On Jun 23, 6:43*pm, David in Normandy
wrote:
Someone has asked me to help put in an upper floor in a farm
outbuilding. The room dimensions are 7 metres by 5 metres constructed
with a single thickness of breeze blocks. He is planning having 7 metre
long joists and fixing down traditional tongue and groove floorboards on
top.

Is this feasible? 7 metres sounds like a very long span unsupported,
assuming that you can even get 7 metre long joists? I would have thought
that at least one cross beam would be needed for such a span.

I'm happy to lay floorboards and do the associated DIY but I'm no
structural engineer!

Suggestions?

--
David in Normandy. *
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Is there some earth-shattering reason for not laying the joists in the
5m direction?