Is it good to have more than one strut on a garage door?

Strut: A solid one piece of molded sheet metal cut to the same length as the width of your garage door. This reinforcement at the top of your door is there to keep the opener arm that attaches to the top panel of the door from bending top panel when opener pulls on panel to open door. Any garage door with an opener that has an arm and pulls door open from the top panel has to have some kind of strut to protect top panel from damage, no matter how wide the door.

garage door strut

Strut on every panel

When you have a garage door that is over 16 ft. wide than you should have a strut on every panel. This is necessary because when a door panel is longer than 16ft. wide it will sag or be concave when the door is in the up position. Struts eliminate this from happening when the door is up. When a garage door is constructed of wood it is even more necessary to have multiple struts even on smaller garage doors 8-10 ft. wide. If you have a custom carriage door made of all wood or metal panels on the inside and wood overlay on the outside it is also necessary to have sometimes 2 struts on each panel. Steel and wood combination doors really sag a lot when in up position because of the extra weight of the wood on outside of the garage door.

All wood garage door?

When the garage door is constructed of all wood than a strut is necessary for every panel on the door. Wood doors do not have the rigidity of steel door panels. Also wood will be more affected by weather than steel doors. Even with all the struts wood doors require they will over time sag and warp from mostly rain water over the years.