Waterproofing Render

[Skavenger]

Hi;

Can anyone recommend an additive for mortar mix to render onto concrete to prevent ingress of moisture if any. I am rendering around and over an old footing that has been exposed and underpinned with blocks and concrete. The render will be inside my newly built workshop.

More info here and in the project build here if you need it

 

[^woody^]

Cement