What Do Fire Door Rubbing Marks Tell You?

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 A door may feel as though it is rubbing, but the most useful evidence is often visible on the door or frame. Look for paint transfer, stains, rubbed lacquer, exposed surfaces, polished contact areas or other witness marks. These tell you where contact has actually occurred. A mark tells you where, not automatically…