Independent research proves Pilkington Spacia™ is the best retrofit glazing for period homes

Report prepared by Changeworks for
The City Of Edinburgh Council, July 2010

In 2009/2010 Changeworks, a sustainable development organisation, led a project in Edinburgh, in which single-glazing products and their thermal performance was measured in situ by Glasgow Caledonian University. The project was funded by the City of Edinburgh Council and Historic Scotland and supported by the Edinburgh World Heritage Trust and Lister Housing CoOperative. The project results showed that replacing single-glazed with slim profile double glazing can significantly improve the thermal performance of historic timber windows, whilst retaining their joinery work. The project’s findings, published in a project report for the City Council and in Historic Scotland Technical Paper 9, led to a change in Edinburgh’s planning guidelines for listed buildings in 2012, which now allow for the installation of slim-profile double-glazing in listed buildings.

In 2011/12 after the new glazing was in situ for two years it was decided to re-measure thermal performance of the replacement units and compared these results with the results of the initial project. The results are detailed in Technical Paper 20 and a comparison of the results is also featured in the Table below

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Spacia in Edinburgh

Comparison Of Results

Comparison table
2009 report

2009/10 REPORT
This project ran from March 2009 to March 2010, and involved retro-fitting a range of bespoke, slim-profile double-glazing units into category ‘A’ and ‘B’ listed buildings in Edinburgh’s Old and New Towns, both of which are conservation areas and form a UNESCO World Heritage Site.

2011 Results

2011/12 REPORT
In 2011/12 after the new glazing was in situ for two years Changeworks re-measure thermal performance of the replacement units and compared these results with the results of the initial project. The results are detailed in this report Technical Paper 20.

COMPARISON TABLE
A comparison of the results from both surveys is featured in the Table above

Pilkington Spacia™

The Benefits Of Pilkington Spacia™

  • FIVE times more efficient than standard single glazing
  • World’s thinnest profile 6.5 mm (¼”)
  • Virtually eliminates draughts, cold spots and internal condensation
  • Greatly reduces noise levels for a quieter home
  • Successfully used in Japan for over 15 years
  • Full 15-year guarantee
Spacia Diagram

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