30
EXTERIORS
Wraptite®
membrane plays key
role in Passivhaus leisure centre S
t Sidwell’s Point, in the heart of Exeter city centre, is the world’s fi rst Passivhaus- certifi ed, multi-zoned leisure centre. The
£44 million, world-leading project includes the A. Proctor Group’s Wraptite®
external air
barrier as part of the highly effi cient external wall construction.
The building was designed by Space &
Place Architects, alongside Passive House designers Gale & Snowden. On site, it was delivered by main contractor Keir. As well as Passivhaus certifi cation,
St
Sidwell’s Point was designed and constructed to Building Biology IBN best practice in Healthy Building Design, using data from the University of Exeter Climate Scientists to provide resilience against predicted climate change to 2080.
Applying the Passivhaus standard to a complex multi-zone building Leisure centres are complex buildings with different internal environmental conditions
for the
to accommodate. Carefully managing the various requirements – heating for swimming pools, cooling for fi tness studios, and a host of other spaces in between – is vital to the overall energy performance strategy. The starting point is the building fabric performance. For St Sidwell’s Point, primary considerations
specifi ed facade
systems were high levels of thermal insulation, minimal thermal bridging, and low levels of unplanned air movement. The building featured three main types of external wall build-up: steel frame construction, blockwork, and cross-laminated timber (CLT). Common to all three was the placement of the insulation and air barrier to the outside of the structure, contributing to the target U-value of 0.14 W/m2
K.
Using Wraptite to achieve a high standard of airtightness Wraptite is a self-adhered membrane, which is both airtight and vapour permeable
membrane. Positioning it externally moves the airtightness barrier away from the internal services zone, simplifying detailing and reducing the number of penetrations. It is also a Passivhaus-certifi ed component, reinforcing its credentials as a high-quality product that can help projects to meet the standard. To supportits use, the A. Proctor Group provided a Wraptite toolbox talk on site, and conducted practical training using mock-up panels to demonstrate best practice installation.
01250 872 261
www.proctorgroup.com
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