Cause of damp on internal walls

adidas

Hello all


Have moved into a property that is around a 100 years old. The property has an extension to the rear.


The old house walls are opened up and make a large archway into the extension. About 50cm on either side of where the old house opens there is damp on the walls on the inner lip and the side facing into the extension. The other side of the wall (into the original bit of the house) is free of damp.


Trying to figure out what the cause of this damp is. I'm wondering if it is due to the walls being damp previously and maybe a damp proof course applied over them. I'm not sure there are any pipes specifically near this part of the wall.


The paint is bubbled up and peeling off the wall. There's not any mould as such.


Any ideas on how to resolve this issue or why this has occurred?

pendragon_arther

I'd get a dehumidifier turned on 24/7 and when completely dry see what occurs. It could take a few days to dry out.

ariba10

It is in all probability Condensation.

As "Pendragon_Arther" said. Invest in a Dehumidifire.

Ebe_Scrooge

CarpetCleaningMonterey wrote: »

i have no answer

In that case why are you posting ? Probably to build your post count prior to a spam attack ? Call me cynical .... but I've marked your post as Spam.

JohnB47

I'd have a look at the roof above that point - where that extension roof meets that wall. What sort of barrier (flashing?) is there and is it all intact. Unless, of course, there's a room above that point and a roof above that.

dampdaveski

Adidas,
If the damp is at high level it could have something to do with water ingress, if there is a rainwater pipe outside then that should be checked.

Remember this is a forum with the most basic information supplied, What you describe is something I see a lot of of and there is a good chance that when the extension was built the builder plasterboarded the new extension out using the dot and dab method (fixing plasterboard with adhesive)
they used the same plaster on the old walls where they meet the new ones (ie opened up archway) and you have a bit of salt migration into the plasterboard on the original walls.

Now of course I could be completely wrong, a picture would be good

DD

Robin9

We had a pinhole leak in a water pipe on the first floor - only leaked when we walked on the boards

adidas

Hi all

Thanks for your suggestions. Here are some pictures if it helps...

https://www.flickr.com/photos/130437483@N05/16953939371/in/photostream/
https://www.flickr.com/photos/130437483@N05/16768666149/in/photostream/lightbox/
https://www.flickr.com/photos/130437483@N05/16954898245/in/photostream/lightbox/
https://www.flickr.com/photos/130437483@N05/16953940711/in/photostream/lightbox/
https://www.flickr.com/photos/130437483@N05/16767420740/in/photostream/lightbox/
There is a small patch by the radiator in the extension but nowhere else

adidas

Will check out the flashing as well when I pop out but I would have expected the bit above the wall to be bubbling as well

saveallmymoney

I wonder what the temperature of these bits of wall are on a cold day, could well be condensation.

Maybe get a cheap IR thermometer and check it out.

spannerzone

I get some damp patches and mine was caused by condensation, improving airflow and extraction could solve the problem. Make sure the kitchen and bathrooms have extractor fans that vent outside.

Might be worth considering looking into Drimaster and some more info