this post was submitted on 14 Nov 2023
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Ultra-white ceramic cools buildings with record-high 99.6% reflectivity::undefined

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[–] Matty_r@programming.dev 38 points 2 years ago (3 children)

Excellent - how many trees can I grow on my roof? Can they be retrofitted?

/s

[–] 0ddysseus@lemmy.world 6 points 2 years ago (1 children)

Trees? Not many. Grasses, herbs, wildflowers, and shrubs? Tons of them. And you can pretty easily retrofit over an existing sloped roof. And the weight is no more than a tiled roof.

[–] Kusimulkku@lemm.ee 2 points 2 years ago (1 children)

Wetness could pose a problem to the structure

[–] 0ddysseus@lemmy.world 6 points 2 years ago (1 children)

Not if you use a waterproof base layer. This isn't some theoretical thing, its tried and tested technology in common use

[–] Kusimulkku@lemm.ee 0 points 2 years ago (1 children)

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.

[–] 0ddysseus@lemmy.world 1 points 2 years ago (1 children)

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.

[–] Kusimulkku@lemm.ee 1 points 2 years ago

I'm a construction engineer, though I think that's just civil engineer in lot of the world.

BTW - flat roofs aren't a thing. Expect in traditional building in desert areas. "Flat" roofs aren't flat.

I assumed everyone knew what I meant. See some apartment building roofs.

[–] ILikeBoobies@lemmy.ca 1 points 2 years ago* (last edited 2 years ago)

Kind of

There are eco apartments (planning idk about practice); grass on the roof and trees growing up the side

Lakehead University Orillia was going to do this for a new building but I don’t know what happened