Windows

Sash Style casement window

The renovation of historic and listed buildings can be very challenging especially when it comes to the sensitive conservation of the visual features of old facades. The challenge is even greater when there is the ambition to improve the comfort and energy-saving qualities of a building.

For those requiring new vertically sliding sash windows for old buildings, until now, only improved versions of traditional sash windows were available. However the air leakage from these, although substantially improved, is still far beyond that allowed in a Passive House.

Justin Bere of bere:architects is offering an opportunity to learn about German techniques for fitting triple glazed passivhaus windows including positioning the windows to avoid cold bridging in an externally insulated building; fitting air tightness tapes with ‘rabbit ears’ to achieve necessary passivhaus 0.6ach @ 50Pa.; positioning windows with inflatable air bags; and fixing windows without plugs and with headless screws in order to ensure the windows are not distorted during fixing.

Thermal imaging at Passfield Drive

New Passivhaus triple glazed windows and doors have now been expertly fitted to the north elevation of 3 Passfield Drive (wall insulation will follow soon). The excellent thermal performance achieved by these windows and the draft-free fitting can be clearly seen in the thermal image of the north elevation below. Comparing the ground floor window of no. 3 to the neighbouring property on the left it is remarkable how much better our house is performing. The same can be said when considering the difference between the new front door of no.

Justin Bere recently visited the Bayer factory with his two associate directors, Dan Gibbons and Tobias Schaffrin in order to discuss current DoubleGood Window enquiries (www.doublegood-windows.com), window specifications and the latest technical developments.

By Pamela Buxton

Building Design

12 October 2007

Architect Justin Bere is so determined to be part of the solution to climate change that he’s set up his own glazing business

As an architect, it was never Justin Bere’s ambition to set up a window company. But frustration at the standard of UK-manufactured windows, coupled with his admiration for German-made Bayer products, led him to do just that, and this summer Double Good Windows was born.

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