Paul Giverin wrote:
In message , OG
writes
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?

Yep! I've got similar in my 1985 house.

One hopes so, as it leads to a substantially stiffer floor.

Did the chip get damp or what? Unusual to have it go...