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How to weatherproof a door
Use adhesive weatherproofing strips.
Before using adhesive weatherproofing products, thoroughly clean the area according to the directions on the weatherstrips. Once the area is dry, remove the backing of the adhesive strips a little at a time as you press them into place on the door jambs and along the edges of the doorframe.
Modern doors are usually designed with grooves along the sides and jambs that weatherstripping can be inserted into. Sometimes it can be difficult to apply an adhesive strip by yourself.