In article ,
OG wrote:
I've just had to cut out and replace a section of chipboard type
floorboarding that had started cracking up and pulling away the T&G (for
some reason the join line was not ON the joists, but just off them. On
cutting out the failing section I found that the floorjoists had a
crossed couple of battens between them.
http://www.astd60.dsl.pipex.com/UnderFloor.jpg

Is this typical for upstairs in a 1980's house?

Typical full stop. They're called twisters. They help prevent the joists
warping.

--
*Don't sweat the petty things and don't pet the sweaty things.

Dave Plowman London SW
To e-mail, change noise into sound.