damp showing on inner face of wall

[PembsDan]

Hi All
Anyone experienced anything like this before, we have a pine end wall, SW Facing in West Wales, so we do get some weather down this way against this wall, see attached picture from recently you can see the blocks themselves, Roofer stuck as doesnt appear to be any issues in the loft, nor any cracked tiles up above, but looking at the picture, surely water is engressing into the cavity somehow to show itself like this?
The issue doesnt show in the rooms below this one?
Anyone seen anything like this before?
Cheers

 

[mrrusty]

I don't think that is water leaking. I think it's condensation on a cool external wall. It looks too evenly distributed to be a leak.

 

[PembsDan]

I don't think that is water leaking. I think it's condensation on a cool external wall. It looks too evenly distributed to be a leak.

Thanks for taking the time to reply
Even with the wall being the inner leaf? with cavity then outer leaf?

 

[mrrusty]

Even with the wall being the inner leaf? with cavity then outer leaf?

I only suggest it as a possibility. However, if it's getting a lot of weather it's possibly getting quite cold. If you have fairly normal "air" inside your house at say 22-25 degrees and 50-70% humidity during the day, the dew point is going to be in the 10-14 degrees range. At night, when your heating is off, is it possible that the wall surface is getting as cold as this? Of course when it warms up, any condensation should re-absorb into the room.

I don't think the dark colour helps - it's like sweaty armpits - it shows up far more on a darker shirt than a white shirt!!

 

[PembsDan]

That is possible, we have always suffered with having to wipe the corners of the walls in that room, and have used silk paint so as to not keep having mould spots appear, i think we were so schocked to see the pattern of the actual blocks that we are assuming some moisture on that inside leaf

 

[jj4091]

Is it the whole wall? Have you checked the thickness of the plaster?

 

[PembsDan]

Is it the whole wall? Have you checked the thickness of the plaster?

Hi

It isnt the whole wall no, its that section as per picture, the room was skimmed compeltley a few years ago

 

[mrrusty]

we have always suffered with having to wipe the corners of the walls in that room, and have used silk paint so as to not keep having mould spots appear

I think you have just identified the issue - mould tends to appear where there is surface moisture/condensation

 

[PembsDan]

Agreed, it was just a bit shocking to suddenly see full concrete block outlines in our bedroom!
Maybe i need to think about dot n dabbing the wall...

 

[JohnD]

we have a pine end wall

what do you mean, pine?

 

[PembsDan]

Gable end?

 

[freddiemercurystwin]

Ahh so 'pine' end is a term common in Wales meaning gable end?

I've never heard of that before.

 

[PembsDan]

Dunno really, i thought that was the term for the end of a house, either way its the end of the house thats triangular

 

[mrrusty]

You learn something every day "Gable end" is "Pine end" in Wales. - I googled it - Who'd a thunk it!

 

[PembsDan]

lol, pleased to have contributed something of value