I install a basic window into the 20x30 workshop. For this install I use a new construction window. I cut the tyvek home wrap in a special way that allows for the window sill to be covered completely. A layer of flashing is used on the sill ontop of the tyvek. I place a bead of caulk around the open window and seat the window into place. Lots of screws are used to hold the window in place. I dont use caulk on the bottom of the window so that water could escape if it ever go to that point. Flashing is installed on the sides of the window and lastly on the top to keep all water out.
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