I'm going to cover my balcony in elevated earth and then farm 900kg of potatoes in the city! Why aren't you using your...

I already told you, his place will hold 400kg/m2 minimum. Shitload of people here grow stuff on balconies here. Many go for a limit by making a fucking pool out of their balconies, which is something I wouldn't recommend at all (usually putting around 900kg/m2) but it's still fine and done for decades.

He could do a nice four step dance, up there too, maybe a good German Clog Hop?

I've got nogs for neighbours but they're two fairly personable middle aged women. Would be much better if I could grow them under a non-conspicuous cover inside what could be mistake for a bike shed or something. But that's turning it into a bit of a hassle.

No you're just a moron who thinks commie era concrete that is over 60 years old will hold the weight of a car when the soil is dry and two cars when the soil is wet and the potatoes are fully grown. You're a mouth breathing retard giving someone advice over the internet that could be potentially fatal. Cunts like you need to die out already.

You're gonna walk out to the world turning into you being covered by your dirt as you fall to your broken neck and/or your stomach pierced with lumber.
Those are not built for wet soil.

Commie era concrete is stronk.

Sorry, but they were not planned to withold such loads, be careful you'll kill your neighbours.

If they can't access your balcony (don't count on that), you could consider running some screen across the barely open door, and run the pumps inside and climb the assembly up the walls. You could actually get a pretty good trickle-down flow going like that. Honestly, the pumps are like US $20. The equipment is normally a metal, like a gutter aluminum, but in a pinch you could use a coated sealed wood run. If you have metal thieves, it might be the end.
Some of the stand-up versions wouldn't be easy to disassemble, and you might be able to bolt them down in some fashion.

Are you burgers retarded? I live on ground floor.

>old shit made by commies is strong
shut the fuck up kid, adults are talking.