Robert Laws wrote:
xxx

Just to clarify; I want to build in sympathy with the rest of the
house. This means no T+G (and no chipboard of course). It means
using boards similar to the ones I already have even though better
quality ones might be available.


Why not tongue and groove?
The difference wont show,
but if the wood does expand or contract there wont be so many draughts.
Or does the secret nailing stop the groove being an expansion joint?

http://wiki.diyfaq.org.uk/index.php?...n_a_Wood_Floor



And on this subject when improving victorian floors
is it a good idea to put kingspan under them to insulate them
and should we put a plastic vapour barrier on top of the kingspan
or would that trap any spills of water in the house
and cause more rot than the condensations it's supposed to stop?

[g]