Agreed. My main concern is the bottom left corner area in my diagram, that's why I have the sensor there.
Humidity in subfloor void
- Thread starter Kaymo
- Start date
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I'm fairly happy now that the ventilation is going to be ok with this floor, but before closing I have noticed that there is a lot of dampness around the metal pipe that has been run underground to provide subfloor ventilation. No actual water/drips etc, just very damp clay or possibly damp lime mortar around the right edge of the pipe that feels soggy to the touch.
The pics below show where the pipe enters the room, and the outside vent this pipe connects to is at a higher level. I am baffled by this one. I am fairly certain there are no water leaks from outside tracking in to here, the room to the other side of this pic is completely dry on the walls and floor, and the pipe itself is very dry inside, so the water doesn't appear to be coming in through the vent.
In my head there are two possible causes. One is that the outside of the pipe is tracking in small amounts of ground water/dampness from under the solid floor in the previous room (which is at a higher level), the other is that water is condensing on the pipe. The latter seems unlikely, especially when the dampness seems to be to the outside and above the pipe, but if it is the former then there is probably nothing I can do about it other than lift and dig out the solid floor in the adjacent room.
I realise this is probably a difficult one to answer, but just looking for a sounding board in case there is something I am not thinking about.
The pics below show where the pipe enters the room, and the outside vent this pipe connects to is at a higher level. I am baffled by this one. I am fairly certain there are no water leaks from outside tracking in to here, the room to the other side of this pic is completely dry on the walls and floor, and the pipe itself is very dry inside, so the water doesn't appear to be coming in through the vent.
In my head there are two possible causes. One is that the outside of the pipe is tracking in small amounts of ground water/dampness from under the solid floor in the previous room (which is at a higher level), the other is that water is condensing on the pipe. The latter seems unlikely, especially when the dampness seems to be to the outside and above the pipe, but if it is the former then there is probably nothing I can do about it other than lift and dig out the solid floor in the adjacent room.
I realise this is probably a difficult one to answer, but just looking for a sounding board in case there is something I am not thinking about.
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