Why a Cavity Sliding Door Stops Closing Flush — East Tamaki Heights
By Rinat, Handyman Botany · 17 August 2026 · 2 min read
A cavity sliding door with its top sitting further out than its bottom, leaving a big gap when closed — leveled by adjusting the roller hinges through the top track, no replacement needed.
Why a Cavity Door Stops Sitting Flush
A cavity door hangs from rollers inside the top track, and each roller can be adjusted independently. If one side drifts out of adjustment — often just from years of normal use — the door stops hanging level: one edge sits further out of the frame than the other, and no amount of pushing closes the gap that's left.
What We Found at This East Tamaki Heights Property
The top of the door was sitting further out than the bottom, so the door was never fully level in its track. Even pushed all the way shut, it left a noticeable gap along the bottom edge.
The Fix: Into the Top Track, Then the Roller Key
The top track cover strip had to come off first to reach the mechanism — it sits tight against the ceiling and hides the rollers the door hangs from. With it off, the roller hinges were adjusted using the small hex key that's normally supplied with a new door, bringing the door level a fraction of a turn at a time.
The Result: Closing Flush, No Gap
The door now sits level in its track and closes flush against the jamb — the gap is gone, and the fix needed no replacement door, no new track, just the right adjustment in the right spot.
See every photo and the full breakdown on the full project page →
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