For effectively sealing wood doors, spring bronze or metal interlocking weatherstripping is perfect. As with windows, metal interlocking weatherstrip seals gaps in door frames and door elements with an interlocking design impervious to air leaks. The shape of spring bronze allows it to spring, or adjust, to take up the space between the side of the door and the jam. Add a threshold strip or metal threshold plate, and your exterior door is ready to block air infiltration, heat loss, and have improved soundproofing.
Both types of metal weatherstripping are extremely strong to last for decades, and have sizing options and flexibility to fit almost any size gap around doors.
Stops air infiltration
Prevents heat and/or cooling loss
Reduces sound penetration
Keeps out the elements
Blocks pests from getting inside