Ceramic over Mastic not cracked

Discussion in 'Ceramic and Stone Q&A' started by Mike Antonetti, Sep 16, 2019.

  1. Interesting how this small entry area showed no signs of tile cracking with mastic instead of cementitious thinsets. With no crack suppression membrane the mastic cushioned the tile from cracking where the slab had cracks everywhere. Not sure if they used more mastic it would’ve held tighter therefor being so rigidly bonded that it would’ve caused tile to crack.

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  2. seamsealer

    seamsealer Pro Member

    Isn't that the reason for the membrane, if the cement floor moves or cracks, the tile won't? I thought the membrane was like a flexible underlay to take up the movement to save the tile.
  3. Yes, there’s many types of crack suppression membrane, this was void of any and the risk or unknowing that just troweled on mastic, stuck like hell in some spots and was too thin and didn’t hold well in other spots.

    I assume your travertine they used membrane for the control joints or the whole thing. Stone really doesn’t tolerate movement. Any more cracks since you moved in? 2? Years ago.
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  4. seamsealer

    seamsealer Pro Member

    Mike, it's been 3 years and we started the 4th year, man, time flies when you're having fun. LOL. Haven't seen any new cracks in our tile, but we keep our fingers crossed.
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