How can I treat the penetrating damp(rainfall) from ext wall

[steverino75]

I have a damp patch on my internal wall about half way up my stairs, so in between ground and 1st floor of my early 1900 terraced house. The patch appeared a month ago after some severe weather. I inspected the outside wall, the rendering is sound and there are no windows in the area, however the masonry paint looks pretty old, so I redid the whole back and side of the house and even though it has rained since the interior wall has dried out much to my delight...............that was until yesterday when again we have had recent severe downpours and the damp patch has returned (not as bad)

I have tried to look at this logically and cannot come to any other conclusion apart from the water is getting in straight through the masonry paint, render, brickwork, however that does seem improbable.

I did use the Fortress masonry stuff, which I know now is B& poo's own make and I regret that decision, but should it protect against a direct downpour?

Could I add coat of something like johnsons water seal over the top as extra protection or is this a waste of time as I already have the masonry paint on? would it adhere to the paint?

any help or suggestions would be gratefully received.

cheers

 

[joe-90]

Any chimney breasts near by?

 

[steverino75]

chimney was removed and was at the front of the house but good thinking.

the front of the house roof and back roof meet above the problem and there is a gulley in between, however i have been up there when its raining and all the water goes into the gutter and under the tiles is dry. even if water was leaking behind i would have thought the damp would then run all the way down the internal wall, not just a patch half way down.

could i just paint over the whole side with a bitumen paint and then put masonry paint over the top again or does the wall need to breathe?

 

[steverino75]

So does anyone know if putting a water seal over masonry paint is ok?