1960s bungalow concrete floor

1 Feb 2011
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United Kingdom
Hi - i have a bungalow with concrete floor. In one room, the floor has sunken and looks like it on a old issue and hasn't changed in the last 10 years.

the floor has sunken around 30mm evenly across the whole room, except for around the perimeter walls, where the floor rises to meet the skirting.

We're going to renovate the room shortly and would like to fix the issue so that there is an option of putting down hard floor covering...

The amount of make up is never going to be sorted via self leveller. What options are there?
- is it feasible to break out the screed layer and redo, making up the difference in the sunken concrete? Or is the reason it likely to have sunk is that there is only a thin crust of concrete over some lightly compacted crap?

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Do a bit of research on Red Ash Floors and check with your local council if they are a problem in your area before going any further.
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30mm evenly indicates long term fill settlement not a fly ash problem.

A well mixed, well placed screed on a good bonding layer, should be OK instead of expensive self leveller.

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