"The Natural Philosopher" wrote in message
...

snip

I'd say its a win win in every sense except time and cost.

The thing to watch out for is not supporting the new joists at the ends
- you will lose a lot of strength if you don't. Typically they will end
up at a hip or gable end of the house, you will have to work out how to
support them there and still leave (in the case of a hip) ventilation.

Many thanks for that, I'll take a look at the feasibility of doing the cross
joisting.

Dave