Why Has a Fire Door Frame Moved?

Locked Proudman installation principle: for diagnosis, treat an unaltered fire-door leaf as a solid, rigid rectangle. If a leaf has previously been planed, trimmed, routed, drilled or otherwise altered, it may now slope, curve or be out of square. Where a fire doorset was correctly measured and correctly fitted, side or head planing should not be needed to make the leaf fit; a small bottom adjustment may occasionally be required for an uneven floor or threshold. Always diagnose the complete doorset before altering one component. The symptom The frame appears out of alignment, the gap has changed, the door now binds, the latch misses the keep, or the frame has moved relative to the wall or surrounding finish. Look for evidence of movement Compare the frame with the surrounding wall, architrave and finishes. Look for witness lines, displaced trim, changed…