Unless you have a brand new home, your door may have fallen out of alignment. Take the time necessary to make certain your door fits straight and true before you begin weatherproofing. (This extra step will also save on weatherproofing material!) Start by evening out the gaps around the door. Reset and shim the hinges (if necessary) to even out the gaps. Keep in mind that if you plan to attach a new door bottom with a drip edge, you may have to plane the bottom of the door slightly. Then, of course, you'll want to make certain the strike plate and latches are in alignment.
SKILL SCALE Easy TIME REQUIRED Weatherproofing your door should take 35 to 60 minutes. TOOLS Hammer Putty knife Screwdrivers Pry bar Wood chisel Stapler Caulk gun MATERIALS Silicone caulk Non-expanding insulating foam Weatherstripping Wood filler
STEPS
		Install metal tension strips next to the door stops at the point where your door contacts the stops when closed. Use a putty knife to pry out the tension strips far enough so that it creates a good seal when the door is closed.
		Add an aluminum or vinyl door jamb weatherstrip to the edge of the door stop on the external side
		Attach a new bristle sweep to the bottom of the door. Here's an option: You may prefer to attach a new door bottom with an integral sweep on the inside and drip edge on the outside. This often requires that you adjust your threshold height, and/or slightly plane the bottom of your door. If you plane the door, make sure to seal the wood.
		Fix any cracks in door panels or around light panels with wood filler or caulk.