While research scientists are eagerly trying to find ways to realistically assess the real value of green roofs for water retention, there is a broad consensus that the current models are insufficient. (rooflitesoil.com)
5.1 This guide addresses performance characteristics for green roof systems with respect to the planting. (astm.org)
As with green roofs, blue roofs need to be inspected by an architect to ensure that the building can hold up the weight of the water. (treehugger.com)