A failing commercial overhead door strut typically produces a sharp, metallic creak or pop during movement, often followed by a grinding or scraping noise as the door travels. This sound usually originates from the strut’s attachment points or internal wear within the strut tube itself, indicating metal-on-metal contact or loss of structural integrity. The noise is most noticeable during the door’s transition from horizontal to vertical travel, especially when the door is under load or moving slowly. Ignoring these sounds risks sudden strut failure, which can cause the door to sag, bind, or drop unexpectedly—creating a serious safety hazard in high-traffic industrial or warehouse environments.
How Overhead Door Struts Function
Commercial overhead door struts are rigid steel tubes mounted vertically on either side of the door panel, designed to prevent lateral bending or twisting of the door sections during operation. They transfer wind load and operational stress from the door face to the vertical tracks and building structure. Unlike springs or cables, struts don’t store energy—they resist deformation. When intact, they move silently within their brackets, maintaining door alignment. Over time, vibration, impact, or corrosion can wear the strut’s ends or distort the tube, compromising its ability to hold the door rigid.
Common Sounds of a Failing Strut
The earliest audible sign is often a high-pitched creak or squeak when the door starts moving, caused by dry or corroded bushings where the strut meets the bracket. As wear progresses, this evolves into a loud pop or clunk—indicating the strut has shifted or bent slightly, allowing sudden metal contact. In advanced stages, a continuous grinding or scraping noise occurs as the deformed strut rubs against the track, roller, or adjacent hardware. This sound is rhythmic, repeating with each door cycle, and may vary with temperature changes as metal expands or contracts. Unlike spring or cable noises (which are often sudden and violent), strut failures tend to be progressive and increasingly loud.
What Causes Strut Failure
Struts fail due to fatigue from repeated flexing, especially in doors exposed to high wind pressure or frequent cycling. Corrosion from moisture, salt, or chemical exposure weakens the steel, particularly at welds or bolt holes. Physical impact from forklifts, pallets, or equipment can dent or bend the strut, creating stress points. Improper installation—such as over-tightened bolts or misaligned brackets—adds uneven load. In rare cases, manufacturing defects in the steel or welds lead to premature cracking. Doors in coastal or industrial areas of Metro Vancouver are especially vulnerable due to environmental exposure.
What You Can Safely Check Yourself
Facility staff can inspect struts visually and aurally without disassembly. Look for visible dents, bends, or rust along the strut tube, especially near the top and bottom brackets. Listen for the described noises during slow, manual operation—disconnect the opener if safe to do so. Check that bolts at both ends are present and snug (but do not over-tighten). Verify the strut sits square in its brackets with no gaps or tilting. If the door appears uneven, sags in the middle, or rubs against the track, the strut may be compromised. Never attempt to straighten a bent strut—it’s weakened and may fail catastrophically.
When to Call a Professional
Any sign of bending, cracking, or persistent noise after lubrication and bolt check requires professional replacement. Struts are under no spring tension, so removal is relatively safe, but correct sizing and installation are critical. A replacement must match the original length, diameter, end fitting type, and load rating. Using an undersized or incorrect strut risks door instability or track damage. Professionals also inspect related hardware—brackets, rollers, and tracks—for secondary damage caused by the failing strut. In high-cycle or high-wind areas, upgrading to a heavier-gauge strut may be recommended.
Frequently Asked Questions
### Can I lubricate a noisy strut to fix it?
Lubricating the bushings or contact points may temporarily reduce squeaks from dry friction, but it won’t correct a bent, cracked, or corroded strut. If the noise returns quickly or is accompanied by grinding, the strut is structurally compromised and needs replacement.
How long do commercial door struts typically last?
Lifespan varies widely based on use, environment, and maintenance—typically 5 to 15 years. Doors in high-cycle facilities or harsh climates may see strut failure sooner, while protected, low-use doors can exceed this range. Regular inspection is the best predictor of remaining life.
Is a failing strut dangerous if the door still opens and closes?
Yes. A weakened strut can fail suddenly during operation, causing the door to lose rigidity, bind in the track, or drop unevenly. This creates pinch points, risks damage to the door or equipment, and poses a safety hazard to personnel nearby. Address noise or visual defects promptly.
CCGDS (604) 206-5727
