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Recommended Weight Allowances for a Sustainable and Bio-diverse Living Roof.
 

At Oxford Green Roofs Ltd we always follow the Green Roof  Organisation's Code of Best Practice (click on green button to view) which gives a clear indication and explanation of depth of substrate required for a fully sustainable and bio-diverse green roof. 
 

Over the years we have gained experience in the best substrate depths that support a variety of planting schemes and our advised weights are a result of this experience. 
 

The following are the minimum weight allowances that we recommend.

Sedum – 130kg/m2
Wildflower meadow – 220kg/m2
A roof with extra aggregate and wildlife habitat - 350kg/m2
 
If you are unsure what kind of planting you would like then allowing for 220kg/m2 will give a considerable amount of choice. 

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