Damp Proofing an example external solid wall.

[Psutherns]

Hi
First time posting here.
So I have wall that is in an alcove between an internal wall and fireplace. It’s is a solid 9 inch external wall, We found damp coming through the wallpaper that had been put on (not by us).
I found the cause of the damp, a path was put in years ago that was above our DPC. I cut the path back and dug a channel, which I filled with gravel too 200mm under the DPC. I did this earlier in the summer and the bricks above the DPC that where previously wet are no nice and dry.

On the inside walls it looks like someone has previously hacked of the old lime render and replaced it with bonding coat and gypsum plaster as that just fell away from the wallpaper once I removed the wallpaper and skirting board, they have only done this to roughly about a metre up the wall. But never fixed the damp ingress. The bricks under the damaged plaster and bonding seem dry.

So I intend on using a membrane such as the permaseal as a preventative measure of any moisture coming through the new finish. I was honestly no to dot and dab to the wallpaper once as we have a coving. So battening is not a great option. I know dot and dabbing to the membrane will be ok but will it be risky straight on the brick over the membrane?

Or does anyone have any other ideas as how to finish the wall?

 

[JessThePlasterer]

Hi

So long as the ingress of water has been solved you could use renovation plaster instead. Limelite is good. It breathes, has thermal properties and anti salt. Just whack it on as you would any backing coat and go over the next day with their finishing plaster. No pva or slurry. Just water . Has never let me down

 

[bobski]

Sand and lime?

Possibly how the house was originally?

And possibly match in with what is above the damaged areas.....?



Breathable
Long lasting
Flexible

 

[Woods]

they have only done this to roughly about a metre up the wall. But never fixed the damp ingress. The bricks under the damaged plaster and bonding seem dry.

seems like rising damp. I would use lime plaster and nothing else. Lime will get rid of the moisture and over time take the hit from the salts leaving the bricks intact. But can't close off the pores for it to work.

If you shut it in with a moisture barrier, the salts will slowly pulverise your bricks.