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Discussion in 'Subfloor Preparation' started by Mwfloor, Aug 5, 2020.

  1. Mwfloor

    Mwfloor Well-Known Member

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    Hi chaps,

    Got a customer who wants a fully bonded but has this running right through the room. It houses pipes & has slight movement when stepped on.

    What would you do to solve this.. I’ve thought of a looselay option, but they really want a heritage floor..

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  2. mjfl

    mjfl Well-Known Member

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    Rapid the edges, screed floor up to it then softlay then heritage
     
  3. merit

    merit Well-Known Member

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    Can’t you just fill it with screed or cement? We had one with a ply top that we changed for cement board as we needed to dpm the entire floor


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  4. Mwfloor

    Mwfloor Well-Known Member

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    Oh forget to add It’s a really old house so will require a DPM. Can I take the top off and fill it in? Will I need to wrap the pipes..


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  5. Mwfloor

    Mwfloor Well-Known Member

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    I’ve not come across softlay? What is it


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  6. mjfl

    mjfl Well-Known Member

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  7. Mwfloor

    Mwfloor Well-Known Member

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    Good to know, so the softlay will act as a moisture barrier? How do you bond it to the subfloor..


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  8. Mwfloor

    Mwfloor Well-Known Member

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    Interesting stuff, if this is self adhesive to subfloor (and can protect 90+ RH) plus bond with my own adhesive on top I’m having it..


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  9. mjfl

    mjfl Well-Known Member

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    it's loose laid and you peel off the top as you fit
     
  10. Mwfloor

    Mwfloor Well-Known Member

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    will it act as a Dpm?


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  11. Spacey

    Spacey Super Moderator Staff Member

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    Jesus what the hell is that?

    Can it be removed and boxed in with ply ?
    Screed upto ply level and feather over

    If you use these underlay products you have to glue them to the floor and subfloor has to be completely flat and smooth anyway not loosely or they fail
     
  12. Mwfloor

    Mwfloor Well-Known Member

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    Maybe but it’s not something I would attempt, they are waiting on builders but i doubt they will do anything with it... This is the reason I’m here, I’m trying to find the best practical solution. That softlay seems good but I’ve never used it, there is one you can bond yourself but I don’t know how well that will work with rising damp


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  13. Spacey

    Spacey Super Moderator Staff Member

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    I'd be removing it
    DPM and span 9mm ply over it glued to each side screed to to ply and feather

    Builders would probably do f all to help
     
  14. merit

    merit Well-Known Member

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    I would fill it and cement board it to make it more solid. Also won’t be effected by a dpm over the top. The trays sometimes have a ledge so you can check the thickness of board needed. Could fill with granno so it can be easily removed if you get a leaking pipe? Or use softlay but you might want to strengthen it if it’s flexing a lot


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  15. Paul webb

    Paul webb Well-Known Member

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    Possibly remove it, put timber or ply in the channel to support a ply top narrower than the channel, so you can make it flush or lower than the floor, then crack bridge it
     
  16. Distinctive Adam

    Distinctive Adam Well-Known Member

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    I would smooth it out with feather etc, use murexin d499 moisture tolerant adhesive, adhere Softlay fleece 95%rh 19db, then use murexin d391 ps adhesive and fit the floor, will give you a 99%rh barrier.
     

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