Hi all, back once again to the knowledge collective for some sound advice.

Had a good hunt around online but couldn't find a figure for the Maximum allowable gap between the front FACE of the fire door (flat entrance door, FD30) and the door stops.

Just to give a little background on it, we're upgrading existing nominal/notional doors with strips, hinges, correct gaps etc and some of our original rebated frames have had some slight movement/twisting over the years as they've seasoned meaning that there are some minor gaps at different places along the frames (anything up to 2mm in places and typically towards the bottom of the frame legs) between the face of the door and the rebated door stops (all doors are inward opening to the flats and are within the 2-4mm gap between door edges and frame).

Logic would suggest that as we've got intumescent smoke strips fitted into the door the gap, theoretically, shouldn't pose an issue but it would be great if someone could highlight the official guidance on it.

As usual thanks in advance to everyone, Richard

The issue is not so much that the door leaf is not a close fit to the door frame rebate stop. Rather, is the door leaf thickness wholly contained within the door frame rebate or does it stand proud on the 'pull-side'?

Some doors have no stated tolerance within their certification document for this issue, others have up to 1mm generally.

Thanks Neil, explained perfectly (as usual)