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    How much do you know about Masonry?

    What is the 'expansion joint' and why is it necessary on large floor surfaces?

    Answers

    A space filled with elastic material to allow materials to expand without breakingCorrect
    An invisible joint between two tiles
    Where do the ground wires connect?
    A placement error to avoid

    Without joints, the floor would end up 'lifting' or cracking due to changes in temperature.

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