Thanks Chris and Rob for your initial thoughts.
Some additional information based on your questions:
1. We are in Denver. Mass amounts of rain are rather infrequent, so flooding the sedum beds with the occasional rocky mountain downpour shouldn’t be an issue as far as excess water content is concerned. We are more worried about it drying out than remaining too wet.
2. The deck is south and west facing. Sun exposure for the sedum won’t be an issue either.
3. We are planning a typical 4″ soil installation with an added moisture mat for additional moisture retention. We are counting more on the complete green roof system for water quality as opposed to just the vegetation, before the water hits the inlet that will take it down to grade.
4. We are not counting on a high amount of detention to happen on the green roof just that first flush filter and a little added slowdown. The outlets at grade will be ultimately connected to a subsurface vault detention system.
5. There will be supplemental drip irrigation with a moisture sensor in the soil. The hope is that that moisture mat and cup system will aid in giving us the ability to irrigate on a less frequent basis.
6. This is a new building so we are working side by side with our structural guys to make sure everything is properly supported.
Chris, are you refering to the “Basal” irrigation? It was in the June ’08 LAM.
