Damp concrete floor

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Hi,

At the beginning of our saga, we were told that our problem with smell and mold was due to the condensation - poor ventilation. We decided to carry various precautions to stop this problem. But after spending a lot of money and time the problems persisted.

We’re experiencing mold grow; behind the kitchen cupboards, cabinets, under the bed, on skirting etc. With present musty and mildew smell, especially where the laminate floor meets the skirting. We removed the skirting, cleaned the mold numerous times with bleach, constant use of a dehumidifier, installed more vents, heat recovery system, checked any potential leakage, drainage, gutters, roof, drainage etc.

After the carried works, we suspected the problem lies in the floor, so we decided to rip out the floor tiles in the bathroom, dried the floor and then measured the dampness of the concrete floor itself. We were right! Damp concentration was over the limit. Then we’ve moved with measuring the floors through the whole bungalow; under the kitchen cabinets, under skirting, also the floor tile grout, under laminate.. All the measurements were over the limit.
Finally, we found the cause of our problem. Yuppie!!
Now, how to solve it? Cost effective? Not to messy?

Screed will not be removed. This is a definite NO, NO.
Our intention is to follow this procedure:
//www.diynot.com/forums/viewtopic.php?t=80131

1. Will this procedure work on the damp/wet floor?
2. Can we apply it partially? We do half of the room first, move the furniture across and then proceed with the other half

Many thanks
 
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You need to address WHY the concrete is wet first.
Drainage, rising damp, water leaks, streams under property etc..
 
You need to address WHY the concrete is wet first.
Drainage, rising damp, water leaks, streams under property etc..

From what we gather it may be to the damaged membrane.
Pipes and drainage were inspected with no leakage.
 
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You can't use that type of meter on concrete, at least not to get any actual readings. You can use one to map out relative changes in dampness, but the actual values shown on the meter are meaningless.
 
You can't use that type of meter on concrete, at least not to get any actual readings. You can use one to map out relative changes in dampness, but the actual values shown on the meter are meaningless.


Few bathroom floor tiles were already loose, before we took the rest of them out. Underneath were damp and black mold growing.

We compared the readings with the builders tester ''the one with a ball at the end'' and were very similar.

Floors readings catastrophic.

Had so many ''experts'' in house to solve the problem and lots of money has been spent. And they were wrong! None of them ever pointed the floor.
So where does that leave us now? What harm will do the process described in the link above?
 
Place a hydrometer on the floor and measure the relative humidity around different parts of the house and compare. Forget the Moisture meter unless of course you are a surveyor!
 
Sounds like the concrete has eaten away a copper water pipe to me. How did you test them?
 
Place a hydrometer on the floor and measure the relative humidity around different parts of the house and compare. Forget the Moisture meter unless of course you are a surveyor!

Which one do you recommend?
 
Sounds like the concrete has eaten away a copper water pipe to me. How did you test them?

We don't have any copper pipes. They're all plastic and none of them buried. They are all visible. Tested/inspected by a plumber.
 
I use a cheapie hydrometer. It will give you a better idea about damp relative to other areas. If you seal using a DPM, the water will just go elsewhere.
Regarding the membrane, I'm no expert, but have seen similar issues, the water is usually coming from somewhere.
 
I use a cheapie hydrometer. It will give you a better idea about damp relative to other areas. If you seal using a DPM, the water will just go elsewhere.
Regarding the membrane, I'm no expert, but have seen similar issues, the water is usually coming from somewhere.

Since our last post we've tested bathroom concrete floor.
Humidity was 99%. 'Plastic sheet test' over night: result water drops.
Some testing has been made in the living room: middle of the room on a laminate flooring 65% and edges 78%. Next step is the kitchen and the bedroom.
 

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