Alexphd1

Under roof plyboard treatment

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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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It will stink when it gets warm for years ! why do you want to treat it...?? 

 

If its for anti condensation then you would want something acrylic based.

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Reason, quick Google on wbp ply and a few comments on not as good as it used to be and little water results in delaminating. I am probably over thinking this. 

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Please not creosote the smell will be awful can’t you find a better treatment if it needs to be done.

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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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Boards from TP wether that's a reputable supplier is s different matter!

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Is it stamped as certified WBP. ..?

 

Good exterior ply should be marked as BS so check first. 

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15 minutes ago, PeterW said:

Is it stamped as certified WBP. ..?

 

Good exterior ply should be marked as BS so check first. 

 

Yes just checked. 

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Came across this for plyboard. Pretty good guide

Screenshot_20180213-175346.png

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