Using OSB for flooring ... ?

Question

I've seen conflicting information about whether 18mm OSB can be used for flooring in dry areas. Having removed some "back" (servants!) stairs I've got a hole, between the ground and first floor, to close-up that's about 1300 x 1500. I also have some pieces of 18mm OSB that are looking for a use (although I'll have to pack it with some 4mm ply to match the existing floor). What does the team think?

tabbypurr · Accepted Answer

why would it not be suitable? NT

David · Answer

Front room is done in OSB by choice. Nice wooden look with random pattern.  If you ever get bored, lino or carpet on top. Cheers Dave R

fred · Answer

Thanks to one and  all for all the suggestions. I'll try the model shop approach first and of that doesn't work I'll make one out of hard plastic. Tufnol as someone suggested.

nothanks · Answer

I was wondering how whether it might degrade with repeated deflection as  people walk over it.

tabbypurr · Answer

OSB is basically a version of ply. NT

newshound · Answer

Yes but a bit more dependent on the glue. I'd have the same reservations  as the poster above. Answer might depend on whether the space is walked  on all the time, or only once in a blue moon.

tabbypurr · Answer

both are entirely dependant on the glue. And they work fine. NT

Tim Watts · Answer

Irrespective of the OSB, that span is too big.

You need to hang some mini joists to close the gaps down to around 400mm.

Pick the 2 sides that have the best load bearing joists visible, then use joist hangers to hang some mini joists in between. 6x2 should be more than enough to span 1.5m with loads of margin.

nothanks · Answer

Thanks, but I was aware of that. There will be 8x2 joists (the existing  joists are a mix of 8x2 and 8x3) on 400mm centres.

Using OSB for flooring ... ?

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