"Green roof" means a solar roof or a vegetative roof.
"Solar roof" means a solar roofing system that generates reusable energy, which reusable energy accounts for at least 2.5 percent of the total electric energy used by the building to which the solar roofing system is attached.
"Vegetative roof" means a roofing system designed in accordance with the Virginia Stormwater Management Program's standards and specifications for green roofs, as set forth in the Virginia Stormwater BMP Clearinghouse, in which at least 50 percent of the total roofing area is vegetative.
Va. Code § 58.1-3852