Therefore, the upper piece of wrap or flashing should always overlap any lower pieces.
Consult the manufacturer’s instructions for the recommended technique for your windows.
If installing a new unit, the self-adhesive flashing will cover the inside of the framing and the sheathing.
Credit: Edmund Barr
Then add small pieces of flashing over the gaps at the corners.
Next, apply abead of caulkto the felt and set the window in the caulk.
Next comes another layer of building wrap, installed like the first layer.
plant the trim just under the drip cap.
This helps ensure water has no chance to seep behind and damage the sheathing.
