![]() ![]() A monolithic green roof is one where all components are placed on the roof in layers and plant roots are free to intertwine with those of adjacent plants all across the roof. There are also monolithic and modular green roofs. They function as stormwater filters and habitat for urban wildlife. ![]() Semi-intensive green roofs have moderate watering and maintenance needs and are suited for roofs that can support 25 to 40 pounds per square foot of load. They do not contain tall-growing bushes or trees. In between extensive and intensive are semi-intensive green roofs, which are grown 5 to 7 inches high with perennials, small shrubs, and ornamental grasses. They will also require a permanent irrigation system and are the most labor-intensive and expensive green roof type. Intensive green roofs require a roof with high load-bearing capacity, as they may weigh 35 to 80+ pounds per square foot. Green roofs used for rooftop farming are one example of an intensive system. Some intensive green roofs even have benches, ponds, or playgrounds built into their designs. An intensive green roof is designed to look much like a city park, with lawns, perennials, bushes, and trees. They also require greater maintenance and inputs of fertilizer and water. In contrast to extensive green roofs, intensive green roofs contain a greater variety of plant types. Extensive green roofs are also the least expensive green roof type. The weight of an extensive green roof will range from about 13 to 30 pounds per square foot. This helps extensive green roofs to be well-suited for roofs with little load bearing capacity. They are shallow and covered with low-growing grasses, herbs, or succulents. These green roofs are typically maintained at only 3 to 5 inches high and are not usually irrigated. They primarily function as an ecological protection layer, such as a filter for stormwater. They have shallow soils or other growing media that are well-suited for low-growing plants like Sedum and other succulent species. The designation depends on their depth, type of vegetative cover, and function.Įxtensive green roofs are low-maintenance. Green roofs are designated as extensive, semi-intensive, or intensive. ![]()
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