Hello
I have a large garage (90m2) that is currently bare double brick. The garage was built with plumbing for hot and cold water, a grey water drain and a black water drain. I guess the original owner was considering one day putting in an extra toilet, bathroom or laundry. It currently only has a simple and cheap sink attached to the plumbing and the blackwater is capped off. There is about 0.8m2 of tiles above the basin. It is a basic splash back and I doubt there is any waterproofing under the tiles as the sides of the sink are all bare brick.
I am about to start some garage renovations which includes getting the internal walls rendered. I’m leaning towards acrylic render. I will be removing the existing basin and tiles. I’m not exactly sure what we will put back in place of the sink, perhaps a much bigger one, maybe one of those big dog wash tubs. It won’t be a shower or toilet. It may be a year between getting the render done and figuring out what to do with the sink.
So I can start planning, my question is this. What do I do about waterproofing? Can I just render now and put waterproofing over the render later or do I need to do some waterproofing before the render goes down? Does it need waterproofing at all?
Thanks