A garage door strut is a metal bar, usually steel, that runs horizontally across the back of a door panel, most often the top one, to keep it from bowing or sagging under its own weight and wind pressure. Struts are most important on wider doors, which flex more without one.
What a Strut Does
- Keeps a wide door from bowing under its own weight.
- Adds resistance against wind pushing on the door, which matters for garages that face open areas or storms.
- Helps the door track and open evenly instead of twisting.
Signs You May Need One, or a Replacement
- A top panel that visibly bows or flexes when the door is closed.
- Rust, dents, or a strut that has come loose from the panel.
- A wide door (most double-car doors) with no visible strut across the top section.
Installation and Sizing
The strut must match the door manufacturer's reinforcement schedule, fastening points and width. Added weight can change spring balance; a generic bar does not make a door wind-rated. We size and install struts as part of a repair or tune-up visit so the fit and attachment are correct the first time.
Maintenance
Check struts periodically for rust or loose screws, and mention any bowing or sagging panels the next time we're out for a repair or tune-up.
FAQ
Are garage door struts universal?
No. Length, profile and mounting pattern must match the door's design. Wind-rated reinforcement is specified for the complete door system; there is no general "insulated strut" upgrade.
How many struts does a garage door need?
It depends on the door's size and type. A single-car door may only need one; larger or heavier doors often need more than one panel reinforced.
Can I install a strut myself?
Have a technician confirm the reinforcement design, attachment points and added weight before installation, then check balance and opener reversal. Do not add a bar to a damaged section without finding the cause of the bowing.
If a panel on your door is bowing or you're not sure whether it needs a strut, call (916) 838-8182. We check struts and panel condition as part of repair and tune-up visits across the Sacramento area, with a $45 diagnostic trip fee. Garage door tune-up.
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