quick question for the pros from a rookie CBU what does that stand for?

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bathroom rookie

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CBU what does that stand for?
I thought it stood for cement board, but the way some of you folks use CBU it has to stand for something else. Please tell me what it means. Thanks
 
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Jadnashua

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IE, a decoupling layer designed to be compatible with a tile installation. With few exceptions, I prefer newer, alternative materials (sheet membranes, whether user applied or in board format from the factory). Faster, neater, lighter to install. Actually waterPROOF, rather than water resistant (and stable).
 
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