Does Secondary Glazing Reduce Condensation?

Condensation forms when warm, moist room air contacts a cold window surface. Secondary glazing prevents this by creating a warm air buffer between the room and the cold external glass. The secondary panel is the surface facing the room — and because it is insulated from the cold external glass by the air cavity, it stays warm. No cold surface, no condensation.

Which Properties Benefit Most?

Victorian and Edwardian properties with single-glazed sash windows; flats in older buildings; properties in high-humidity areas; bedrooms and kitchens; ground floor and basement properties.

Acrylic vs Glass

Acrylic secondary glazing has a slight advantage for condensation control — lower thermal conductivity means the inner surface stays warmer. But both effectively eliminate condensation on the original window behind.

Interstitial Condensation

A small discrete ventilation path between the cavity and room manages any moisture in the cavity. Our installation team addresses this during every installation.