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I had the same thing in an old property that used to flood. It's some sort of old tanking, went over it with bonding as that is what was done previously. Had no issues.
 
Iv seen that around an old chimney before, it wasn’t plastic though some kind of bitumen soaked material
 
I would zig zag some of tapits tape on there first tight coat of hardwall leave that for a day then fill out with bonding and add some fibres then leave that a day then blue grit the whole wall then back next day to skim. 3 days with materials £675 (y)
 
I would zig zag some of tapits tape on there first tight coat of hardwall leave that for a day then fill out with bonding and add some fibres then leave that a day then blue grit the whole wall then back next day to skim. 3 days with materials £675 (y)
Cant get that tape for love nor money
 
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