Marley Tiles On Bitumen, Which is the DPM?

10 Jan 2016
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United Kingdom
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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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??

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

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.
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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