I'm currently mixing render to cover ugly brick walls in my front garden.
Let's say I want to use this recipe for the top coat, just for an example:
- Cement 1 parts
- Lime 1 parts
- Sharp Sand 2 parts
- Soft Sand 2 parts
The exact recipe isn't critical but my question is ... well a 25 kg bag of lime is much bigger in volume than a 25 kg bag of cement or sand, about twice or close enough, so are the recipes I'm finding online by weight or by volume? None of them say.
Now when I'm mixing mortar I just use shovels (Volume), and that seems to be the advice I'm finding online and cement and sand are pretty close in weight/volume so it's fine, but now I'm seeing this huge difference in the weight/volume of lime I am concerned that the recipes will be way off if I don't break this question once and for all.
Also, I've read all the articles that say it doesn't matter because sand and cement have similar density, eg: Understanding render mix ratios but please remember that this won't cut it when lime is involved because the densities are definitely different.