Limestone flooring is available in various finishes, from smooth to a rough natural stone look. Since limestone is relatively soft, prevent edges from chipping by separating the limestone tiles with a grout line. Prepare concrete sub-floors by removing all debris and paint overspray and then leveling the floor with a self-leveling compound. Install a layer of concrete backer-board over wood sub-floors to prevent sagging and moisture encroachment. Choose tiles sized to fit against the longest wall so that the cut tiles at each end are at least half the width of a finished tile.
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