Do these calculations early in the design stage so that the owner and MEP can get a sense of what overall energy consumption will be and whether this LEED credit is achievable.
Develop a draft layout and identify potential fixtures. Even if the fixtures have not been finalized, develop calculations (see below) for the lighting power allowance and installed lighting power for the project to achieve at least a 15% reduction from the allowance. This provides a realistic target for your lighting designer to work toward.
Some municipalities, like New York and Chicago, offer incentives in the form of tax credits, rebates, and density bonuses for building green roofs. Check with your municipality for incentive opportunities.
Although green roofs cost more than conventional roofs, a green roof can have a favorable life-cycle cost by increasing the life of the roof system below via sun protection. Their energy savings can also contribute to long-term financial benefits.
