Gaffar wrote:

The question I have is I have bought 22mm 2400x600 flooring grade
chipboard - green backed stuff-
(without thinking) and am now not sure if these boards will be too heavy
for the joists to handle

Joist spans are about 6.5 feet each with 0.5 foot overlap between the 2
approx 12 feet in total

no worry then - im assuming its supported at the 6.5 ft place. If you
mean 12ft between supports, I wouldnt put much up there at all, but a
few boxes are no biggie.


NT