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Coworth Spa – M&J Flat Roofing Ltd with Alumasc Exterior Building Products GRO-ing with the times
By Ian Henning, technical manager for the National Federation of Roofing Contractors (NFRC).
Green roof technology is becoming increas-
ingly used in the built environment for a number of wide ranging benefits. Green roofs work all year round, reducing heat gain during summer months and providing insulation to keep heat in during the winter. In London and Sheffield there are now distinct
Goats on the Roof – Redhead Roofing with IKO plc
policies in place to increase the uptake of green roofs. For instance Sheffield City Council, in par- ticular the local Green Roof Centre, is keen to create a number of model green roof situations in and around the city to demonstrate their benefits to all developers across all building types. Therefore, there is a need for guide- lines to help consultants, specifiers, suppliers, installers and the building owners to understand what green roofs are and why and how they should be installed and maintained. While green roofs in
Little Venice – LCE Architects, Accurate Roofing (UK) Ltd with Bauder
growth areas: solar and green. Solar given impe- tus by last year’s Feed in Tariffs and the Green Roofing driven, largely, by ecological and aes- thetic considerations. Green roofs, vegetated or living roofs comprise
U
of vegetation and a growing medium installed and planted over a waterproof membrane. All are usu- ally designed as a system and then installed by specialist trained roofing contractors.
nlike most sectors in the UK construction industry and in particular roofing in the past few years there has been two
the UK are a relatively recent introduction, in many parts of North America there are in some cities planning incentives for the greater use of green roofs. In Japan – Tokyo in particular – it’s widely accepted that they deliver positive cost- savings for building occupiers and they substan- tially reduce greenhouse gas emissions. In Europe, particularly Germany and Switzerland,
vegetated roofs have a long and successful track record, therefore up to now it has been natural for British companies to refer to the German FFL guidelines for their design and installation rules. The FLL Forschungsgesellschaft Landschaftsen-
twicklung Landschaftbau’s (Landscape Research, Development and Construction Society) guidelines for the planning, execution and upkeep of green roof sites is often quoted worldwide as the bible when designing vegetated roofs. However, it was
recognised by the Green Roof Organisation (GRO), an independent body representing the industry Trade Associations and the key players in the Green Roof Market, that FFL was not always appropriate to our environment and construction traditions. For these reasons GRO has recently written
the Green Roof Code or Code of Practice, which provides the basic rules for anyone designing, specifying, installing and maintaining Green Roofs in the UK. The Code outlines three broad classifications
‘Green roofs substantially reduce greenhouse gas emissions’
of green roofs together with bio diverse types and their benefits of sustainable drainage, building performance enhancements, countering climate change, biodiversity and amenity, and health well- being, as well as financial advantages. It details the fundamental design and practical implications for these roofs and intro- duces the different components in a green roof build-up, highlight- ing their function and
important performance characteristics. Key green roof design issues are subsequently highlighted. The code describes how roofs should be
constructed and maintained and guides contrac- tors as to their training requirements and installa- tion procedures. Finally, it lists the relevant British and European standards for materials and work- manship as well as the all important FFL guide. The code may be freely downloaded from
LivingRoofs Org Ltd., the Green Roof Centre and from GRO members directly such as the National Federation of Roofing Contractors (NFRC). While the document provides the basic param-
eters of design and requirements, each GRO member will produce different system materials and it is suggested they should be contacted directly for detailed guidance.
enq. 216
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