Concrete floor

My kitchen and dining room both have concrete floors and until last week there was a dividing wall. I've now removed the wall, using a cheap SDS drill, to open it up into one big room.

After removing the blocks and mortar I'm left with a trench in the floor that needs filling. The floor appear to be in two layers, there is one layer of conrete and a second layer maybe 1-2" inches thick on top of that. The dividing wall sat on the first layer, which is why I now have a trench to fill.

The mortar the wall was resting on had some roofing felt type material between it and the blocks, presumably to stop damp coming up from below into the wall.

Do I need to put some sort of damp proofing in the trench before filling in? I can't see any sign of damp proofing between the thin upper layer of concrete and the lower first one, so is it necessary for me to put some in?

TIA

Reply to
Simon Barr
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The concrete sits on a visquene layer in modern houses. The bricks sit on DPC a black waterproofmaterial.

The layer on top of the concrete is called screed. A layer of cement and sharp sand. Nowadays the concrete is often worked into a fine enough finish to eliminate the need for a screed. Deficiencies are made up for with self leveling compound.

Reply to
Michael Mcneil

A friend has suggested painting the inside of the 'trench' with a liquid DPC before filling it in .

Does that sound good?

Cheers for the info, most of this is new to me. I've never layed a floor before.

Thanks.

Reply to
Simon Barr

Yes tar or bitumen paint and you can also get some waterproofing additive for the cement mix. Mix 4:1 sharp sand:cement.

Reply to
Michael Mcneil

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