Category Archives: Sustainable Green Roofs

The Skycourt and Skygarden by Jason Pomeroy – book review by Tom Turner

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We are seeing the approach of a new architectural style. Let's call it GHA.

Are we seeing the approach of a new architectural style? If so, let’s call it GHA.

Jason Pomeroy The Skycourt and Skygarden: Greening the urban habitat Routledge 2013 ISBN-13: 978-0415636995
Jason Pomeroy studied architecture in England and now leads a design studio in Singapore. He has a special interst in above-ground greenspace and Singapore is a world-leading city in this respect: it is rich; it is very well run; it sees itself as a Garden City.
Over half the book is a really useful set of case studies, wisely categorized as Completed, Under Construction and On the Drawing Board. I am as full of admiration for the architects and clients who launched these projects as for the author who assembled and analyzed the details. Some, like the Marina Bay Sands Hotel in Singapore, look as good as the design drawings promised. Others show lush vegetation on the drawings and less vegetation on the photographs. The plants may grow – or they may be removed, because much of it is on balconies and residents like glazing such spaces to create extra indoor accommodation. This is common practice in China, South Korea and elsewhere.
The author’s definitions on page 41 are:

  • Rooftop garden: ‘a landscaped environment built on the roof’
  • Skygarden: ‘an open or enclosed landscaped open space that can be dispersed through the higher levels of the urban habitat or tall building’
  • Skycourt: an enclosure ‘created by the void space being bordered by other buildings within the immediate urban context, or formed by its own internal facades’.

One can hardly expect satisfactory names and definitions for a new spatial typology – and I am unhappy with the above definitions. They use the verb ‘landscaped’ to mean ‘planted’, which is incorrect, while the author makes no reference to the involvement of landscape architects with the design of above-ground space. It is not enough for a space to be planted: each space should be well-planned and well-designed to fit its intended social use. Some of the spaces described as skycourts are what I would call balconies. Others are fashionably weird bites taken out of buildings which have many floors below and many above. In London, spaces like this are cold, windswept and unpleasant. In Madrid’s hot summers the Mirador ‘skycourt’ may be pleasant; in its cold winters the bites must be grim. In Singapore’s hot sticky climate the bites may be shady, breezy and delightful. But they will also require artificial irrigation. One needs to be skeptical about ‘green’ buildings: they can be ‘green’ in the sense of ‘vegetated’ without being ‘green’ in the sense of ‘sustainable’ – like Patrick Blanc’s green living walls. The design of every building should respond to the genius of every place.
In the absence of good evidence we should have no more trust in architects’ claims for buildings being sustainable than we have in politicians who describe their policies as ‘sustainable’. The technical term for both is ‘greenwash‘. For some of the Future Vision projects in Chapter 2 (see examples above) the technical term is ‘hogwash’. This is Greenwash-Hogwash Architecture (GHA)and I wish Pomeroy had been more critical of it. We are not going to get good green buildings (‘landscape architecture’, as we might call it) without thoughtful analysis of what is good and what is bad and what is awful.

The analytical aspects of Pomeroy's book on Skycourts and Skygardens are commendable

The analytical aspects of Pomeroy’s book on Skycourts and Skygardens are commendable


Two real strength of Pomeroy’s book are his analytical diagrams and his systematic charting of the characteristics of above ground greenspace. City planners and urban designers should certainly be analytical and everyone who wants greener cities must read page 69. I won’t spill the details but it explains the legislative and financial principle which has encouraged Singapore’s architects to go green. It’s wonderful.

