Green Roof Soil Depth Lawn

Designers have the ability to create large lawn areas on rooftops using a garden roof lawn assembly.

Green roof soil depth lawn.

A variety of plants that grow well in a soil depth of five to seven inches are good to use including certain perennials ornamental grasses herbs shrubs and sedums. It is generally not recommended for hot climates. Vegetables are the other main group of annual plants used on green roofs. It is also important to factor in the type and lifetime of the roof membranethat will be used.

Rooftop lawns are semi intensive green roofs with a total depth of at least 8 inches. This green roof can be described as a combination of an extensive and intensive roof and therefore is also called a hybrid roof. Or more depending on the depth of the soil. The garden roof lawn assembly is considered a lightweight assembly but with a slightly deeper soil depth and is designed to support sod lawns as well as perennials.

Garden roof assembly hydrotech s garden roof assemblies combine the proven performance of our monolithic membrane 6125 roofing waterproofing with proven green technology. Green roofs with turf are lush usable spaces. Whether your planting bed is in the lawn green roof or a planter proper drainage is crucial. This rooflite soil system supports lawn grasses that require deeper root space and thrive on a soil with plenty of finer particles and the precise amount of organic matter.

Replacing the impervious surface of a conventional roof with. Typical engineered soils layered 6 inches deep are 70 percent inorganic materials such as perlite lava rock and vermiculite and 30 percent organic material such as compost. Planting areas with restricted soil depth or restricted soil volume are notoriously prone to drying out quickly but don t be fooled into thinking you don t need to address drainage. Its soil depth is a full 2 inches enough to support many low growing succulents and a limited number of accent plants.

While installation of a green roof is initially more expensive than a conventional roof a green roof has a much longer life span than a conventional roof. These require irrigation and a substrate depth of at least 200 mm. The lite system is typically used on retrofit projects when the roof is engineered with only 15 to 17 pounds per sf for the green roof component. The existing roof must be reinforced to carry the additional weight load anywhere from 15 30 lbs sq.

The structural engineer must factor in the weight of completely saturated soil since the plantings and the soil will hold a significant amount of water. Lawns have unique needs due to the foot traffic they experience. Unlike conventional earth covered structures garden roof assemblies are lightweight and can be installed on a wide variety of new and existing structures.