The Perfect Solution For Old Timber Sash Windows

Pilkington Spacia™

For a more comfortable home, simply retrofit ultra-thin Pilkington Spacia™ double-glazing into your existing sash window frames.

  • 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

How does Pilkington Spacia™ compare?

In order to achieve the same U-value as Pilkington Spacia™ a double-glazed unit would need to be 20 mm thick, compared to 6.5 mm.

Spacia Comparison

Maintain The Historic Appearance

Pilkington Spacia™ can be easily retrofitted into your existing window frames – usually within one working day. There is little or no redecorating required.*  What’s more, the historic appearance of period homes is unaffected.

*Subject to survey – some minor repainting may be required depending on your frame type, but this will be confirmed on survey.

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

In 2009/2010 Changeworks, 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.
Changeworks Edinburgh
st gerrards

Case Study: St. Gerard’s School

The building pre-dates the school itself and is more than 150 years old. On all sides of the building, and on both floors, are large, sliding sash windows.

As a result of the windows, energy-efficiency was very low, as Tom Geraghty, the school’s Headmaster explains: “While it is a very beautiful building, it was also expensive to heat, and difficult to keep warm during the colder months of the year – at least, not without intensive heating.

Download A Spacia Brochure

Spacia Brochure Download