/diy/ - Do It Yourself

>>2656396
>they dont sell dpm where you live? plastic sheet for waterproofing concrete.
i thought that worked for damp course but not for making a whole bubble underground that will be surrounded on all sides with water, wouldn't you need bunker-shaped dpm? is there any way to join sheets effectively enough to stop water ingress at the joins?

Here's a little tidbit about retaining walls.