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Article Date: 28th February 2018

Selectaglaze - A Georgian Townhouse is Remodelled to Meet the Highest Energy Performance Standards (Stand C84)

Georgian Townhouse - Passivhaus EnerPHit - Secondary Glazing - Sash Windows

Selectaglaze - An historic Listed Georgian townhouse in London’s Bloomsbury

An historic Listed Georgian townhouse in London’s Bloomsbury has been transformed into a comfortable, peaceful and energy efficient home that approaches Passivhaus EnerPHit standards.

This was achieved by using modern insulation techniques including a cutting-edge secondary glazing system from Selectaglaze that significantly improves the performance of the traditional, single glazed sash windows.

The client wished for a home that used as little energy as possible and offered the most comfortable environment. Robert Prewett of Prewett Bizley architects needed to convince conservation officers that a Grade II Listed building could be fitted with energy saving measures whilst respecting all the historic features.

The large single glazed sash windows were a particular challenge as they represented a significant proportion of the wall area and could not be replaced. With the high levels of insulation that were required along with the need to keep the shutters working in some of the rooms, a bespoke solution was required.

Robert approached Selectaglaze and originally proposed a totally new design but coincidentally the company was both developing a new sash window design and trialling Pilkington’s Spacia thin vacuum units which have a centre pane U-value of 1.0. The resulting Series 25 window proved perfect for the project as it offered high sealing efficiency, a very low U-value and a discreet frame with a specially developed slide catch that allowed shutters to fully close. The home now has air tightness close to 1 air change per hour at test pressure which demonstrates that the secondary glazing is performing very well.

Selectaglaze - An historic Listed Georgian townhouse in London’s BloomsburyThe complexity of the project and the time needed to obtain consents meant that part of the building had to be occupied before the secondary glazing was fitted. As a result, the owner experienced the change in comfort levels offered by the original window and with the secondary glazing in place.

Established in 1966 and Royal Warrant Holder since 2004, Selectaglaze is the leading designer, manufacturer and installer of secondary glazing.

Selectaglaze will be showcasing a variety of secondary glazing products at EcoBuild 2018 in Excel, London at Stand C84.

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