Energy Efficient Windows
When it comes to conserving energy there are many facts and figures to consider, but how do you know which figures matter?
If you are building a new home then "U values" will probably matter more to you. The U value measures the amount of heat loss through a substrate such as a wall or window. Its measured as /(m2-k) so when doing comparisons the lower the figure the better.
However, with windows there are two U values to consider ; the Centre Pane U value (CPU) and the Overall window U value.
At Dendura our double glazed units meet CPU value of 1.2w/(m2-k) as standard.
BS6375 part 1
Our traditional range casement window is accredited with BS6375 part 1, achieving the highest class ratings for air permeability and exposure.
| Window Type | Material | Overall U Value |
|---|---|---|
| Standard Traditional | Hardwood (Oak or Sapele) Redwood |
1.49w/(m2-k) 1.38w/(m2-k) |
| Heritage Sliding Sash | Hardwood (Oak or Sapele) Redwood |
1.61w/(m2-k) 1.51w/(m2-k) |