The exact square footage coverage provided by one quart of pre-mixed grout varies considerably depending on the dimensions and thickness of the tiles as well as the width and depth of the joint lines. Generally, one quart of standard pre-mixed acrylic or urethane grout will cover approximately twenty to forty square feet of standard-sized subway or ceramic tiles with normal one-eighth-inch joint spacing. However, if you are installing very small mosaic tiles, which feature a drastically higher concentration of grout lines per square foot, a single quart will cover a much smaller area, making it vital to calculate total linear footage of joints rather than just surface area before purchasing materials.
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