DC: Green Roof Tool Kit

GREEN ROOF TOOLKIT GREEN ROOF OVERVIEW There are three types of green roofs: extensive, semi-intensive and intensive. Although the design will differ, the basic layers remain the same. Green Roof Types Extensive 3 - 4” of growing medium 15 - 30 pounds per... More

GREEN ROOF TOOLKIT GREEN ROOF OVERVIEW There are three types of green roofs: extensive, semi-intensive and intensive. Although the design will differ, the basic layers remain the same. Green Roof Types Extensive 3 - 4” of growing medium 15 - 30 pounds per square foot (additional roof load) less variety of plants | usually Sedum requires little irrigation| drought resistant low maintenance costs about $10. 00 to $30. 00 per square foot (above the cost of a conventional roof) few design elements Semi - intensive 4 - 8” of growing medium 25 - 50 pounds per square foot (additional roof load) more plant variety | wildflowers, drought-tolerant herbacious perennials requires periodic irrigation periodic maintenance costs about $20. 00 - $40. 00 per square foot (above the cost of a conventional roof) incorporates design elements Intensive 8 - 12” of growing medium 40 - 150+ pounds per square foot (additional roof load) high variety of plants | includes shrubs and trees requires consistant ir Less