Damp proofing single brick wall

lokz

Hello,

As part of the garage conversion, I am construction a stud wall about 50 mm away from the single brick wall . After researching online, I will be damp proofing the single brick wall with KA tanking slurry (https://www.diy.com/departments/ka-tanking-slurry-25kg-tub-grey-water-proofing-damp-proofing-for-concrete-and-masonry/5060718518537_BQ.prd) before building the stud wall.

There is a existing cement render about 5 mm thickness. Again my researching online mentioned that it is better to remove the render and damp-proofing it .

Need some advice regarding the same. Attaching some pics. (existing stud wall was built temporarily by the builders)

grumpy_codger

I'm no expert, but how is srurry better than a simple plastic membrane?

lokz

https://forums.moneysavingexpert.com/discussion/comment/81960516#Comment_81960516

Because the slurry permanently becomes a coat on the brick wall unlike a sheet (again from what i read online).

stuart45

It depends on whether you get any movement in the wall to form a crack to allow moisture through.

lokz

https://forums.moneysavingexpert.com/discussion/comment/81960816#Comment_81960816

You meant in the future or part of the doing current work. Any suggestions to avoid cracks.

From what i read and understood, KA tanking slurry or any alternatives are better than blakcjack because it is more breathabale than blackjack and unlike a dpm , is more permanent. I also have a lot of DPM left over, so might use both tanking and dpm. Appreciate any advice.

I see the current cement render has many cracks and chipping off and hence wanted to remove it fully rather than putting the tanking on top of it.

stuart45

Cracks that could happen in the future.