John Seaver wrote:greetings all!
i would like to retro fit my 1800's barn with a living roof.... is this possible, my concern is the weight of soil and plants. has anyone done this?
You need to give WAY more details. Rafter material, spacing, roof deck material, roof pitch, amount of rainfall, etc.
I have seen very few barns that could take that kind of load or had a roof pitch that really would work. Most are better served being guttered for rainwater harvesting.
Growing up, the neighbor built a rainwater catchment off his barn (UNHEARD of in that day) and then pumped it up to the roof and ran soaker hose over the peak. Running the water over the roof made the animals MUCH more comfortable during the summer.
Loads of various green roof systems:
*Sedum blanket [20mm] 55 kg/m2
*Sedum blanket [40mm] 80-90 kg/m2
*Substrate based system [80mm] 120 kg/m2
*Substrate based system [100-120mm] 140-170 kg/m2
*These are ball park figures based on commercial systems
That'll be wet weight. Dusty Gedge has started recommending a substrate depth of 160mm where possible or, even better, a substrate of varying depths in order to create a more diverse range of habitats. You'd obviously have to determine what load your barn could take and work from there. Might need a structural engineer I guess. Plants are a bit easier, especially on a roof with a deeper substrate - the deeper the substrate the more stuff will survive up there.
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