Gaps around the perimeter of your door will produce drafts and force you to spend more money on heating or cooling your home. Sealing a door with weatherstripping is a good way to save energy, and it's a process you can usually do yourself without the help of a professional.(From wiki How)
Part One:Basic Preparations
1.Tighten the hinges on your door. Some drafts can be caused by loose hinges, so before you seal the edges of your door, you should take a few minutes to tighten any hardware.
Lift the door by the doorknob. If you can move it upward, the the hinges are probably loose. Use a screwdriver to tighten the screws holding the hinges in place.
If the hinge screws spin but won't tighten, you will need to replace them. You may also need to fill the holes with wood plugs and re-drive the new screws into those plugs.
Similarly, if the doorknob itself moves when you lift it, you should tighten or replace it.
2.Check the old weatherstripping. If your door had weatherstripping previously installed, it might be damaged or deformed. Check by running your hand around the perimeter of the door while the door is closed.
If you can feel a draft while checking the seal, you will need to remove the old weatherstripping and replace it with a new seal.
To remove old weatherstripping, simply peel or slide it away
3.Clean the area.Use a damp rag to wipe away any visible dirt and debris from the door frame and the edges of the door itself.
Drag the edge of a paint scraper along the top, bottom, and sides of the door and door frame to remove any stuck debris from these surfaces.
Check the threshold (the bottom of the door frame). If there are grooves along the threshold, run a large nail through the grooves to scrape away any gunk that has gotten itself lodged in there
4.Buy new weatherstripping. There are several different types of weatherstripping available, so you'll need to decide which one you wish to use.
For the top and sides of your door, wrapped foam weatherstripping is durable and works well with gaps of various sizes. Weatherstripping with a wooden shell is durable yet easier to work with than metal weatherstripping, so it makes a good choice for someone who has no prior experience sealing doors.
If purchasing a weatherstripping kit, note that most kits only contain weatherstripping for the top and sides of your door. You will need to purchase a separate door sweep.
For the door sweep, consider using a metal door sweep with a flexible vinyl flap for greater durability. This type of sweep is also fairly easy to install. Brush or auto-lift vinyl seals are usually the most versatile and easiest to work with, especially when you've never sealed a door before. More advanced options include storm-proof seals and roller door seals.
Note, however, that rigid door sweeps will not work if the carpet is higher or even with the threshold. When rigid door sweeps won't work, use flexible bulb weatherstripping made of vinyl.
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