How To Waterproof MGO Board (Magnesium Oxide Board)

It's one of the most common substrates waterproofers are faced with, but what is the best approach to take when waterproofing over MGO board (Magnesium Oxide Board).
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[@michaeld954]

I was thinking of building a adu with steel framing and mgo board and rockwool insulation no wood building can mgo be used for the outside

[@GripsetIndustriesPTYLtd]

Hi Michael, thanks for watching! Always refer to the MgO sheet manufacturer for confirmation on the product's suitability for use in different applications.

[@ralphconnolly5195]

MgO board has a water uptake of only 4 per cent which means it is already waterproof

[@ubacow7109]

does MGO board crack w/ nails or screws?

[@GripsetIndustriesPTYLtd]

Hi William, you would need to check with the manufacturing specification.

[@newtonenergy768]

Easy NO