Bow, Rack or Twist? Three Different Ways a Fire Door Frame Can Move

Bow, Rack or Twist? Three Different Ways a Fire Door Frame Can Move Related diagnostic: Tighten One Frame Fixing and Watch the Door Gap Move explores the connected frame-movement or fixing pattern and helps compare the evidence before choosing a repair. "Frame moved" is only the beginning. Bow, rack and twist are different geometric changes, and they produce different evidence. What the pattern is telling you Sketch the pattern before intervening. Measure head, both jambs and bottom relationship, compare top/middle/bottom and use diagonal comparison where useful. Then map the fixing/support points. A single width measurement can miss racking or twist. For frame faults I would map effective restraint, not just visible screws. Check fixings, packers, substrate, the frame-to-wall junction and the opening itself. A frame can move locally, or the wall/partition can move with it. The door gap is the…