London can become a Roof Garden City – but it needs imaginative design as well as town planning

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Ebenezer Howard proposed garden cities outside London. That’s fine but Central London should adopt the landscape policy of becoming a Roof Garden City. Property developers should be rewarded for providing green roof gardens and punished on those few occasions when they find reasons for not providing roof gardens and sustainable green roofs on new buildings. Visually, this is the single most important policy for making London a Green Roof City. As everyone knows, London is already the world’s Garden Capital. Now it should become the world’s Roof Garden Capital.
But I doubt if it will. British town planners are far too unimaginative – and Singapore’s planners are way out in front. As I ride my bike around London I often think ‘Why does the RTPI exist? What, in heaven’s name, do town planners DO? Why not dissolve the Royal Town Planning Institute?’ The answer, I think, is that most of their effort goes into a sometimes-useful attempt to stop landowners doing what they want to do. UK planners seem to have no positive achievements – except, perhaps, in helping developers evade planning restrictions dreamed up by their professional colleagues.
Thomas Mawson published an attractive book on Civic Art in 1911 and became a founder member of what is now the Royal Town Planning Institute in 1914. Then, in 1929, he became first president of what is now the Landscape Institute. Perhaps we need an agreed division of labour between the two professional institutes: the RTPI can stop developers from doing bad things and the Landscape Institute can encourage them to do good things.

Roof SkyPark garden-landscape on Marina Bay Sands Hotel in Singapore

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Roof garden swimming pool in Marina Bay Sands Skypark

Having proposed a Sky Park for the City of London, I was delighted to see a real Skypark on the Marina Bay Sands Hotel. ‘London talks and Singapore acts’. The Marina Bay Sands Hotel has 2,561 rooms and 55 floors. The SkyPark, 200m above ground level, is larger than three football pitches and has an observation deck, 250 trees and a 150m infinity swimming pool. It is a brilliant project by Las Vegas Sands and, I hope, a signpost to the future of urban form. See the Marina Bay Sands website for more details. I’d like to spend a few nights there, congratulating the hotel management for commissioning the project and then the city of Singpore for its policy of moving from ‘Garden City to Model Green City‘. But a design critic must also provide criticism:

  • the garden/landscape design looks ‘OK but dull’. The designers have not risen to the challenge of such a fabulous opportunity, perhaps to re-create some of the rain forest of pre-colonial Singapore with stylised beaches running to the perimeter pool. I wouldn’t even object to a glowing Tarzan by Jeff Koons in the heart of the jungle – and nor would the kids of the guests.
  • As built, SkyPark floats somewhere between the deck of a luxury cruise ship and the garden of a luxury hotel – and both are design categories which landscape designers neglect. What the SkyPark needed was a serious dreamland design to lift the imagination of guests, as well as the contents of their wallets. Moshe Safdie was the architect. He worked with five artists but, having written a book For everyone a garden probably sees himself as an expert on garden design. I do not doubt that, like Frank Lloyd Wright, Safdie has the ability to design gardens but as with all the arts, it takes time to develop expertise and one needs to love garden life and garden visiting to succeed. My belief is that Edwin Lutyens’ best gardens were designed in co-operation with Gertrude Jekyll and that Lutyens tended towards vacant formalism when working, like Safdie, on his own. Eero Saarinen had the great good sense to work with Dan Kiley.
  • the Tropical Island shape of the SkyPark sits unhappily on its three towers. There is a dash of HG Wells’ War of the Worlds about it. Or an out-or-water oil rig. Looking up, one wonders if a Tsunami left a cruiseliner or a surfboard perched on the roofs of its three towers. The resort hotel may appear more sensitive to its context when more of Singapore’s buildings have SkyParks
  • Safdie’s urban design, which I commend but which is not apparent from the photographs, was as follows: ‘A series of layered gardens provide ample green space throughout Marina Bay Sands, extending the tropical garden landscape from Marina City Park towards the Bayfront. The landscape network reinforces urban connections with the resort’s surroundings and every level of the district has green space that is accessible to the public. Generous pedestrian streets open to tropical plantings and water views. Half of the roofs of the hotel, convention center, shopping mall, and casino complex are planted with trees and gardens.

Top photographs courtesy Marina Bay Sands Hotel. Bottom photo courtesy Peter Morgan.

