Hi all

I am working on an existing building where the LEED boundary is the building footprint.

We want to achieve this credit via the installation of a green roof of 30% of the site area.

However I am unsure of the required green roof characteristics and depth.

For example the reference guide states than an extensive roof would work (1 to 6 inches), however I have seen 12 inches in the reference guide (Table 2) and in this forum.

Which is correct regarding depth?

Also does the green roof soil need to comply with Table 2 in the reference guide? The only language that I can see directly referencing the green roof make up is if plants are native or adapted, provide habitat, and promote biodiversity then all is good.

Have anyone had this clarified?