Thinset coverage behind a backsplash tile

Behind the tile, combed thinset ridges must collapse into a near-full bed with no voids: aim for ≥80% mortar coverage on interior walls and ≥95% in wet or exterior areas, verify by pulling a tile and reading the footprint, and back-butter large or glass tile to get there.

What this diagram shows

A two-part detail of thinset mortar coverage behind tile. On the left, a side section shows notched thinset ridges on the substrate that flatten into a near-full bed as a tile is pressed down, leaving no voids. On the right, the back of a pulled tile is shown as a grid where most cells are covered with mortar and a few corner cells are empty voids, illustrating roughly 86% coverage against the target of at least 80% for interior and at least 95% for wet or exterior areas; large or glass tile is back-buttered to reach it.

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<figure style="margin:0;max-width:800px">
  <a href="https://remodelcalculators.com/construction-diagrams/backsplash-thinset-coverage" target="_blank" rel="noopener">
    <img src="https://remodelcalculators.com/illustrations/backsplash-thinset-coverage.svg" alt="A two-part detail of thinset mortar coverage behind tile. On the left, a side section shows notched thinset ridges on the substrate that flatten into a near-full bed as a tile is pressed down, leaving no voids. On the right, the back of a pulled tile is shown as a grid where most cells are covered with mortar and a few corner cells are empty voids, illustrating roughly 86% coverage against the target of at least 80% for interior and at least 95% for wet or exterior areas; large or glass tile is back-buttered to reach it." width="800" height="500" style="width:100%;height:auto;border:0" loading="lazy">
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    Diagram: <a href="https://remodelcalculators.com/construction-diagrams/backsplash-thinset-coverage" target="_blank" rel="noopener">Thinset coverage behind a backsplash tile</a> — courtesy of <a href="https://remodelcalculators.com" target="_blank" rel="noopener">RemodelCalculators.com</a>
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</figure>

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