Most garage door maladies are easy to diagnose and repair. Here's how to remedy the most common problems.
Why do garage doors malfunction? Though not the sole culprit, moisture plays a large part. It warps doors, rusts hardware, and causes framing members to rot away. While you're looking for problems, check to make sure that water is not building up around or dripping onto the door. If it is, find the source of the water and make the needed repairs at once.
Sagging Swing-Up With swing-up garage doors, sagging is the biggest problem. The reason: The lifting mechanisms usually aren't adequate to support the weight. If this is the problem, replace -- don't repair -- the mechanisms with extra-heavy-duty ones. Position them so the screws will be driven into new, solid wood.
Out of Alignment If the door rubs against the trim, move the molding back or adjust or shim out the track brackets; see Illustration 3.