Have the details ready
Identify the affected opening and describe the symptom. Gather available product labels and previous work records. Explain access restrictions and keep the opening clear.
Identify the source of resistance
Describe where the sliding panel catches and whether the problem changes during travel. Ask how the assessment distinguishes worn rollers, a damaged track, panel alignment and threshold damage before selecting parts.
Compare compatible parts and retained materials
Ask which roller assembly matches the panel and its weight, whether the track can be repaired or needs a replacement surface, and what work is proposed for the threshold. Clarify panel removal, access and which frame sections remain in place.
Confirm movement, drainage and closing checks
Ask how the completed work will be checked for smooth travel, panel height, interlock and lock alignment. If sill drains or the threshold are involved, confirm how they will be assessed and what drainage work is included. Keep the component details and any remaining limitations with the agreed scope.
Keep a record
Keep the agreed scope, itemized invoice and documented findings together for any future visit.
Useful references
ENERGY STAR window, door and skylight information ↗NFRC performance labels ↗General guidance. Confirm the scope for your property.