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Damp Proofing

Would walls/floor dry out on its own after a leak? got a minor mould problem

Hi there

Recently I discovered a leak in the little room where my immersion boiler is kept. A small splash drip through the tundish turned into a mini flood over a period of time as I wasn't aware of it.

I isolated the splash drip with a bit of material so it won't happen again and drained/dried up the room which had a thin layer of water. An engineer will come fix the source of the water going through the tundish (one of the pressure valves are probably going)

Unfortunately, this water has creeped underneath the floor to nearby rooms.

The immediate walls around it showed signs of rising dampness (though I'm on a 2nd floor of a somewhat new build flat, 8 years ago) up to approximately knee height. Then I noticed some mould appeared on it.

I have wiped away the mould with the usual products and I have been running a dehumidifier which has drawn some good amounts of water.

I cut off the water for nearly 2 weeks now and my measures would alert me to the drip if it should happen again before it can build up to a mini flood. A spec of mould appears now and then, which I wipe away immediately. Shall I keep this up, or do I need to seek some help for the walls affected?

Thanks for your time in reading.

edit: I can't figure out how to reply to comments (if it is possible), but thanks Timothy in replying prompty. It seems to float between 35-45% currently according to the device.

I've also noted earlier that one of the affected walls in the bedroom has sun shining on it towards the evening (though not to floor level) so I've moved everything out of that corner of the room (it was a table before) to give it more air/space and also to let the sun bask over it to assist in the drying (although it's not obvious that it's wet).

On the other side of the room where the boiler room is, is a corridor leading to the front door. Because it is a flat, no sunshine gets there, and temperature there is probably the lowest. I've turned on the heater present there to give it some warmth to help with drying on the wall there that's slightly affected.

It's really not apparent the walls to wet, they feel like the other walls in the flat when touched, cool. I'm fighting to keep on top of the situation.

edit 2: No further questions, but thanks again Timothy for providing a follow up to my edit! I'm just going to battle it for the next 2~4 weeks to see what comes up. On the face of it, it's all dry. A tiny spec or 2 (or I'm paranoid and seeing things) surface here and there at the end of the day. I'll just need to be patient now and monitor.

1 Answer from a MyBuilder Damp Proofing Specialist

Best Answer

You did the right thing using a dehumidifier. Does yours give you a reading of the relative humidity? If it does and that figure is above 70% then thats usually a clear indication that things are not fully dry. Other factors will affect the relative humidity like living conditions (showering cooking etc) but if its still collecting water (esp with the current weather) then things may need to dry further.
The mould will keep re-appearing whilst moisture is present, because even though you wipe it off, or even bleach it. You dont kill the spores and these re-grow
It seems you are doing all the right things especially regarding air flow to corners. When new plaster dries its always slowest in corners.
I did a little research and the optimum range for home humidity is 40-60% so hopefully this will be resolved soon.
If you need any advice regarding re-decoration then add an edit to your qusstion and i'll try and help


Answered 8th May 2018

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