Thermal efficiency and the energy our buildings waste have become key topics on both an environmental and financial level. Buildings account for more than 40 per cent of all carbon emissions, consequently the need to provide ways to minimise our ‘footprints’ has become a major concern.
This can be difficult to achieve on Listed buildings, be it a museum or a house, as changing the original draughty, timeworn windows is not always an option. Secondary glazing is an independent window fitted to the room side of a building, and is an unobtrusive and fully reversible adaptation, widely accepted by most heritage bodies.
When airtightness is a requirement to reduce draughts from the original window, air permeability performance below 5m3/h.m3 is readily achieved with Selectaglaze sliding systems and below 1m3/h.m3 with Selectaglaze hinged systems. All of Selectaglaze’s units are tailored to the individual window and using high performance seals ensure the tightest fit, reducing air infiltration and virtually eradicating drafts.
Selectaglaze secondary glazing systems improves the thermal efficiency by using low emissivity glass, reducing heat loss by more than half across the window and achieve a U-value of around 1.9. With sealed secondary glazed unit this is further reduced and a figure as low as 1.3 is achievable.
Selectaglaze secondary glazing has been used on buildings across different sectors from listed offices to new build hotels helping projects achieve high BREEAM ratings. Selectaglaze has worked on projects such as Wiltshire Town Hall and Ham Yard Hotel which have both achieved a BREEAM “Excellent” rating and Albany House and Mortimer Street apartments have received a BREEAM “Very Good”.
The Selectaglaze range is extensively tested and offers designs to suit all buildings across all sectors. Selectaglaze Technical Advisors will be at Ecobuild to offer technical advice on the benefits of secondary glazing. Visit them on stand E2152 to see how secondary glazing can help your project.