Why are U-values important?

U-values express the rate of heat transfer through any element of a building, such as a wall, roof or window. The units used to express U-values are watts per m² Kelvin (W/m²K). This means that if a roof had a U-value of 1.0 W/m²K, for every degree of temperature difference between the air on the surface inside the roof and the air on the surface outside, 1 watt of heat would pass through any m² of the roof.

The lower the U-value is, the better the insulation provided by the material.

For example, here are some typical U-values for building materials:

  • Average conservatory roof: U-value of 3.0 W/m²
  • Double-glazed window: U-value of 2.8 W/m²
  • Solid brick wall: U-value of 2.0 W/m²
  • Cavity wall: U-value of 1.6 W/m²
  • Average house roof: U-value of 0.35 W/m²

An Oakdene Solid Conservatory Roof can achieve a U-value of just 0.18 W/m²

With the exceptional thermal performance of our roofs, they minimise heat loss in winter and help maintain a nice cool room in the summer, which will not only give you a room for all seasons but saves on energy bills!