Sand/stone only hardscapes - no soil

[Mr.Shenanagins]

For raising height and distributing the weight evenly I used egg crate, worked out well.

 

[Andrew Butler]

For raising height and distributing the weight evenly I used egg crate, worked out well.

It's filling the voids between the eggcrate that would then be a problem and cosmetic sand just disappearing.

I've no idea if the expanding foam will work but Polystyrene is a bit too floaty and expanding foam would enable me to conceal a weight amongst it to hold it down.
*experimentation still needed!

 

[oscar]

I’m sure Andrew I‘m not the only ones following this with great interest. Very intrigued by the expanding foam, cant wait for some of the obligatory/ but very welcoming pictures