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Carpets, Lino & Flooring
Is it correct procedure for a liquid dpm be used on top of self levelling compound?
Anonymous user 30 November 2017 - 7.01 AM
Hi, I had a kitchen extension built with a concrete floor approx 18 months ago. Self levelling compound was laid straight on top of the concrete floor (with no primer). The vinyl that was laid bubbled up, so contractor removed it. Tramex reading at the time of vinyl removal was 3-4+. A few months have passed since then and is now on average 2.6. Contractor wants to paint Sika Primer MD on top of the self leveling compound and place new vinyl straight on top (I presume when dry). Is this the correct way? Should the liquid dpm go underneath the self levelling compound (so that the slc can act as protection for it? I want it done the correct way, even if more time consuming, rather than a quick solution for the contractor. Thank you for any advice you have to offer.
3 answers from MyBuilder tradespeople
This can be one way of doing this. The self smoothing compound needs to be a moisture tolerant type. For many years this sandwich method was the preferred way of doing things but there are now many products which are able to be applied straight to the base prior to self smoothing compounds.
Answered
2 December 2017
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old compound needs to be removed from the slab by way of grinding. then a suitable moisture barrier needs to be applied, and then a smoothing compound (latex) on top
Answered
26 December 2017
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It really depends on what levelling compound was used, if it was ardex Na it would be fine to put a liquid dpm onto but not all compounds are the same. If you know which one it was you can as the manufacturer.
Answered
24 July 2020
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