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I have some joints between drywall and drywall and also drywall and cementboard that will not be exposed because they are behind cabinets. Do I still need to tape them together? Does taping provide any structural function or is it just for the looks?

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Taping creates a fire barrier if there ever happened to be a fire in your wall a non taped joint could be a problem.

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  • But if no fire, no one can ever know whether it is taped or not
    – amphibient
    Dec 5, 2018 at 19:37
  • This is true but if is a big word for the disaster that could happen.
    – Ed Beal
    Dec 5, 2018 at 19:40
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    Taping also blocks roaches and other insects.
    – Jim Stewart
    Dec 5, 2018 at 20:03
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Taping provides a moisture barrier and an insect barrier. Sure, no one would know...until some event brings it to their attention.

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