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Tanking and Screed

  • 29-08-2018 9:11pm
    #1
    TiNcAn
    Registered Users, Registered Users 2 Posts: 154 ✭✭


    I took up tiles and grout in an old kitchen extension to reveal an old damp concrete floor which a tanking slurry was previously applied to.
    My aim would be to put down laminate but the subfloor obviously does not have a DPC and is quite rough and uneven (up to ~25mm). To deal with this I would like to apply a tanking slurry and then lay a self leveling compund.
    I am getting in touch with some manufacturers whether they have a combination of products that would be suitable for this purpose. I asked my builder if he could quote for this job but am considering doing it by myself.
    Does anybody have any advice on a tanking slurry and leveling compound that would be suitable for this purpose? Or suggest a different approach?


Comments

  • #2
    Safehands
    Registered Users, Registered Users 2 Posts: 1,360 ✭✭✭Safehands


    TiNcAn wrote: »
    I took up tiles and grout in an old kitchen extension to reveal an old damp concrete floor which a tanking slurry was previously applied to.
    My aim would be to put down laminate but the subfloor obviously does not have a DPC and is quite rough and uneven (up to ~25mm). To deal with this I would like to apply a tanking slurry and then lay a self leveling compund.
    I am getting in touch with some manufacturers whether they have a combination of products that would be suitable for this purpose. I asked my builder if he could quote for this job but am considering doing it by myself.
    Does anybody have any advice on a tanking slurry and leveling compound that would be suitable for this purpose? Or suggest a different approach?

    How do you know it is damp? Is damp visible or do you just think it is damp? There are a few good damp proof slurries available and they are very easy to apply, but I suggest that you check first the level of damp you are dealing with. 25mm is quite thick. You may be better advised to apply a trowelled screed with a waterproof polymer in it. You could apply a slurry first or you may be able to use an epoxy DPM and then apply your screed. Quite a few options really.
    Check out "EPROSEAL" by Parex or "StrongCoat DPM".


  • #3
    TiNcAn
    Registered Users, Registered Users 2 Posts: 154 ✭✭TiNcAn


    Safehands wrote: »
    TiNcAn wrote: »
    I took up tiles and grout in an old kitchen extension to reveal an old damp concrete floor which a tanking slurry was previously applied to.
    My aim would be to put down laminate but the subfloor obviously does not have a DPC and is quite rough and uneven (up to ~25mm). To deal with this I would like to apply a tanking slurry and then lay a self leveling compund.
    I am getting in touch with some manufacturers whether they have a combination of products that would be suitable for this purpose. I asked my builder if he could quote for this job but am considering doing it by myself.
    Does anybody have any advice on a tanking slurry and leveling compound that would be suitable for this purpose? Or suggest a different approach?

    How do you know it is damp? Is damp visible or do you just think it is damp? There are a few good damp proof slurries available and they are very easy to apply, but I suggest that you check first the level of damp you are dealing with. 25mm is quite thick. You may be better advised to apply a trowelled screed with a waterproof polymer in it. You could apply a slurry first or you may be able to use an epoxy DPM and then apply your screed. Quite a few options really.
    Check out "EPROSEAL" by Parex or "StrongCoat DPM".
    Sorry, just seeing this post now. The ground itself is quite damp but it has dried out a good deal since it has been exposed for the last few weeks.
    I spoke with manufacturers of leveling and DPM compounds and got some conflicting information. Both said that applying a leveling compund up to 25mm is no problem but one said that if there is no DPC then applying a tanking slurry or DPM epoxy or similar would stop rising damp but not the hydrostatic pressure. The pressure would build up an eventually cause the floor to bulge and leveling compound to break off and let through some moisture. 
    So I think the more conservative approach would be to put down a DPM or something like "Aquaprufe" followed by a sand & cement screed of at least 50mm. So I am now investigating this approach.

    Not sure if you have any other opions on this?


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