Thanks.I thought I posted this but apparently I didn't -
https://www.ukworkshop.co.uk/threads/feasability.147296/post-1727944
I'd trust OSB over modern ply (unless an expensive true marine grade) any day for durability - much higher glue content and the way it is made means it is more impregnated not just sitting between layers.I’d personally not use osb externally unless I had no choice for whatever reason. I can only imagine that the quality of osb years ago mentioned by @SammyQ was vastly different from today’s standards. Even the ply they use to fence off building sights and empty buildings does last long .
I was aware of different grades but didn’t know about the glue content, I’m not a osb fan but hear what you say . Agree about most plywood though..Yes, I mean OSB3. Haven't come across 2 for a long time, but not looking for it. I guess there must be a OSB1 as well, never seen that.
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