Commercial Sectional Door Repair: getting ready

Cold weather has exposed a widening gap below the closed door. The bottom retainer is bent, the rubber seal is split, and uneven seating lets drafts and slush enter the work area.

Worth answering before the call

Do you have the model, serial number and service record? Is the track standard, high-lift or vertical-lift? Where during travel does the sound or hesitation occur?

Why are the hinges numbered along the sides?

Numbered end hinges position each roller progressively farther from the panel as the sections rise. That changing offset lets the stacked door follow the track curve while maintaining its shape. Installing a hinge in the wrong position can alter alignment and clearance. Centre hinges have a different role: they connect sections across the width without carrying track rollers.

Can bent track be straightened or must it be replaced?

That depends on the location and degree of deformation. A minor change in an accessible straight section may be corrected while restoring spacing and support. A sharply creased rail, damaged curve, opened seam or track that can no longer hold the roller securely usually calls for a compatible replacement. Brackets, anchors and adjoining track are checked either way.