Keep a damp sponge nearby for quick cleanup in case mortar is dropped on the tiles or any other surfaces.Mortar should also cover the entire back of the tile without voids or trowel lines. All of the ridges should be collapsed without voids or trowel lines. Check several of the set tiles for adequate mortar coverage by lifting them up.Firmly apply pressure to the face of the tile while moving the tile back and forth perpendicular to the trowel ridges this helps to ensure that the mortar transfers to the back of the tile and that the tile is in an even plane with adjacent tiles. Building upward, row by row, continue to place the field tiles and decorative accent tiles in position on the substrate.Allow the area to dry until the mortar achieves its initial cure and the tile becomes solidly bonded. Use spacers to maintain a consistent gap. Set your bottom row of tile, leaving a gap between the countertop.Note: If using mesh-backed mosaic tile sheets, skip Step 5 and go to Step 6. Only spread as much mortar as can be covered with tiles before the mortar skins over or loses transfer when touched.Back-buttering these shapes can cause cracking. Note: Do not back-butter ceramic tile with curved surfaces such as chair rails and rounded, decorative listellos. If tiles larger than 15″ (38 cm) are used on any side, back-butter tiles before setting them to provide uniform mortar coverage and maximum support. Follow immediately with more mortar and “comb” the mortar in one direction, using the notched side of the trowel to achieve an even-setting bed. First, using the straight (flat) side of the trowel, apply a thin, even coat to the surface.Using a notched trowel, spread mortar while holding the trowel at a 45-degree angle to the wall.Contact MAPEI’s Technical Services Department for guidance if needed. Select a notched trowel size that is appropriate for the size of the tile.Refer to current Technical Data Sheets on our product pages for detailed instructions. Mix the mortar according to the instructions on the package. Carefully adjust the tiles to create a joint space that is slightly wider than the pre-set spacing in the sheet until the tile fills the space evenly and lines up with the boundary, outer edge or border line. Dry-fit the individual mosaic tiles by hand-spacing.When the trimmed sheet does not match up perfectly with the boundary, outer edge or border line, remove 3 to 5 rows of tile from the sheet.Using scissors, trim the mosaic tile sheets to fit the installation.Note: If you are using small mosaic tile (1″ or less), and you prefer not to cut the tile, it is acceptable to hand-space some of the tiles to avoid cuts. Dry-fit all field tiles as well as border and decorative accent tiles.Dry-fit a row of tiles (or mosaic tile sheets) by placing the tiles (or sheets) in position with spacers along reference lines to check for accuracy and determine tile cuts.
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