Square window

The PROGRESSION range of Passivhaus certified triple glazed timber windows is a popular choice among Passivhaus designers because of its high performance (Uw 0.68 W/m2K) and ‘frameless’ contemporary aesthetics. Its ‘frameless’ minimal sightlines, whereby the window frame is mostly hidden, also maximises daylighting and passive solar gain when needed.

The PROGRESSION range is made from timber, with an insulated frame, and is inward opening, with tilt & turn options. The PROGRESSION triple glazed window has received A-rated Passivhaus certification from the Passivhaus Institut and is supplied in the UK by Green Building Store. The window has dual compression seals for long-term airtightness.

Green Building Store’s PROGRESSION range is available with low maintenance external cladding options of either GRP (glass reinforced plastic) or Thermowood (heat-treated timber).

The PROGRESSION range has been specified for a wide range of Passivhaus and EnerPHit (Passivhaus retrofit) projects around the UK.


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