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OT - Green Roof 17-Mar-2015 At 11:41:22 AM startedwithtrees

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Thanks Guys. You're all correct - topsoil is very heavy, especially when saturated!

Apparently green roofs tend to use lightweight growing mediums e.g. vermiculite mixes, which bring down the weight . A landscape architect is advising on growing mediums, plants and resulting weight m/2 for a shallow green roof, as well as the layers required e.g. waterproofing, root protection barriers, drainage layers etc. Her brief phone advice was that for 30 mm depth additional weight would be around 100kg/m mark (TBC).

However, we'll need a structural engineer to calculate the weights based on the LA's advice, and work out what additional reinforcement the garage would need. We haven't built it yet, so hoping its easier to build strong enough rather than retrofitting. A bit unusual, so guess it would be best to hire an engineer with at least an interest in the area, if no direct experience. Was hoping some of the engineers on chokky might fit the bill or know someone... given we tend to enjoy the outdoors more than some!