Help with tanking a cellar wall

Hi no I wouldn't tanking over it I would box it out with metal stud with dpc protection and then use moisture board on the stud

Hi There’s different solutions for these type jobs, If there is a solid floor then I would presume the side walls go right down to the solid floor, if that’s the case then the bottom of wall that’s in bad condition You can tank it and it will bond to damp substrate ! Paint Sbr bonding agent On the areas to be tanked. Apply tanking on it twice over 24 hour period Seal every Crack & hole first. Then spray or brush Sbr on the tanking (Chemical key ) let it go tacky before applying waterproof renders. You just said you was tanking so not sure what finish your after ! On some jobs you tank and use membranes and sub floor evaporation trays ect all Depends if it’s damp or wet in the cellar Anyway good luck with the project

Personally I’d fit a delta tanking membrane to the brickwork, then use treated timber Battons with plasterboard fitted to these with a skim finish. I’d advise against metal studding as these are prone to rust in cellar conditions.

That sends alarm bells ringing. Do you get free water through the wall? If it's clay, then it almost certainly is the foundation and there is precious little you can do with it but attaching anything to it is not good practice. If you are going to use it I would suggest you build a completely independent wall in front of it but make sure you allow for some drainage behind the new wall. Under no circumstances should you block it in without making some allowance for water egress. If it is to be disturbed you should engage a structural engineer or a CSSW surveyor to design a waterproofing system