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Greenhouse, Leeds by West and Machell Architects

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[Images + project data] Insulation has helped this pioneering mixed-use refurbishment to achieve a 60 per cent increase in overall energy efficiency, using high specification insulation and the latest renewable energy technology

The seven-storey development has been refurbished and extended to provide 172 one, two and three-bedroom eco-apartments, plus office space, transforming the original 1930s Art Deco brick-and-concrete former workers’ hostel.

Compared to a standard approach, it is expected to save 169 tonnes of carbon and 3.8m litres of water each year and it has achieved Level 4 of the Code for Sustainable Homes.

The thermal performance of all building elements has been considered to create an airtight building envelope with the following U-values: walls, 0.15; windows, 1.32; roof, 0.1; floor, 0.15 W/m2K.

The existing building was wrapped in a new high-performance insulated skin. The new roof has now achieved a U-value of 0.10 W/m2K.

A ground source heat pump supplements heating and solar panels provide hot water. Roof wind turbines provide electricity for communal lighting and lifts and water is recycled. Residents can control their energy and CO2 emissions using the IPTV energy-monitoring system, which allows them to view utility bills and CO2 output on their televisions.
Craig Bolton, architect, West and Machell Architects

Selected products

Insulated render system
WBS External Wall Insulation Render System
incorporating 130mm Kingspan Kooltherm K5
External Wall Board Insulation
Roof insulation
Kingspan Insulation Thermataper TT47
Roof membrane
Sarnafil G410-12EL membrane. Finish light grey
Acoustic flooring to new upper timber floor
Regupol 7210C
Acoustic flooring to new concrete floor
Regupol 4515
GGBS concrete
Acoustic insulation to party walls
Isowool Glass Quilt
Floor Slab Insulation
Kingspan Thermafloor TF70+65mm screed
Acoustic Ceiling System
Lafarge Acoustic MF Ceiling System

Project data

Name of Project Greenhouse, Leeds
Client Citu
Main contractor Clegg Construction
Quantity surveyor Sum
Structural engineer Thomasons
Services engineer Woods Environmental
Procurement route Design and Build
Gross internal floor area 12,623 m2
Construction cost £12.5 million
Start on site December 2008
Completion April 2010
EstimatedannualCO2emissions for typicalflat 0.5 tonnes

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