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DPC is shit. You need to find where the water is coming from.
Assuming your property is old, post a pic in the attached FB group and you may get some good advice.
https://www.facebook.com/groups/143020647730378/?ref=share
user67526
What's the next extreme step to take to cure a damp fully internal wall after chemical DPC and cement render [predictably] failed. Wall is terminally fucked in some ways: lime mortar, fully internal and surrounded by a retro fitted concrete floor that I suspect breached any original DPC.
Actually decommissioned a leaking pipe under the floor (down a 200mx 3ft tube set in to the floor!) but still the dampness comes.
It's retrofitting physical DPC a thing? I know the 'proper' thing to do would be reinstate suspended floor, but there's no way that's going to happen while we're living here.
Not convinced lime alone is gonna work in this case as the wall will just be breathable but damp, surrounded by a very non -breathable floor.