When cement board meets a block is expanding metal sufficient to put over the joint to stop it cracking before I scratch coat?

And do I need to put scrim on the joints of the cement board as well as expanding metal?

  • 1
    Meets a block of what, exactly? – FreeMan Feb 2 at 12:41
  • picture please. – Ted Mittelstaedt Feb 2 at 15:10

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