visionset wrote:
"dennis@home" wrote in message
.uk...

http://www.astd60.dsl.pipex.com/UnderFloor.jpg

Difficult to judge the scale but that looks like a heck of a deep void.
Mine are only 4". I suppose it is dependent on the spans, my max is
~11ft in a 1930's house.

Are you sure its a house and not a bungalow that someone has converted the
attic?
4" is not deep enough for floor joists over 11' imho

Well 70 odd years must say something, that and the other identical 100 odd
houses built the same way.
Obviously building standards have come on some but I'd say it was adequate.
The one real design flaw is the cold bridge concrete sills downstairs.

4x2 over 11ft is workable, though only just. Just dont ever get a piano
or waterbed in there! And dont do jumping exercises. Should never have
been built that light, but there ya go. For all we know the 2x4 may
have been stiffened a bit by noggins.


NT