I have started to remodel an upstairs bathroom (23 year old house) and find that I have an OSB sub-floor. It is not very level so would like to level it with some cement like stuff before putting down the backer board.
Everything that I have been told by the DIY store is contradicted by the lables on the stuff that they sold me. It all says "Not suitable for OSB or porous surfaces".
Is there anything that I can use before installing the backer?
I have just visited an online site showing how to do a bathroom and they just go ahead and slap all the wet stuff on the OSB.
Who is correct?
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