You can go with a wooden brace but depending on the load on your garage door header the sag could reoccur overtime.
How to fix a sagging wooden garage door.
How to fix a sagging garage door step 1.
Locate the gaps and where the door is tight.
A wooden garage door may sag in the middle if it is bumped with a car or other large object in the garage but there are less obvious reasons that can cause such a door to sag.
You may need to add a second screw.
The tracks keep the garage door rollers in line.
To install the extra header jack your door up to correct the sag and bolt in the beam.
Tighten screws gradually and watch the trim to make sure you don t.
Close the garage door.
Inspect the door from inside or the side from where you can see the hinges.
Over the years the garage door header has sagged du.
To do this you will need to position the rods diagonally top to bottom on the back of the door.
You can then straighten them which will in turn straighten out the door.
Using a ladder visually inspect both of the garage door tracks.
Make sure you have enough light to work with.
By using a steel beam there is less chance of a re occurrence in the sag.
It s common in sagging doors for the hinge side at the bottom to be tighter against the frame.
Visually inspect the rollers and their brackets.
Sagging garage door that sagging garage door is getting harder and harder to open.
Garage doors especially older wooden models are as susceptible to the ravages of time and gravity as the rest.
Find the sagging door s cause.
Drill through the jamb countersink the screwhead with a countersink bit.
Drive a screw near the middle of the area where the door is rubbing.