Shut the garage door and go outside to seal up all the gaps.
How to fill in garage door gap.
Install a garage door threshold.
Lay down a strip of vinyl weather stripping and transfer the measured length on it.
Gaps along the sides and top of the door.
You can buy them in any diy store and they re very easy to install.
3 place the vinyl strip on the wall side where the wall meets the garage door.
Use your scissors and cut this size.
They come with a rubber threshold and glue and sometimes a caulking gun too.
Garage door stops strips of trim running along both sides and the top of the door opening cover the gaps between the door s edges and jambs and provide a weather seal by means of a flexible flap or flange that overlaps onto the door when it s closed.
The flexible vinyl strip has to cover the gap to lay flush on the door and its part with the screw holes should face the side wall.
Take your measure between the garage door and wall.
2 measure the garage door height.
After shimming the jamb you still have a gap that can allow air to flow and covering this gap with casing doesn t always provide enough insulation.
Https amzn to 2yolagt universal rubber garage door bottom.