High-lift conversion

Check how much high lift the room allows, then get the drum, turns, cable length, and spring sizing for the conversion.

Room & door

Floor-to-ceiling height (in)

Door height (in)

Headroom allowance above track (in)

Space for the shaft, drums, and track radius above the raised horizontal track. 12" is the standard rule of thumb.

References & standards

Turns = (door height + lift) / drum circumference + 1 (SSC Spring Engineering convention)
ANSI/DASMA 110: Standard for Lifting Cables for Sectional Type Doors
DASMA TDS 160: Sectional Garage Door Terminology

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