Low wall - straight onto soil?
I have sufficient old crazy paving slabs (ex council) to build a low wall, no more than 4 slabs high. This will act as the front of a rose bed and whilst it will do a limited amount of soil retaining, I am confident it won't need mortar.
Question is, if I level the soil and compact it, will that be suitable to lay the slabs directly down or is it highly recommended to put a layer of sand etc down first?
Thanks in advance.