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Don’t some green building designers already use double-skin exteriors?



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Positive Development From Vicious Circles to V

Don’t some green building designers already use double-skin exteriors?
Conventional double-skin buildings only address heating and cooling needs. They also create 
ecologically ‘negative’ spaces between the glazed surfaces. They increase the urban heat sink. Also, 
curtain glass is hard to repair. Green Scaffolding, in contrast, can increase building longevity by 
providing weather or earthquake reinforcement, reducing impacts of flooding, terrorist attacks and 
strong winds. If properly designed, it could also reduce the risks of some building parts being 
dislodged during strong storms, or of tree limbs damaging the core structure (a problem that often 
causes native tree removal in Australia as they are inclined to drop limbs). They also create ecologically 
useful (as opposed to dead) spaces. Electronic sensors can regulate environmental controls like shade 
cloths and reflectors to increase or decrease light and heat as required by plants in side the skins. We 
have horticultural science that can design seedless watermelons, fartless beans and square tomatoes.
If they can design plants to suit the convenience of industry, doubtless they can also guide the design 
of suitable urban environments for plants and even protein. In some countries, people eat guinea 
pigs among many other small sources of protein. One could even grow small, relatively happy 
animals, fish and poultry in parts of the building envelope [Figure 10].
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There are now urban farm 
structures that have whole floors allocated to animals as well as plants.
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Urban community farms 
are also mushrooming in many places. However, we should distinguish nature ‘as food’ from nature 
‘as ecology’.
What is appropriate for buildings where we want to preserve the façade?
The external façade of historic buildings can be preserved by internal Green Scaffolding. Space frames 
of steel and cable can reinforce masonry buildings and reduce the potential damage from earthquakes 
or structural deterioration [Figure 4]. Some older buildings would not survive otherwise, as they 
would cost too much to maintain, heat and air-condition, and so on. Internal Green Scaffolding 
can generate natural air-conditioning and insulation, as does the exterior Green Scaffolding. In 
winter, these structures could trap warm air between the exterior glazed skin and the original wall.
In summer, warm air could be exhausted out using wind syphoning or solar chimneys, where hot air 
rises and pressure differentials move air. Therefore, Green Scaffolding can be used as: 

Walls for new buildings 
• 
To retrofit old exterior walls
• 
To increase the longevity and use of heritage buildings
• 
As free standing green space frames in parks and other public spaces to create semi-indoor
spaces and nature habitats
All of the above structures can serve multiple human and ecological functions. For example, large 
space frames defining a public plaza could also be combined with sprays of recirculated water to cool 
the urban area in heat waves. While there are few on-ground examples, the MFO Park in Zurich 
provides a limited forerunner of what is possible. 


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The Case for Eco-retrofitting
Figure 4 Eco-retrofitting historic buildings
In the case of an older building in 
need of renovation and structural 
reinforcement, we can add a vertical 
landscape to the interior while 
reinforcing the old structure with 
an internal scaffold. In this example, 
to improve natural air circulation
natural light and air quality, an 
interior atrium is created. This 
creates a U-shaped interior where 
air is drawn from the office spaces 
and out through a new solar stack.
The section shows light from a new 
roof skylight directed into the atrium.
The light bounces off a suspended 
shiny pipe sculpture, which we will 
call a ‘green chandelier’. The pipes 
that are further from the skylight 
bounce light down to the lower 
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