this post was submitted on 14 Nov 2023
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Well of course you'd use waterproof base layer, typically you'd use several even without the plants. It's tried and tested with multiple cases of failing with age. That's the issue. Even just flat roofs have been a failure point even without the plants but soil and plants are a definite concern for builders when talking long term.
Are you a builder? Do you have any experience installing and maintaining green roofs? Your assertion than you'd typically use several waterproofing layers suggests not. I have experience building these systems in the real world and the documentation to support their use. BTW - flat roofs aren't a thing. Expect in traditional building in desert areas. "Flat" roofs aren't flat.
I'm a construction engineer, though I think that's just civil engineer in lot of the world.
I assumed everyone knew what I meant. See some apartment building roofs.