is designed to work even with it flush to the window frame. End-Cuts for Lineal Installation Around Doors and Windows Bottom or Sash Lineal Remove a 3/4" - 7/8" section from the flat edge, and a 3/4" - 7/8" tab from the receiving channel. Removing these pieces allows the side lineals to be installed, and clearance for siding panels. Side Lineal Side lineals have different cuts at both ends. The bottom end will always be miter cut 45 and the miter will always start from the receiving channel. A tab 3/4" deep is removed from the receiving channel for the application of siding panels. The upper end can be cut two ways: for a 45 corner or for a butt joint header. When using 45 miters around the entire window, remove a 3/4" - 7/8" tab from both the receiving channel and the flat edge of the lineal. Removing these tabs allows clearance for the application of siding, and for proper water drainage. If applying a header using a butt joint, simply square the end. Top or Header Lineal There are also two ways to cut a header lineal: for a 45 miter, and for a butt joint. When using a 45 miter, cut both ends the same way as shown for the bottom end of side lineals EXCEPT do not remove the 3/4" tab from the receiving channel. Instead, make 3/4" deep slits to create 3/4" rain tabs at both ends. When applying a butt joint header, square up