Secondary glazing from Selectaglaze has been introduced to Whitehall Museum, a 500-year-old Grade II* Listed Tudor building, as part of a £1.6 million refurbishment and restoration to tackle damp issues, improve thermal performance, and remove 20th century fixtures while restoring some of the original features.

The introduction of secondary glazing traps an insulating layer of air, which can reduce heat loss by more than 50 per cent, with low-emissivity glass enabling the achievement of U-values of around 1.8.

Main contractor R. Durtnell & Sons, specialists in the sensitive restoration and refurbishment of heritage buildings, approached Selectaglaze to carry out the secondary glazing works.

Fifteen units were installed from the lightweight range along with two fire-retardant units. The old Tudor building’s sloping irregular floors, bowed walls, uneven ceilings and irregular window openings necessitated high levels of craftsmanship. Tapered and splayed timber grounds were used to take up the building’s irregularities. Once in place, the secondary glazing was installed, which was seamlessly designed to suit the original windows.