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Blackdown Greenroofs Herbaceous Perennial

Substrate Installation

The choice of lifting substrate up to the roof level and subsequent dispersion of it across the roof has significant budgetary and scheduling implications. Blackdown assesses each project’s specific conditions (i.e. roof area, slope, structure, access, plant equipment availability etc) to determine the most time- and cost-efficient installation method, selecting from: Bags: 1.25 m3 bulk…
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Blackdown Greenroofs Sedum Acre

Plant Installation

The choice of vegetation is a function of cost, time and the requirement for instant greening. The plant layer can be installed using the following methods: NatureMat: A high quality carpet of sedum species is grown to maturity in our fields. Rolled out directly on to the substrate, NatureMat provides an instant green roof with…
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Blackdown Greenroofs Dianthus Deltoides Red

General Design Issues

Structural design criteria: Wind: The green roof build‐up must have sufficient weight to resist uplift due to wind. Erosion control measures may be required to protect the main roof area, however at the building’s perimeters where the highest loads occur, ballasting aggregates or paving slabs are installed. Dead loads: The saturated weight of the green…
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Blackdown Greenroofs fields

Can a green roof’s performance be covered by a guarantee?

Yes, but as the plant layer is living and developing, its performance can only be guaranteed if a maintenance contract is taken out with Blackdown Contracting.

Blackdown Greenroofs Hanging Gardens of Babylon

Are green roofs tried & tested?

Yes. It is believed that the first green roof was built at Babylon, where it is considered to be one of the seven wonders of the Ancient World. Modern green roof systems have been in existence in Europe for over 50 years and are commonplace in Germany and other western European countries.

Blackdown Greenroofs Clay Farm

Does a green roof adversely affect performance of the waterproofing?

No, quite the reverse. Provided that the specification is appropriately formulated and detailed, green roofs can significantly extend the lifespan of the waterproofing beneath. This is due to blocking out ultra violet light, reducing thermal fluctuations, wind scour and climatic stress.

Blackdown Greenroofs containment angle

Won’t rainwater from a green roof leak into my roof?

No, a range of different roof coverings can be used to provide the requisite weather-tightness, including single ply or bitumen membranes, liquid applied waterproofing or aluminium standing seam systems.

Blackdown Greenroofs solar panels

Why not use the roof space for solar panels instead of a green roof?

The two are actually mutually beneficial. The cooling effect of green roofs can improve the efficiency of solar panels (also known as photovoltaics [PV]). The shade provided by the PV units can also enhance the biodiversity potential of the green roof. Plant species must be carefully selected to suit the partially-shaded conditions, enabling the full…
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Blackdown Greenroofs extensive roof at Material Store in London

Really? Green roofs can be a planning requirement?

Yes, green roofs are increasingly stipulated as being mandatory if planning consent is to be granted. The need for sustainable drainage has led the Environment Agency to specify that runoff from many new sites must mimic behaviour of a green field site as closely as possible. Climate change forecasts suggest that the number of such…
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Blackdown Greenroofs usk monmouthshire the bunker

Why would I want a green roof?

Apart from the aesthetic value and the strong positive statement associated with sustainable design principles, green roofs are typically specified for any one, or combination, of: Ecological or environmental benefits Building performance enhancements Financial incentives Planning requirements The nature and extent of these benefits will vary with the specific green roof construction. Extensive green roofs…
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