When a commercial door starts dragging along the floor or scraping the bottom corner, most people assume it’s swelling. It’s almost never that, with one rare exception covered at the end.
The door panel rarely swells. What shifts is the hardware that supports it. Hinges and pivots connect it to the frame. The threshold attaches to the floor and can affect how the door operates.
Why is my commercial door dragging on the floor?
Here’s what’s actually going on in most cases:
The threshold has shifted
Over time, the screws holding the threshold down can back out, strip, or break. That lets the whole threshold flare up or tilt just enough for the door to catch on it. Depending on how long it’s gone unaddressed, you’ll find wear marks or bright metal where the door rubs.
The pivots have worn down
Pivots are what the door actually hangs and rotates on. As they wear, the door drops lower in the frame than it was built to sit. Drop far enough, and it starts rubbing on the floor or threshold.
The hinges are bent or broken
This usually comes from impact. Equipment or a cart hits the door, or someone swings it open too far. Once a hinge bends, the door no longer hangs true. You’ll see it in the gaps between the door and frame.
How do you fix a dragging commercial door?
The good news: most of these are straightforward fixes. Worn pivots and bent hinges usually just need replacing. A loose threshold often just needs new anchors and screws to pull it snug to the floor again. Sometimes that means longer screws, so they bite into solid material.
Should you trim the bottom of the door?
The one thing we’d caution against: don’t assume the fix is trimming material off the bottom of the door. Cutting a door panel should always be a last resort. Once it’s cut, you can’t put the material back. In almost every case, the real problem is the hardware, not the panel itself.
What else can cause a commercial door to drag?
A few other things are worth ruling out:
- Glazing screws that need adjustment
- A wood door that’s delaminating
- A wall that’s no longer structurally secure
- Wood that’s deteriorated until it won’t hold a screw, which means it won’t hold the door in position either
Can a commercial door actually swell?
The rare exception: in extreme cases, wood doors exposed to a lot of water can swell. Most are laminated to resist exactly this. If the door has genuinely swelled, fix the water source first, before you think about replacing it.
