SAT Reading & Writing Question of the Day

Buildings with green roofs host more pollinators and exhibit cooler rooftop surfaces than adjacent black roofs.

In controlled summer tests holding insulation constant, irrigated green roofs cut cooling energy use by 18% relative to gravel roofs, while replacing vegetation with inert insulation of the same R-value yields no comparable reduction.

During winter, heavily insulated conventional roofs reduce heating demand more than thin green roofs.

A simulation of a single three-story library suggests that doubling green roof soil depth increases roof R-value by 10%.