Tetrarch Posted August 28, 2023 Share Posted August 28, 2023 Probably need an SE to get the definitive answer. On a 3.5 x 8.5m span warm roof with multiple skylights, how much extra height would I have to sacrifice to accomodate a sedum roof? The rubber4roofs website states a value of 120kg per sq m which sounds like a lot and would equate to additional load of ~3.5 tonnes, which I am assuming would need much larger structural supporting beams Regards Tet Link to comment Share on other sites More sharing options...
Alan Ambrose Posted August 28, 2023 Share Posted August 28, 2023 I was just looking at the density of topsoil yesterday - a glamorous life eh? It's about 1.4T / m^3. Google says a sedum roof should have 70-200mm of topsoil - so 1.4 * 7% = 100 Kg / m^2 and 1.4 * 20% = 280 Kg / m^2. So, yeah - 100-280 Kg per m^2. Putting it another way, 120 Kg per m^2 is about 85mm of topsoil. My present roof (pitched tile) presents a load of ~1.6 Kn/m^2 i.e. ~160Kg/m^2. I appreciate yours is flat and probably more lightweight construction - tiles are heavy (I see they're about 1/3rd of the loading). So yeah, an extra 120Kg/m^2 sounds like it would make a sizeable difference. Link to comment Share on other sites More sharing options...
LSB Posted August 28, 2023 Share Posted August 28, 2023 do you really need heavy soil here is the make up that we are going to use It's not as heavy as soil. 1 Link to comment Share on other sites More sharing options...
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