Most fitters round here use osb myself included for replacement flat roofs but after reading through a few posts I'm not sure whether there are better products to use
I have seen 12 & 18mm shuttering ply used too.
Thanks in advance.
There are a number of differences between OSB 2 and 3.
One difference you could test for is swell thickness, OSB 2 will swell more when exposed to wetting, of the top of my head I think it is 20% vs 10-15%.
Practically speaking this isnt a great test (we are talking factions of mm's), other properties that can be tested for more reliably can really only be done in lab conditions.
OSB is normally stamped with its class, I find it odd you have sheets with no markings?
Most fitters round here use osb myself included for replacement flat roofs but after reading through a few posts I'm not sure whether there are better products to use
I have seen 12 & 18mm shuttering ply used too.
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