Green Roof Soil Depth Lawn

Lawns have unique needs due to the foot traffic they experience.

Green roof soil depth lawn.

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. Designers have the ability to create large lawn areas on rooftops using a garden roof lawn assembly. 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. Rooftop lawns are semi intensive green roofs with a total depth of at least 8 inches.

Whether your planting bed is in the lawn green roof or a planter proper drainage is crucial. Green roofs with turf are lush usable spaces. Or more depending on the depth of the soil. The existing roof must be reinforced to carry the additional weight load anywhere from 15 30 lbs sq.

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. Unlike conventional earth covered structures garden roof assemblies are lightweight and can be installed on a wide variety of new and existing structures. Careful plant selection and maintenance is needed to ensure annuals do not become weeds on a green roof. 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. 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. Vegetables are the other main group of annual plants used on green roofs. Garden roof assembly hydrotech s garden roof assemblies combine the proven performance of our monolithic membrane 6125 roofing waterproofing with proven green technology.

Replacing the impervious surface of a conventional roof with. This green roof can be described as a combination of an extensive and intensive roof and therefore is also called a hybrid roof. 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. This is especially true of intensive green roofs which can have soil that is two feet deep or more.

It is also important to factor in the type and lifetime of the roof membranethat will be used. 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. These require irrigation and a substrate depth of at least 200 mm.