Systems and Methods for Aligning Roll-Up Door Curtains

A door for selectively blocking and unblocking a doorway, wherein the doorway includes an upper end, a lower end, a first lateral edge and a second lateral edge, the door comprising:

• a roller to be proximate the upper end of the doorway, the roller to be horizontally elongate between a first end of the roller and a second end of the roller, the roller to be rotatable about an axis;
• a first track to be vertically elongate and proximate the first lateral edge;
• a second track to be vertically elongate and proximate the second lateral edge;
• a curtain to be attached to and wrapped around the roller, the curtain comprising a main section, a first edge section and a second edge section, the first edge section extending into the first track, the second edge section extending into the second track, and the main section extending between the first edge section and the second edge section, the curtain having an average material thickness in the main section and a point of greatest thickness in the first and second edge sections, the curtain to be movable selectively to a closed position to block the doorway and an open position to unblock the doorway;
• a first shim to overlie the main section of the curtain, the first shim to be closer to the roller than to the lower end of the doorway when the curtain is in the closed position, the first shim to be closer to the first track than to the second track;
• and
• a second shim to be spaced apart from the first shim and to overlie the main section of the curtain, the second shim to be closer to the second track than to the first track, the second shim to be closer to the roller than to the lower end of the doorway when the curtain is in the closed position, each of the first shim and the second shim having a shim thickness that is greater than the average material thickness, the shim thickness being of a magnitude that is closer to the point of greatest thickness than to the average material thickness.