Thickness of hardcore


Postby katemcilwain » Wed Jun 27, 2007 8:54 am

I have ripped up the floor in my back extension and discovered the back 5m2 has not got a concrete floor, athough the rest has. the soil is thick clay and sticky. My builder has levelled it and says just putting a layer of sand on top is fine. I thought I would need to dig down and replace with hardcore though? I am concerned by the puddle of water sitting on top of it! How thick should the hardcore and sand be if I do? Advice please...
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Simply Build It

Postby locofox » Wed Jun 27, 2007 5:09 pm

That wont be sufficient as the moisture will rise up through the floor and it will be uneven.

The only thing to do is replace the part of the floor that is missing.

The area will require the following :-

1. 4 inches of harcore at least, (scalpings or similar), and compacted using a compactor.

2. then, screeded over with sand.

3. then install a plasic membrane to prevent the damp from rising.

4. then at least 4 inches of concrete on top and leveled.

5. you could also get it screeded but it depends on the finish that you require. 2 inches at least.


You would have to remove the earth to a sufficent level to acheive the correct finished level.

Hope this helps.
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Postby katemcilwain » Sat Jul 07, 2007 10:17 pm

very helpful thanks
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