By maintaining higher inner surface temperatures at the glazing edge, warm edge spacer bars reduce the likelihood of the glass reaching the dew point, preventing condensation, mould growth and long-term damage.

Aluminium has high thermal conductivity and creates strong thermal bridges at the glazing edge, leading to increased heat loss, lower inner surface temperatures and a higher risk of condensation.

The glazing edge forms a thermal bridge between the interior and exterior of a building. Heat loss at this point is higher than in the centre of the glass, which can negatively affect Uw and Psi values, increase energy demand and lower inner surface temperatures.

A warm edge spacer is a spacer bar used in the edge seal of an insulating glass unit that has low thermal conductivity. It reduces heat transfer at the glazing edge compared to conventional aluminium spacer bars, improving the overall thermal performance of windows and façades.