I am in the process of replacing my kitchen floor with a new concrete floor (The old one was only a few inches thick with no insulation, DPM or hardcore beneath).
I intend to dig down the required depth and then fill as follows (top to bottom):
1. Concrete Screed, containing:
Electric floor heating cable
Wire mesh (to lift cable away from insulation)
2. Jabfloor 70 insulation
3. Concrete slab
4. DPM
5. Sand
6. Compacted Hardcore
The question I have is what is the required thickness for each of these layers and what mix (& materials) do I use for the slab and the screed? The surface onto which all this will be laid is quite thick clay which seems fairly solid.
Also I know that I need to put a layer of insulation between the screed and the internal walls, but I have also seen on some websites that this layer of insulation extends all the way down to the concrete slab - so that no part of the new floor is touching the walls, is this necessary?
I intend to dig down the required depth and then fill as follows (top to bottom):
1. Concrete Screed, containing:
Electric floor heating cable
Wire mesh (to lift cable away from insulation)
2. Jabfloor 70 insulation
3. Concrete slab
4. DPM
5. Sand
6. Compacted Hardcore
The question I have is what is the required thickness for each of these layers and what mix (& materials) do I use for the slab and the screed? The surface onto which all this will be laid is quite thick clay which seems fairly solid.
Also I know that I need to put a layer of insulation between the screed and the internal walls, but I have also seen on some websites that this layer of insulation extends all the way down to the concrete slab - so that no part of the new floor is touching the walls, is this necessary?