4 expert articles on secondary glazing for London period sash windows, from heritage specialists with 15 years' experience.

• Secondary Glazing vs. Double Glazing for Listed Buildings: Which Passes Conservation? — Improving the thermal performance of a listed building requires more than choosing the most efficient glass available. The proposed work must also…
• The Science of Secondary Glazing: How a 150mm Air Gap Cuts Heat Loss by 70% — For owners of period properties, improving window performance involves more than choosing the lowest U-value. Original sash windows contribute to a…
• Secondary Glazing Vs. Draught Proofing: Which Is Better For Your Period Sash Windows? — Period sash windows provide architectural character, but original single glazing and ageing seals can reduce comfort, increase heating demand and allow…
• Can't Sleep Because of Traffic Noise? How Acoustic Secondary Glazing Cuts Noise by 50dB — How 10.8mm Stadip Silence acoustic glass and a 150mm air gap cut London traffic noise by up to 50dB in period sash windows.