Gilberts helping create the right environment for a new generation in museum development

  • 2 Jun 2021

Gilberts turns roof ventilation upside down to help a plan to repurpose part of the Museum of London’s new home.

The Museum of London received planning approval for the historic site in June 2020. A priority is to make the dilapidated General Market building, which has been empty for three decades, weathertight and sound. This allows for the conversion of the space below.

Principal contractor PAYE Conservation is underway with enabling works, balancing protection of key architectural features of the building. These include wood and glass louvred lanterns, which run along all four sides of the main building, that had failed beyond economic repair, necessitating the removal of the glass fixed louvres and secondary vertical supports. 

The solution

PAYE commissioned Gilberts to design a bespoke solution, that maintains the visual aesthetics of the historic rooftop whilst providing adequate free ventilation area for modern standards.

Gilberts’ in-house technical team resolved the issue, and optimised best value, by turning modern strategies on their head. Thus, almost 300 louvres are in production, combining Gilberts’ patented WHF aluminium louvre blades fitted internally upside down, its VN75 damper and, externally, bespoke WGF high performance louvre blades.


Each bank features dummy mullions to mimic the original secondary supports which have had to be removed. Electric controls behind the fixed louvres will enable for the control of ventilation via the Building Management System.

The complete units deliver Class A weathertightness of 99%, with a net free ventilation area of 50%.

‘Gilberts is playing a fundamental role’

Ian Rogers, Gilberts’ Sales Director, comments: “The original timber mullions compromised space for modern levels of airflow. Fitting a refined version of our WHF upside down, with our VN damper and a bespoke version of our WGF externally optimises the maximum free ventilation area in line with today’s requirements.”

Mark Pettyfer, Associate Director at PAYE, adds: “Coincidentally the ventilation requirements for the museum are similar to those of the market – the need for fresh, air without damp and draughts – except that instead of protecting and preserving delicate fruits and vegetables, we are preserving the city’s history and heritage.

“Gilberts is playing a fundamental role in helping us deliver that whilst maintaining the aesthetics of the atmospheric building. As a company, it has the technical expertise and manufacturing capability to engineer a bespoke, discreet, functional solution.”

Gilberts is one of the UK’s leading manufacturers of louvre screening. It provides comprehensive packages to keep pace with the evolution of building design and structural interfaces. Options include standard and high performance, factory- and site- assembled, and acoustic variants.


Gilberts of Blackpool,
Gilair Works,
Clifton Road,
FY4 40T

Phone: 01253 766911
Fax: 01253 767941

Visit Gilberts of Blackpool's website

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