the height of the window and repeat the above process on both sides of the window. Make sure each strip's lower end overlaps the strip under the unit.
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