On Sat, 15 Mar 2008 18:51:20 +0000 John Rumm wrote :
If my understanding is correct, you ought to be able to keep all the
existing frames and architraves etc, and just replace the door stops
with deeper ones (25mm).

Do you need to do that if you put intumescent strips in the door?

I am well out of date on this stuff, but in my BCO days you could keep
panelled doors if they were stripped and then painted with Nullifire
intumescent paint. Not cheap in materials or time so it was hardly
ever done. For older houses the favoured approach was standard flush
fire doors with planted mouldings to make dummy panels.

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk