Thanks for your reply. Do I really need MOT 1 on top of the clean stone sub base? Or can I just mix up a thick layer or mortar and lay the sandstone there? Also is there any membrane necessary?
Cheers
Hi
We want to extend our raised patio over the adjacent flower bed. For this we have build a retaining wall enclosing the flower bed. The maximim depth of the void is approx 600mm . We will lay sandstone on wet mortar.
The next step is preparing the sub-base. I see the following options for...