Zerofootprint, in conjunction with the UN-Habitat, announced the winners of the 2010 ZEROprize Re-Skinning Awards for energy-efficient building retrofits, recognizing projects in five categories. As a whole, the Re-Skinning Awards recognize retrofitting and reskinning technologies that improve the energy efficiency, water performance, and livability of existing buildings. The competition is open to architects, engineers, developers, and building owners either individually or in teams.

The overall competition winner is 355 Eleventh in San Francisco, designed by Aidlin Darling Architects. The project, which was featured in Eco-Structure's July/August 2009 issue, refurbished an historic, early 20th-century industrial building to achieve LEED Gold certification. A corrugated skin replaced the building's original steel classing and the the new double-skin facade operates as a screen for sunlight and air. Behind the screen, new, operable windows allow building occupants to control airflow. The project also was selected as the small/medium commercial category winner.

The large commercial category winner is Sparkasse Vorderpfaz in Ludwigshafen, Germany, originally designed by Egon Weib in 1974 and retrofitted by Thiemo Ebbert in 2009. The building, a regional bank in Ludwigshafen, Germany, improved its energy performnce by 64 percent through its retrofit. The project included refurbishing the facade to remove original ventilated classing, remodeling the base szone, and adding secondary glazing to the buidling's tower.

The large residential category winner is GESOBAU AG in Berlin, originally designed by Oswald Mathias Ungers in 1964 and retrofitted by DAHM Architekten + Ingenieure in 2008. The first 538 apartments of a total 15,000 residential units in GESOBAU AG were retrofitted in 2008, and all units will be modernized by 2015. Included in this first phase of work, the buildings in the complex were reskinned to enhance energy conservation and heating and hot water systems were updated to be more efficiency. The project upgrades also included educating tenants on how to best operate their apartments for optimum energy conservation

The small residential category winner is the Now House in Toronto, Ontario, retrofitted by Work Worth Doing Studio & Lorraine Gauthier in 2008-2009. The Now House showcases a retrofitting process that helps existing homes to become net zero energy homes by renewing or upgrading foundation walls, basement floors, roofs, exterior walls, windows, electrical systems, lighting, HVAC, ventilation, and water heating. The first applicaiton of the process was to a 60-year-old house in Toronto and resulted in energy savings of approximately 70 percent per year. The process has since been duplicated in five similar homes in Windsor, Ontario.

The final category winner, for the future of reskinning category is the Sydney Tower in Sydney, Australia, from Laboratory for Visionary Architecture (LAVA). The firm proposed reskinning the University of Technology Sydney tower, a brutalist-style high-rise, using a translucent cocoon to create a micro-climate. The new skin would generate energy through embedded photovoltaic cells, and also would collect rain water and improve daylight distribution. The plan also proposes using convective energy t opower the building's ventilation requirements.

This year's winners were chosen by a jury comprised of Thomas Auer, partner and managing director of Transsolar Energy Design Consultancy; Andrew Bowerbank, president, EC3 Initiative; George Baird, dean of architecture, landscape and design at the University of Toronto; Stefan Behnisch, principal, Behnisch Architekten; Fiona Cousins, principal at ARUP; Judith DiMaio,  dean of the school of architecture and design at New York Institute of Technology; Rick Hujibregts, director of real estate solutions, emerging markets, Cisco; Edward Mazria, founder, Architecture 2030; and William McDonough, founding partner, William McDonough + Partners.

The 2010 winners will be showcased in a traveling exhibition. For more information, visit zerofootprint.net.