In case you have had a plumbing accident water in your garage will move to your garage door.
Garage door frame rotted.
Insert the tip of a flat crowbar under the trim.
The main cause of rotted garage doors is water damage.
Usually mold or wood rot is easily recognizable by the telltale dark soggy patches that form around the door frame.
But there are several less obvious symptoms you should be on the lookout for such as.
Pry on the crowbar to lift the trim and loosen it.
Tap on the back of it with a hammer to drive the tip in as far as you can.
To repair rotted door frame first remove rotted wood with a 5 in 1 or other sharp tool.
How to use epoxy on wood for repairs.
Then coat the rotted door frame area with wood hardener as shown.
These dark spots are caused by the growth of fungi as they feed on moist wood.
Some garage doors are.
Mix polyester wood filler or bondo wood filler and press it into the recess with a putty knife.