LEADING UK PLANTED ROOF SUPPLIERS

Planted roofs are flat or low pitched roofs which have landscaping on top of the waterproofing layer. This may include some hard surfaces, and have access for leisure as well as the necessary routine maintenance. Planted green roofs may be waterproofed using modified-bitumen high performance built-up systems, single-ply membrane systems or mastic asphalt. Under planting, T-grade mastic asphalt should be laid to 30 mm in three layers rather than the usual two layers to 20 mm thickness. Green planted roofs improve the life of the waterproofing layer, by protecting it from physical damage, ultraviolet light, and temperature extremes.

Extensive planted roofs are lightweight, relatively cheap, and not for recreational use. Instant cover can be created by the installation of pre-cultivated vegetation blankets where the immediate visual effect is required. The complete extensive planted green roof system, with planting soil, filter sheet , drainage, moisture retention layer and root barrier, will add between 60 and 200 kg per sq metre.

Intensive planted roofs are designed to accept recreational activity. Depths of soil are typically between 200 mm and 300 mm; they add around 400 kg per sq metre to the roof load. Where trees are required, soil depths may need to be increased to typically 750 mm, with associated increase in roof load. A handrail or fall arrest system must be incorporated into the planted roof design.

DETAILED INFORMATION RESOURCES ON PLANTED ROOFS

We recommend the following websites, with building product information including manufacturers' specs, standard specifications, and CAD details: Barbour Compendium, RIBA Product Selector Plus, ASC Bricsnet, Building Products Index, British Board of Agrément, British Standards Online.

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