(Pics included) Does anyone know anything about damp

[dampwallnc]

Just found this in the corner of the bedroom. The other side of the wall with the plug on is our next door neighbours bathroom and I think their bath/shower.

The other side of the corner is an exterior wall.

Does anyone know what kind of damp it is? Is it likely to be caused by a leak from NDN bathroom? If not what could it be?

I've had a terrible year and this feels like the final straw. I have no idea if it's really bad and needs fixing right away or if it will just go away. This is my first house and I'm not very good at these kinds of things yet so apologies if I sound a bit dense.

I can find a damp person to come out and have a look but I've had a really bad time with tradespeople over the last year and I worry they will take advantage because I don't know any better.

Any info/advice on this is welcome!
Thanks

Yeah, it looks like a leak from the NDN bath based on this limited information.

Ask if you could take a look. The sealant often fails after a couple of years. It may be a shower over bath and this is the shower end.

Is there any guttering/pipes running along/down the exterior wall?

Its either a leak from outside (due to broken guttering, etc) or from next door's bathroom. My money would be on the bathroom.

Try not to worry too much, damp happens and as long as you stop the source you can easily repair it.

Have a look outside to make sure there's no broken drainpipes/ holes in the brickwork. But it's almost certainly your neighbour's bathroom and their responsibility to fix. Can you ask them to check for leaks as a first port of call?

I'll check the guttering and see if there's anything obvious, if not I'll have to knock on.

We don't really know them so I hope they're nice about it. I've let on before but they seem a bit standoffish.

What should I do if they just say there's no leak? I have no idea if they own their home or private rent.

is this on the ground floor?

is it a concrete floor?

if yes to both, it could be either an internal or an external source. If external, I would expect to see a downpipe or drain on the outside, just about on the boundary between the two homes, with signs of rainwater or bathwater.

Bath leaks are often around the height of the rim where it is (supposed to be) sealed against the wall, or else under the taps and plughole. This would be on the floor, not the wall, and not in the very corner because it will be spaced away a bit. Shower leaks are usually around the seal of the tray, but may be under the waste. A leaking mixer tap would be higher up, and not usually in the exact corner.

Leaks onto a wooden floor usually drip through, but a leak onto a concrete floor can soak into the wall.

p.s.

pull up your carpet in that corner, you will see if the floor is wet and the carpet might rot.

No it's upstairs. Good idea about the carpet, I'll pull it up tomorrow and have a look.

Can't see anything obviously wrong with guttering but I imagine I'd have to wait for it to rain to see if there are any leaky bits.

Thanks all

A bath is typically 700/800mm wide, and about 400mm high.

Does the wet patch seem to correspond with the rim of a bath leaking against the wall? That could be a clue.

Have a look to see if there is a downpipe on the outside of the house at that point. It will also give you a clue. Gutters do sometimes drip or spill, but usually along a fairly wide expanse of wall, unless there is an actual hole or broken joint.

Boilers and older WC cisterns often have an overflow or vent pipe sticking through the wall. You sometimes see green moss or grey limescale on the wall under them where a long-term fault has been neglected. The pipe is usually visible.