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Mortar is used between bricks, cinder blocks, or stone to bind them and fill any gaps. It is made from sand, a binding agent (cement or lime), and water.

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Must I remove all mortar between tiles before grouting?

Do I need to be worried about scraping down the hardened mortar so that the joints can be completely filled with grout or are they talking about simply removing any loose mortar? … Although none of my joints have mortar that rises above the grout, many of the tiles have some sections where the mortar is higher than others. …
Andrew Flanagan's user avatar