You’ll have to line these locations with metal flashing and seal the perimeters using a caulk gun. Pieces of valley flashing can be Reduce to condition with tin snips, overlapped, and completed with sealant from roof peak to edge. There are 2 pieces to a roof: its supporting framework and https://cashtjare.blogocial.com/the-5-second-trick-for-roofing-62830296