Energy Ratings / Glass Performance

Timber has its own naturally good thermal performance...

plus we only use energy efficient glazing units. Therefore we can achieve excellent results regarding energy efficiency and consumption. Our windows have been tested to the highest standards for air tightness and every window we supply comes with its own specific Energy Rating.

energy ratings

Glass Performance

The table shows the performance of various glass combinations that can be achieved to suit your requirements. Standard glazing units offer a super low-e u-value of 1.1W/m2K.  

U- Value (W/m2K)

A size value that shows heat loss through an area of 1m2 (one square metre) when the difference between the inside and outside temperature is one degree Celsius.

Light Transparency – LT%

The amount of visible light passing through the glass in terms of the percentage of outdoor light falling on the window.

glass performance