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Considerations before starting a green roof project:

  • Is your roof being replaced? The optimal time to add a green roof is during the replacement of your roofing membrane or in new construction.

  • Can your building support the additional roof dead loads of a minimum 21 lb/sf ?

  • Does your roof have access for construction activities and crane?

  • Can you afford $8-25+/s.f. in addition to the membrane/waterproofing?

  • Is your roof relatively flat or no more than 30 degrees? A slope of more than 2% will require additional structure/cost to hold the media in place.

  • Consider how you want to use the space which will impact the overall design/thickness of soil/loading and plant selection.