Q: I have a uPVC or aluminium window/door — can you calculate a U-value for it?

A:  Yes. Our calculator is designed for timber windows and doors but we can calculate U-values for other frame types if you already know the thermal performance (e.g., U-value or R-value) of the specific frame profile you are using.

In the case of Aluminium frames if a value is not available we will use the generic figure of 0.9 as being the u-value of the frame.