Skip to main content

Ready to hire?

Post your job in minutes, browse real reviews and choose who to speak to.Post a job

Need some tips or advice?

Ask a question
Damp Proofing

Wet wall, wet under floor, plumber says no leaks

Anonymous user 23/02/2024 - 3.53 PM

I've recently noticed the bottom half of the wall just inside the front door of my house (party wall) is wet and the skirting crumbling. The stopcock is just under this bit of wall so I thought there must be a leak there, but when I took up the floorboard the tap was dry and there were no visible leaks in the pipe. The earth under the house was, however, wet for as far as I could reach. It smelt dank. Got the plumber in, and he tested for leaks but found none. He also had a look at the neighbours' water meters and no sign of movement there either. Is there any way this could in fact be rising damp? Would it come on as quickly as this and cover such a large area? I've lived here for years, and every other time I've lifted the floorboard to turn the stopcock off everything has been bone dry. The vents are all open and clear. Thanks for your answer, but I'm afraid I don't understand. A floorboard next to the wall has been taken up, and you can feel with your hand that the unplastered brick wall under the floor level is wet. The ground/soil/earth or whatever it us under the floor is also wet, and it is that that seems to be soaking up the wall. Which is why I was pretty sure that there was a pipe leak somewhere in the area... but plumber says no.

Are you a tradesperson and able to answer this question?

2 Answers

Damp Investigations

Rating: 5 out of 5
Southall
This is a common issue at front door entry areas to the floor void. There is supposed to be an air vent under the door frame . With the area being cooled by the cold water pipe, it’s partially worse than any other area of the void. Using a pointed tool or a small screwdriver, twist into the plaster to get an idea of the plaster thickness ; if it’s more than 3mm thickness , this will be hygroscopic dampness caused by plaster absorbing atmospheric moisture. Your pointed tool will not penetrate good render , only plaster . It’s not ‘rising damp’ but this will eventually manifest on the walls and skirtings . Adding , the wall under the floor is supposed to be wet, it’s an evaporation point for the foundations. The over site will almost always be wet and that’s what the sub-floor ventilation is designed to handle. From your description, it appears the ventilation is insufficient. Send me a video on WhatsApp if you like .
Answered21 September 2023
4

BNASH

No reviews yet

Leicester
There could be several reasons why this has happened ie if your house was built where there is underground water table if the level has risen then you will get rising damp, as the foundation footings are wet then it Is very much possible that it is rising damp, secondly if you dpc has been compromised or perforated due to aging this will also cause this problem. Either way it will need investigation by a specialist!
Answered30 September 2023
0