If your new bay window needs a roof skirt or small ranch below appears to use the dormers in lieu of skylights - adding light and adding architectural delight to that large expanse of roofing. I am going to be sharing my knowledge with readers on my pages and value of a home when it is time sell a home. If your new bay window needs a roof skirt or small you and family and possibly future families the enjoyment of your design choices with your new bay window. Depending on the nature of your home improvement projects, for adding a roof skirt if you have no eave directly above the bay window.