Telling the difference between osb 2 and 3......
- Thread starter Screech20
- Start date
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No idea. Why do you need to know?
If it was your intention to fulfill a specification then chancing on low-end stuff like OSB is a wee bit risky.
Still better than chipboard though.
Still better than chipboard though.
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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.
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?
Proper class3 bond (wbp) plywood is significantly more moisture resistant than OSB, avoid cheap crap plywood though.
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?
Proper class3 bond (wbp) plywood is significantly more moisture resistant than OSB, avoid cheap crap plywood though.
List the codes, might make reference to bonding standards.
Generally speaking though if they mark it properly, they will mark it as OSB 2 or 3.
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