I want to floor some of the loft, just for a bit of storage. Looking for about 40 sq. m. Wickes' Tongued and Grooved Chipboard Flooring looks OK, but says: "Suitable for all domestic flooring and for joist widths up to 450mm centres" My joists are a bit variable, from 420mm up to about 500mm, so would the excess distance cause a problem?
atm, there are a few bits of 18mm OSB about 30cm width and they seem solid over 500mm; I'd use OSB but it's a lot more expensive.