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Under roof plyboard treatment


Alexphd1

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Just looking for a 2nd opinion. We are planning to treat the 18mm wbp plyboard with creosote. Any other paints oil would be a better option? The plyboard will have a 2 inch ventilated gap under and breathable felt with standing seem stainless steel roof above. 

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Proper BS STD ply is water and boil proof and will stand a lot of moisture before it delaminates. For something that’s going to be there for decades I’d suggest you go for a decent and stamped / approved board from a reputable supplier. 

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