What Causes Bottom Clearance to Change Over Time?

A fire door can be perfectly clear when it is installed and then start catching months or years later. That does not mean the door leaf has suddenly decided to grow legs and move itself. Something in the doorset or the building has changed. Look at what changed before changing the door Start with the history. Has the floor been replaced? Has a threshold been added? Have the hinges been replaced? Has the frame been repaired? Has the door been hit by trolleys or repeated traffic? Has the problem only appeared in hot, damp or very dry weather? These questions can move the investigation in the right direction very quickly. Hinge movement can reduce the bottom clearance If the hinge side has developed play, the leaf can sit differently in the opening. Look closely at the hinges and their fixings.…