Marley Tiles On Bitumen, Which is the DPM?

[Martyn Bell]

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?

 

[KenGMac]

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.

 

[dazlight]

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

 

[Martyn Bell]

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.

 

[KenGMac]

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.

 

[Keithmac]

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.

 

[Tigercubrider]

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.