6 votes
Accepted

What depth of soil is required for a roof top garden?

TLDR; it depends on what you want to grow, but generally speaking a depth of 20-25 cm (8-10 inches) suffices to grow many vegetables and herbes, but do investigate if your roof supports such a weight ...
  • 14.2k
6 votes
Accepted

Are green roofs more sustainable than roofs with photo voltaic?

The two are not mutually exclusive, and in fact installing PV panels over a green roof improves PV performance anywhere from 1 to 10% due to the cooling effect of the green roof. From the presentation ...
  • 11.4k
6 votes

How much temperature reduction will I get from a green grass-covered roof?

Green roofs help reduce heat significantly. For example in this study Mean daily temperature reductions achieved were 18.0 °C at the soil surface and 27.5 °C below the module and this EPA study ...
  • 14.2k
2 votes

Best vegetables for roof top garden?

I'd go for a quick green leafy crop, silverbeet, kale or spinach in the winter, lettuce or rocket in the summer. Those are all shallow rooted and will recover from being too hot and dry for a day if ...
  • 1,297
1 vote

Are green roofs more sustainable than roofs with photo voltaic?

I would put these two things in separate categories of sustainable technology. Green roofs are sustainable in the sense that the provide extra insulation and the building the cover will require less ...
  • 53
1 vote

What depth of soil is required for a roof top garden?

Consider less typical methods of gardening. Some examples: Strawberries can be grown in rows using suspended plastic rain gutters, either filled with soil (with appropriate drainage) or ...
  • 161

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