Self levelling layed over water underfloor heating small cracks big noises

Discussion in 'Tilers' Talk' started by James Brown G, Feb 26, 2020.

  1. James Brown G

    James Brown G New Member

    Hi guys I had an underfloor heating system installed it's a mat based system ontop of concrete sub base and water pipes .
    Then 2 part self levelling compound on top
    Been down 6 weeks about 12 mm on top of matting
    Looks solid but now a few hairline cracks appeared and every few hours I can hear a cracking noise
    I'm guessing this is from the self levelling compound
    Inna few areas it does sound hollow if knocked on so we dug an area up to see if it was bonded to the matting it seemed to be bonded well.
    So any ideas in terms of should we be ok if put a decoupling membrane on top to tile it
    Will the hairline cracks and noises stop over time ?
    Many thanks for help
    Doc James

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