Abbey School, Chester

Secondary glazing in an exceptional school for exceptional children

Abbey School

Set in the grounds of the imposing 600 year old Chester Cathedral, are two Georgian buildings, which have been transformed into the ‘Abbey School for Exceptional Children’. Grade II* Listed and within the surrounding conservation area, planning authorities had to be consulted to approve any changes to be made. Some of the most striking external features are the windows; examples including 12-pane Georgian box sashes, as well as a couple of tripartite 4-12-4 pane sashes. Most of the windows were original and single glazed, which provided little thermal and acoustic insulation. Airflow was one of the key elements of the design, so a sustainable multiroom ventilation and heat recovery system (MVHR) along with an air source heat pump was installed to create a comfortable environment. However, the performance of the original glazing had to be addressed, to reap the benefits of these new systems. 70 units were installed throughout the buildings from seven different systems. They were glazed with 6.8mm laminate K glass and set 200mm from the primary windows. Historic shutters were retained and to allow their full operation, secondary glazing was fitted with a special rebated timber with the greatest possible cavity room side of them.
Grade II* Listed Abbey School entrance post conversion
Selectaglaze series 60 used to meet the off set sash lines of the primary glazing in an Abbey School classroom
Secondary glazing with a fitch catch in front of decorative stained glass original window
Large single glazed windows in Abbey School classroom with acoustic Series 20 secondary glazing
Secondary glazing set out from the windows to allow the original shutters to fully function

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