How to Apply Saltillo Tile to Cinder Block Walls

Prepare the cinderblock wall by applying a crack-suppression material: Roll on a thick layer of crack-suppression product with a paint roller. Immediately press in a layer of fiberglass mesh. Let dry.

Snap a chalk line vertically and horizontally, checking for level in both directions.

Mix up latex-modified thinset according to package directions. Spread a layer of thinset along the bottom foot of the wall and set the bottom row of tiles in place, using tile spacers to keep the tiles in place and define the grout lines. The minimum grout line recommended for Saltillo tile is ½ inch.

Continue laying tiles row by row above the bottom row, using the chalk lines as a reference to keep the tiles level, and using tile spacers. Saltillo tiles tend to vary slightly in size; adjust the grout spacing as needed to keep the tiles lined up. Allow the tile to dry and set at least overnight.

Mix sanded Saltillo grout according to package directions. This special grout includes larger sand particles than standard grouts in order to fill the larger grout spaces of Saltillo tile more satisfactorily without cracking. Firmly push into all grout spaces and remove excess with the grout float. Let sit for about half an hour and wipe with a wrung-out sponge to remove excess grout from the tile faces. Let the grout dry for a few hours and use a clean cloth to remove any residual grout haze.

Seal the tile and grout with a topcoat sealer intended for terracotta, unless you are installing presealed tiles. Oil-based sealers are recommended over water-based, especially for exterior applications, as they last longer. Let this dry completely.