A special rubber loop strip cut to fit your door bottom-
After dealing with the window, sound control in a room should go to the door: a typical interior style hollow core door will pass sound quite readily. (An STC of much less than 20- this means conversation can easily be heard). It should be replaced with a solid, exterior door, the thickest you can find. "MDF" (Medium Density Fiberboard) doors are cheap and have good sound blocking qualities.
Make sure it's well fitted to the frame, no gaps or crevices for sound to migrate through. If there is, use closed cell tape, (not from the hardware store). The door should be sealed off as if it was 40 degrees below zero on one side. If it has a gap over 3/4" at the bottom, use a threshold on the floor to meet the bottom of the sweep. 36" max length for standard price, longer than 36" door sweeps are availble, see the other listings.
Discounts for quantity orders!
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PLEASE ENTER YOUR DOOR WIDTH MEASUREMENTS IN THE NOTE SECTION OF YOUR ORDER!!! (Or call - email us with it).