In 2012, New York City’s Zone Green program amended the Zoning Code to allow wall thickness to be deducted from floor area provided the walls are energy efficient. City Planning claims New York buildings are responsible for 80 percent of the city’s carbon emissions. This floor area deduction gives both older and newer buildings an opportunity to insulate their walls and save on energy costs.
Zoning computes floor area from the outside of the building’s edge, encompassing the entire thickness of the wall. (more...)