Damp patch on lounge wall

1399steve

Hi all, I've just noticed a damp patch on my lounge wall and I'm after ideas as to what the cause could be. The damp patch is about 2ft across and about 6ft up the wall. It's an external wall and I don't think there are any water pipes in the wall (but not 100%.

I thought maybe the damp is coming from outside - the pointing is a bit iffy. Any ideas?

smcqis

is it close to outside guttering? does the room gent ventilatation?

1399steve

No its not near to outside guttering, we're an end terrace and the wall in question is the gable end.

Room is reasonably well ventilated I think, either way though, the level of ventilation has not changed in the room in 3 years but the damp patch has only just appeared!

Doozergirl

If the pointing is iffy, your answer is there. If it's halfway up the wall it's penetrating damp.

1399steve

Thanks for the info, just wanted to check there's nothing else to consider, I'll Google penetrating damp, doesn't sound too good though! If I get the pointing sorted will it just dry out eventually or do I need to do anything else?

ariba10

I have known of a case with a couple of patches of what appeared to be damp on an outside wallpapered wall.

When the paper was stripped off, there were patches where someone had attempted to clean off gloss paint from paint brushes.

These were cleaned off and no further trouble. We assumed it was condensation.

FOX_HOUND

Never seen any real evidence of it but I have read some people claiming that damp can travel over cavity wall insulation.