Mini City

[Jack3M]

Roots will work thru the concrete even at 2". I suggest you put down pond liner first.

[Just_Build_It]

Originally Posted by Jack3M

Roots will work thru the concrete even at 2". I suggest you put down pond liner first.

The only issue with pond liner is that it will hold water. I I'll probably end up putting some gardening fabric down. I've also tossed the idea of using pond liner but with the torrential rain we see here, I'll end up having an underground spring or mosquito breeding sanctuary.