How Should Temperature and Humidity Changes Be Investigated?

A fire door that works well in January and starts catching in August is telling you something. It does not automatically mean “the door needs trimming”. Find out whether the fault follows the weather The most useful clue is repeatability. Does the problem appear during damp weather? Does it disappear again later? Does the closing edge become tight while the head stays relatively unchanged? Does a seal suddenly feel much more resistant? Record the condition rather than relying on memory. Look at timber movement and the frame Timber can respond to changes in temperature and humidity. Check the leaf edge, lippings and frame for swelling, movement, splits or previous repairs. Then compare the door geometry. A changing gap can come from the frame moving relative to a rigid leaf, from an altered leaf, or from both interacting. Seals can expose…