Case study: Secondary glazing installed in 250 year-old Granary


Secondary glazing installed in 250 year-old Granary, Hindmarsh Hall, to provide enhanced thermal insulation

Hindmarsh Hall, Grade II Listed, was originally one of three granaries at the south-end of the village of Alnmouth, Northumberland. In 1859 it was converted into an Anglican Chapel and only 16 years later was made redundant and used as a village Town Hall.

In the 1930s Leonard King Hindmarsh bought the dilapidated property off the Northumberland Family, saw it refurbished to a fit state and gave it to the community of Alnmouth.

During 2003-04, the Trustees completed a programme of restoration and updating of Hindmarsh Hall – yet, 14 years later, a comprehensive condition survey highlighted further works were required.

Giles Arthur Architects was employed to conceptualise the trustee’s vision; addressing structural issues, space planning and making the building more energy efficient to reduce on-going running costs.

Providing enhanced thermal insulation

Selectaglaze’s 4-12-4mm, low-E, sealed unit secondary glazing was specified to provide enhanced thermal insulation.

All the openings have deep splayed reveals, so the secondary glazing was fixed with a maximum cavity close to the wall face where it was wider, framing the primary window, allowing unrestricted opening of  the units and proving full access for cleaning and maintenance.

Fenestral, partner of Selectaglaze, managed the surveying and installation of the project. Using laser measuring equipment, 3D information was produced for the manufacturing of the timber grounds and casements.

The tall lancet windows posed a challenge due to their height; 3350mm. Each of these openings were built up with a Series 41 side hung casement set between two Series 40 fixed light units.

The timber grounds were crafted on site by experienced installers and scribed to ensure the tightest fit for the secondary glazing.

Restoration and preservation

Giles Arthur RIBA ARB, said: “We have been working with the Hindmarsh Hall committee and Alnmouth Parish Council for over 4 years to secure the long term future of the Hall and expand the range of use it can accommodate.

“Central to the project has been the restoration and preservation of Salvin’s lancet windows as, historically, they have been the weak point in the fabric of the building. The input of Selectaglaze and Fenestral have been invaluable thanks to their extensive experience in the field of secondary glazing in historic properties.

“The completed phase 1 glazing installation went very smoothly and the results should generate the impetus required to realise the much larger phase 2 works to the very large lancet windows in the main hall.”

“We are not only pleased with the functionality of the new glazing – it is doing all it was intended to do from a thermal efficiency point of view and it allows access to the original glazing for maintenance – but it also lets in more light and reveals all of the original windows,” added Dr Bourne, Trustee.


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