Damp Concrete Sub Floor & Liquid DPM


Old 10-20-15, 09:20 AM
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Damp Concrete Sub Floor & Liquid DPM


Had damp under my laminate flooring coming through the old vinyl tiles (see photos). I have a 1950s bungalow with no DPM and on a hill with possibly high water table. Took the tiles up and painted a bitumen based liquid DPM (not the 2 part epoxy types that most other posts are about) on top of the left over bitumen adhesive.

Still have moisture coming through (I think) and small holes appearing in places, and after further reading, 50mm of concrete is required to 'hold it down' and stop penetration from hydrostatic pressure. However, I cant raise the floor by that much so wondering where to go from here as not much sticks to this stuff? I've read about sbr/cement slurry and thinking that should stick and may be worth a shot to strengthen it and add to the water proofing??

Any advice would be greatly appreciated.


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Old 10-20-15, 09:42 AM
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Welcome to the forums.

What kind of drainage do you have on the outside around the house?
Old 10-20-15, 10:01 AM
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Thanks for the reply. There is a metre wide path all around the house (which is well below the dpc), but the grass is always quite damp this end of the house as slightly cut into the hill. I've added a french drain to try and combat it a bit but not been very effective. I'm hoping the liquid dpm will help stop the damp rising up through the floor but wondering how to strengthen it now and stop it from lifting/bubbling hence why I'm thinking of slurry coats etc
Old 10-20-15, 01:20 PM
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No sump pump?
Do you have gutters?
Trying water proof this from the the insides just not going to happen.

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