Short answer: Multi-slide door installation is a sequence of building and fitting decisions, not the final step after the product arrives. The opening, track support, panel order, sill, drainage, glass handling and finish interfaces must be coordinated before the installer starts.
Confirm the finished width and height, level, plumb, square, structural support and the condition of the floor and head. Record the finished floor height and the space needed for the track, trim and drainage. If the opening is out of tolerance, decide who corrects it before the frame is delivered.
Keep the approved shop drawing on site. It should show the panel order, handing, track sections, fixing points, sill detail, drainage path and the relationship to the surrounding wall, deck or interior finish.
Large glass panels need a handling plan that protects edges, finishes and people. Keep the route clear and do not store panels where moisture, grit or other trades can damage them.
Ask whether the price includes survey, structural preparation, delivery, lifting equipment, trim, sealant, final adjustment and removal of packaging. A price comparison is only useful when the installation boundary is the same.
Record defects with photographs, location and date before handover. Keep the final drawing, glass reference, hardware list and care sheet together so later service work follows the approved configuration.
The installer should explain which adjustments are normal after the first operation and which conditions require a return visit. Record the final panel order, handle position and any protection left on the track. A clear handover prevents a later maintenance issue from being confused with a design change.
Keep an installation checklist with the delivery record. It should name the opening tolerance, lifting route, track protection, panel sequence, lock check and final photographs. If a problem appears later, those records show whether the cause was the opening, installation, adjustment or a later change in the room.
Only when the required levels and interfaces are controlled. The release dimension should be checked against the finished floor and the approved sill detail.
Possible causes include track contamination, frame movement, incorrect adjustment, an out-of-square opening or a damaged roller. Check the complete installation before replacing hardware.
After the frame, panels, surrounding finishes and threshold are complete, with the door operated repeatedly in its normal sequence.