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?

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Trista Brown

Project Director

WSP USA

LEEDuser Basic Member

381 thumbs up

Sat, 09/08/2018 - 00:12

Hi Cathal, there's no roof depth requirement for v4 - an intensive or extensive roof can achieve the credit. I don't believe the roof soil needs to comply with Table 2 since really it should be specially designed to support the plant species selected for the roof. I'd be curious if anyone's confirmed this on an actual project though!

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