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Marley Tiles On Bitumen, Which is the DPM?

Discussion in 'Floors, Stairs and Lofts' started by Martyn Bell, 17 Sep 2020.

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  1. Martyn Bell

    Martyn Bell

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    Is it the tiles or the bitumen used to stick the tiles down that is the DPM?
    We have Marley tiles in our 1957 bungalow. Some of the tiles are broken & some are loose especially near the skirting board where carpet gripper has been removed. We can see bitumen underneath the tiles. We want to fit vinyl sheet flooring. Can I remove the (asbestos?) tiles & use
    Ardex n.a or something over the remaining bitumen to level it off?
     
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  3. KenGMac

    KenGMac

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    Martyn Bell, good evening.

    The Bitumen is the DPM.

    The tiles are most probably "Thermo-Plastic" and will likely contain Asbestos

    There are a load of topics on this board on this subject, check out the "Search" option top right on the page??

    Ken.
     
  4. dazlight

    dazlight

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    It was a sort of Dpm but won’t work now.
    Yeah take up, double bag them
    Ardex NA & DPM1c system.
     
  5. Martyn Bell

    Martyn Bell

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    There is so much conflicting information about this. If the bitumen forms the DPM then why should I need to install Ardex DPM1c (expensive)?
    There is no damp in the property.
     
  6. KenGMac

    KenGMac

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    Martyn Bell, good evening again.

    This type of DPM was extensively used in Local Authority property [cheap and cheerful ?] but it tended to work, the problems arise where there are "breaks" in the very thin and now fragile what was a hot applied liquid, this liquid combined with the tiles and the tile glues managed to actually act as a DPM, the tiles in effect protected the DPM.

    As above "dazlight" the application of a modern repair medium should maintain the overall integrity of a robust DPM.

    Once the old Bitumen DPM fails, generally at the edges of a room, or at doorways it allows the dampness in the concrete slab to spread.

    Ken.
     
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  7. Keithmac

    Keithmac

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    I left our tiles down, filled any holes and then laid our Quick-Step flooring on top.

    For me there was no point causing a problem lifting the tiles when 95% were soundly stuck down and level.
     
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  8. Tigercubrider

    Tigercubrider

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    I can't comment on "removing" the bitumen but the reason you need to replace it with something, is that chances are, some of it came up with the tiles.
     
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