 

 

Roof garden structure for Marina Sands Hotel Skypark

 

 

 

Kongjian Yu – landscape architecture as an art of survival

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I have praised Kongjian Yu’s work before and much enjoyed his lecture to the HGSD (above). I particularly like his advice to ‘make friends with the flood’ and to design for the ‘integration of contemporary art and ecology’. But I am having doubts about my call for him to be appointed Chief Technical Officer to the The Ministry of Housing and Urban-Rural Development 住房和城乡建设部. For sure, he would be very good at the job – but the landscape architecture profession has greater need of him.
It is bad mannered of me to criticise Kongjian after he quotes me in his lecture, but there are two historical points I would like to correct. First, the history of landscape architecture in east and west can be traced back for thousands of years – though its name is but 185 years old. Second, the planning of western gardens and parks ‘for ornament’ dates from c1700 and is now in decline. Older parks and gardens were always planted for food.
So here is an invitation: next time Kongjian Yu is in London I would be delighted to show him round my local park and the new building for the University of Greenwich Department of Landscape Architecture. Greenwich Park was designed in 1660 primarily for food production – and it still produces a large quantity of food, much of which is collected by ethnic Chinese. So it is very appropriate that the roof of the new school has the production of food as one of its main design aims: it will be used for research into the use of living roofs for food production and other sustainable purposes.

MOER Green roofs: history, classification and naming

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Scandinavian Green Roof Institute at Malmo

Scandinavian Green Roof Institute at Malmo

This blog has often discussed green roofs and green roof typologies but they always need more consideration:

Green roofs c3500BC

Turf was the standard roofing material in Neolithic North Europe. You can still see this roofing technique in Norway and Iceland

Roof garden c1000BC

The most famous elevated garden in history, the Hanging Gardens of Babylon, may not have been on a roof. Nothing is known about the construction and they may have been ‘hanging’ on an embankment rather then a roof. But they were definitely used as a garden and the only illustration of this type of space is a carved tablet in the British Museum. This was a place for fruits and flowers and a place to walk in the cool of the evening

Roof gardens in the twentieth century

Cities were becoming much denser and much higher-rise, so people began making modern roof gardens. Corbusier proposed one in Paris and the landscape architect, Ralph Hancock, designed one for Derry and Toms, now called the Kensington Roof Garden

Green roofs in the twentieth century

People began to remember that ‘green stuff’ could also serve as a roof-covering material and then found many reasons for reviving the idea: water conservation, biodiversity, acoustics, insulation etc. This led to the making of what are called ‘extensive’ green roofs and, by way of contrast, roof ‘gardens’ came to be called ‘extensive’ green roofs. I think the terminology began in Germany.

Moer Roofs in the twenty-first century

The City of Malmö and the Scandinavian Green Roof institute established a 9000m3 green roof which is called the Augustenborg Botanical Roof Garden. It is a good project and, though the name suggests ‘a botanical garden on a roof’, the design objectives of the Malmö roof are broad: ‘environmental, economical, and to improve storm water management, health and aesthetics in our communities’. This type of roof needs a new name and we could base it on MOER technology: Multi-Objective Environmental Roofing (pronounced as ‘mower’, for irony). The roles of a broad spectrum Moer Roof would include: social use, aesthetic use, food production use (including aquaponics), water conservation, biodiversity, acoustics, insulation, energy generation, sustainability etc. The SGRA has a useful classification of green roof advantages and design objectives
Image courtesy i-sustain

Bosco Verticale – vertical forest garden balconies in Milan

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Green walls and green roof makes a forest appartment block in Milan

Congratulations to Stefano Boerion his Vertical Forest. He proclaims: ‘The first example of a Bosco Verticale composed of two residential towers of 110 and 76 meters height, will be realized in the centre of Milan, on the edge of the Isola neighbourhood, and will host 900 trees (each measuring 3, 6 or 9 m tall) apart from a wide range of shrubs and floral plants. On flat land, each Bosco Verticale equals, in amount of trees, an area equal to 10.000 sqm of forest. In terms of urban densification the equivalent of an area of single family dwellings of nearly 50.000 sqm.’
But will it work? I do not anticipate a horticultural problem with growing the trees. But will the residents want them? I am sceptical. A planted balcony with shrubs, flowers and living space is a delight. But there is a long history of residents not wanting large trees too near the windows of their houses. Trees keep out the sun and block views. The trees on top of the building should be a great success – providing the structural, horticultural and stability issues have been properly addressed.