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Nom du fichier: GreenRoof66007_23.pdf
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Roof types A typical Optigreen roof comprises three essential elements: (1) a drainage layer, (2) a filter layer, and (3) a growing medium/ vegetation layer or greening. There are two basic types of greening: Extensive and Intensive, with variations to suit different requirements. Optigreen Extensive roofs are lightweight with a relatively shallow growing medium, economical, require minimal care with low maintenance plants (eg, sedum, herbs and grasses), and are accessed for routine maintenance only. Optigreen Intensive roofs have a greater depth of growing medium and can support a wider variety of planting, including shrubs and small trees. Roof gardens and public spaces can be created, even vehicular areas. Optigreen Extensive systems I Economical roofs – a low cost option with a relatively lightweight system build-up. I Nature or biodiverse roofs – with a wide range of local plant species to encourage bees, butterflies, etc. I Pitched roofs – a perfect system for greening roofs with a pitch of up to 45°. I Lightweight roofs – low system build-up depth. 3 2 1 I Brown roofs – with a shallow growing medium, suitable for selfseeding and planting. Optigreen Intensive systems I Garden and landscape roofs – provide leisure and recreational space for building occupants, with shrub beds, bushes, lawns, water features, seating areas, etc. Complete roof landscapes can be designed. I Public roofs – variants suitable for pedestrian and vehicular access. Paths, pedestrian plazas and other forms of hard landscaping can be planned in tandem with roof planting. Public roofs can also be designed to combine roof greening with roads and vehicle parking areas.

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