The flexible material compresses when the door closes sealing the gap along the floor to keep out water dirt cold breezes and critters.
How to reseal the garage door bottom.
A defective garage door seal will allow many unwanted things to get into your garage.
The seal is u shaped and rests in a track on the underside of the garage door.
The garage door bottom seal or door sweep is a long strip of rubber or vinyl that attaches to the bottom edge of the garage door.
Unlike the measurements you took for the top and side seals you will need to measure for the bottom seal by measuring the bottom of the door itself.
Garage door bottom seal for wood doors.
Measure the bottom of the door.
Make sure that you face the inside of the door as you take this measurement.
It can be a vinyl strip too.
Open the door then measure the bottom of the door using a tape measure.
You have to keep your garage clean and it s better blocking the grass bugs leaves or any other dirt than cleaning them all the time.
For example a defective or missing seal will allow dirt debris dust rain and snow to get in.