Why Is My Grout Cracking? (Movement, Water, and Wrong Product)
Structural movement and deflection
Water intrusion and freeze-thaw
Grout vs caulk at changes of plane
Materials for a crack that stays closed
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MAPEI Ultracolor Plus FA Powder Grout, 10 lb (Eggshell)
Cracked sanded grout in a shower floor often means the wrong grout type or a too-thin joint — Ultracolor Plus FA is formulated for narrow joints and resists shrinkage cracking on re-grout repairs.
Aqua Mix Sealers Choice Gold, Quart
Porous cement grout wicks water, swells, and cracks through freeze-thaw or seasonal movement — sealing after cure cuts water ingress that keeps reopening hairline cracks.
DAP Alex Plus Acrylic Latex Caulk, White, 10.1 oz
Change-of-plane joints (wall-to-tub, wall-to-counter) must be caulked, not grouted — flexible acrylic latex absorbs movement so the rigid grout beside it does not keep cracking.
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Related reading
Measuring the job: how much tile do I need, how to estimate grout and thinset. Lippage context (sister site): what is lippage in tile.