You can lay tiles over Ecobase, they just won't stay put.
A point worth knowing about shingle (as opposed to the decorative stuff) is that a lot of it comes from a saline environment so will not be conducive to plant health. Naturally, weeds will colonise it and flourish regardless.
Any loose stone surface will gain fertile soil from rotting leaves, dust or whatever within very few years. It will grow weeds whether you put down an underlay or not.
You can lay tiles over Ecobase, they just won't stay put.
A point worth knowing about shingle (as opposed to the decorative stuff) is that a lot of it comes from a saline environment so will not be conducive to plant health. Naturally, weeds will colonise it and flourish regardless.
Any loose stone surface will gain fertile soil from rotting leaves, dust or whatever within very few years. It will grow weeds whether you put down an underlay or not.