Best way to prevent penetrating damp 9" wall

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Hi all!

I'm hoping to start renovation on my kitchen soon into the new year.
The problem is three walls of it are external walls and are 9" solid walls and thus damp penetrates through them (yes someone has tried to inject a DPC lol).
I'm not sure what the best course of action is, although I've already decided I need to build a stud wall away from the external walls.. So, do I need to ventilate the gap? Tank the walls? Add insulation in the gap or anything else I haven't thought of?
I've had conflicting advice from two plasterers so far..
Thanks all!
 
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penetrating damp or rising or both? what advice did they give?
 
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Rising and penetrating, it's a solid 9" wall with no proper dpc. It's had an injected dpc but doubt that's doing anything, and it won't stop penetrating damp anyway.

I've been advised to "tank" the walls before building the stud wall away from the existing walls.

Is it best to tank/seal the walls or would ventilating the new sort-of cavity be better?
 
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vent . tanking is pointless if you intend building a stud inside . plus it’ll encourage condensation . Is it rendered outside?
 
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Find and cure the source of water. You say it's a kitchen so it might be a leaking pipe in the floor. Is the floor concrete?

Leaking drains are more likely to make a damp patch on one wall, close to the leak.

Please add photos

How old us the house?
 
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Get an independent surveyor with a specialism in damp who can recommend appropriate action. It will probably involve venting the wall, and maybe chopping off the plaster, plus a stud wall.

Blup
 
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Find and cure the source of water. You say it's a kitchen so it might be a leaking pipe in the floor. Is the floor concrete?

Leaking drains are more likely to make a damp patch on one wall, close to the leak.

Please add photos

How old us the house?

There are no pipes or drains in the floor to leak, all gutters good etc.

Built in approximately 1870. The property is in an area very exposed with no shelter from wind and so gets battered with wind & rain.

I think I am gonna have to get a specialist to have a look, still getting different opinions on whether to tank or let it breath & ventilate although thinking the latter sounds like the most sensible option.
 
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Yes, drying-out is better than covering up. Can you post photos?

Don't invite anyone who sells silicone injections into your home.
 
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It's already had a DPC injection prior to me moving here. Even if it did stop rising it ain't gonna stop the penetrating damp.
 
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