In article ,
ARW wrote:
I wouldn't like to count on that if its a timber framed building.
The external one would at least have a fire proof layer between it and
the frame even if its only plaster board.
It would also set off the smoke alarm well before the fire took hold.


Timber framed buildings should use intumescent steel back boxes.

Interesting. Mate has a timber framed house bought new which I've done
some work on, and the boxes there are all ordinary ones. Usually nailed to
a stud with clouts.

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*Frustration is trying to find your glasses without your glasses.

Dave Plowman London SW
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