How to Make Your Doors Draft-Free with Weatherstripping

To seal the door bottom, place the door on sawhorses and use a square to mark out a 5/8-inch-wide dado centered on the door's bottom edge. Tom sets the router's guide so a ½-inch bit will cut next to the top mark when the guide rests on the door's top face. On the first pass, move the router from left to right. On the second pass, the guide rides on the door's opposite side as the router moves from right to left. Make multiple passes to reach full depth (1⅛ inch).