sliding door track repair can be appropriate when the door sags, rubs, sticks or has uneven gaps around the opening. Separate running-surface damage from roller wear, frame movement or a threshold problem before selecting a repair path.
Signs: the door sags, rubs, sticks or has uneven gaps around the opening or the door closes poorly despite an otherwise sound visible opening. Causes: normal wear in hinges, latches or compatible mechanical hardware or local damage to an accessible component rather than an assumed structural defect.
The running rail may sit within a larger threshold assembly. This service does not alter structural openings, waterproofing or the building envelope. Explain any water-entry concern separately rather than treating a track repair as a diagnosis or remedy for it.
Show the points where movement catches as well as the full track. Local damage may have a different repair option from extensive wear. Photographs help describe the problem but cannot establish that the track, rather than the rollers or frame, is the only cause.
Keep the rail clear and check travel after the agreed work. Report recurrent catching so the remaining cause can be reviewed. Limits: Accessible non-structural running rails only. No threshold waterproofing alterations, drainage-system redesign, structural changes, major glazing or powered operators.