Shed floor - 11 or 18mm OSB3

[Tim Watts]

I'm overlining my shed floor with 50mm celotex and some sheet material.

OSB3 seems cost effective and I know it will not mind a bit of damp or spilled water.

So, on top of well supported celotex - 11mm or 18mm?

The shed will have heavy stuff stored, but spread out - no massive high point loads like machinery...

[meow2222]

ISTR 11mm not being any cheaper in OSB3. 11 should be fine though if you've already got support in place.

I dont know anything about this shed, but with most sheds insulating the floor makes temp swings worse.

NT

[Clive George]

Instinctively 18mm. 11 may well be fine, but 18mm will be that much more sturdy and reassuring.

[The Medway Handyman]

Looking at Wickes prices 18mm is about £4 a sheet more than 11mm.

Is it worth mucking about to save very little?

[dennis]

shuttering ply.

[meow2222]

18mm would be fine with no floor under it, just bearers. This shed has a fu lly supported floor already. I don't think there'd be any mucking about inv olved. Spend the few quid on something where it makes a difference.

NT

[Tim Watts]

Thanks for all the opinions :)

[meow2222]

Look online to get them cheaper - I cant remember who it was, but they were much less than the usual BMs, with 11&18mm coming in at more or less the s ame price.

NT