Help........... Flaky / Damp ?? Interior Wall

[RunAwayHorse]

Hi all..............I have an extension where one of the interior walls, which faces north on the outside, is rendered.

Since it was completed by the builder a couple of years ago, the interior plaster has been gradually flaking away ( bubbling in parts) and when you rub it the whole area just crumbles back to the block work.

I am assuming ( perhaps incorrectly) that the damp from the outside wall is penetrating through and ruining the interior paint on the wall. I have central heating in the room so it is not cold in any way and its just its just this one wall.

I had painted the inside with a damproof paint but that too has now broken down in parts. Can anyone suggest how I might over come the problem.

I had thought of covering it with thin polystyrene roll, but I don't want to do that if there is an easy and better remedy.

Many thanks in anticipation and a very Merry Christmas to you all..... Sincere regards................Pete

 

[Zampa]

You really need to sort the damp source pete...dont waste your hard earned on covering it up until you find out why its blowing.

 

[RunAwayHorse]

Hi Zampa...

Many thanks for our reply. The deterioration on the inside of the wall starts at the top and spreads downwards? On the outside of the wall are some block/paving steps positioned on the right hand side of the wall as you look at it and these lead upwards to a raised doorway.

This gives a triangular shape to the outside of the wall. As stated, it is all north facing and I am beginning to think that, when it rains and then lays on the steps until it drys out, maybe this water/ dampness is seeping through the outside wall to the inner and creating the 'breakdown of the inner wall's surface? Is that a possibility?

Any ideas on a tried and tested product that I might be able to use on the outside wall, that would assist in preventing the possibility of penetrating rainwater or, any suggestion as to how I might be able to proof that bit of the outside wall, would be extremely helpful.

Once again many thanks a a Very Merry Christmas to you and yours - Pete

 

[Zampa]

Hmm...im no builder (ask the mrs!) but can I assume that a part of the wall inside is below ground level outside?...

If that is the case you need to dig it away and apply a few coats of bitumen.

Work on the source until its sorted...doing anything inside will be a waste at this stage.