Dry screed.

Discussion in 'Builders' Talk' started by Westforester, Dec 6, 2017.

  1. Westforester

    Westforester Member

    We have a thin, dry, sand/cement screed just been layed ontop of our slab (within an extension).

    I cant find anywhere that talks of drying time for 'dry screed' mixes - only a 1mm a day for standard screeding.

    Its only a leveler really, will be covered by Kingspan board, then DPM then flaoting chip floor, then Karndean.

    Has anyone got an experience on this? Im sure its 'gone off' already - surely it cant take long to dry (it was just' holding a ball' consistencey.

    AND- what would happen if I inadvertently trapped some moisture in there (ie between the slab and Kingspan/DPM sandwich)?

    Thanks for any experiance
  2. KIAB

    KIAB Well-Known Member

    Thickness &is it bonded or unbonded screed.
  3. Westforester

    Westforester Member

    unbonded - 25mm tops.

    Its been used as a 'filler' rather than a screed really, becasue the slab was too wonkey to take the kingspan.
  4. KIAB

    KIAB Well-Known Member

    Your looking at a month minimum, this time of the year may be a bit longer, if you use heat to speed up drying, there is a risk of shrinkage,& screed lifting.
    Ideally you need to let it dry throughly & not trap in any moisture as it rises to the surface & evaporation.
  5. Westforester

    Westforester Member


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