Long term this - but while I'm up in the roof pulling wires, I started
thinking...

I want to reboard the dormer with *non T&G* (for easy lifting) normal
floorboards. No ply, no chipboard, nothing that's a PITA to lift for access
to cables.

My joist spans a

400mm in the roof voids (light boarding here for storage, direct onto
ceiling rafters, 4x2").

500mm on most of the strengthened parts of the main floor (8x2" and a few
4x2" packed up - yes I know...)

600mm span in *one* place.

The 600mm span might get an extra joist in there, or at least the 4x2"
packed up.

So how do you decide what thickness of 6" or 8" floorboard can cope with 400
and 500mm spans for both light storage and normal flooring? I'm thinking
of "normal" floorboards or maybe something reclaimed. All will be screwed
down. But if I have to go thicker, that's fine.

We have to assume normal usage (eg maybe a bed) but we will probably have
our lounge up there. Pianos unlikely.

Cheers

Tim

--
Tim Watts

This space intentionally left blank...