Concrete floor needs damp proofing and levelling??

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20 Jan 2010
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Yorkshire
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United Kingdom
I've just removed bitumen from a concrete floor, they had separated and it came up really easily. The bitumen was anywhere between ½" and 1" thick. The concrete floor appears damp - there is also a huge hole (in the concrete but not through to the earth) which has been filled with grit sand!

I need to level the floor and damp proof it, but with what and in which order and I've only got 1½" max, due to the external doors being low threshold.

I'm not putting in underfloor heating and not tiling - it will be either carpet or laminate finish.

Any advice would be much appreciated.
 
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You need a liquid DPM (googe it) it's expensive though. You can buy it as 1 coat or 2 coat. 2 coat is slightly better but takes 2 applications. That will damp proof the floor but its only 1mm thick. To raise the height you need a self levelling compound on top, underneath or both!!





I've just removed bitumen from a concrete floor, they had separated and it came up really easily. The bitumen was anywhere between ½" and 1" thick. The concrete floor appears damp - there is also a huge hole (in the concrete but not through to the earth) which has been filled with grit sand!

I need to level the floor and damp proof it, but with what and in which order and I've only got 1½" max, due to the external doors being low threshold.

I'm not putting in underfloor heating and not tiling - it will be either carpet or laminate finish.

Any advice would be much appreciated.
 
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