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25 Cannon Street, London

GRP Dura Grating | Case Study

Project: Cannon Street, London

Client: ASME Engineering on behalf of Buckley Gray Yeoman

Occupying a prominent island site directly opposite one of London’s most prominent landmarks, 25 Cannon Street is a five-storey, neoclassical office building with a design which is respectful of its location in the heart of the City of London. Views of St Paul’s Cathedral and other landmarks on the city skyline are protected by planning controls. A policy known as ‘St Paul’s Heights’ protects and enhances important local views of the Cathedral from a range of vantage points, including from the building at 25 Cannon Street.

In 2020, London architecture studio Buckley Gray Yeoman was selected to deliver a comprehensive modernisation of the 168,000 sq ft office, with ASME Engineering chosen to commission and install screening to the plant equipment on the rooftop which would be compliant with the St Paul’s Heights policy.

ASME Engineering turned to Dura Composites to design and supply Glass Reinforced Polymer horizontal screening panels to protect the equipment housed on the rooftop from the elements, whilst maintaining airflow with minimal visual impact and allowing for access by maintenance personnel.

A combination of Dura Grating 50mm Standard Mesh and d2 Dura Grating 45mm Mini Mesh were used to meet the distinct requirements of the various areas, with the larger hole-sized product providing the correct level of ventilation for the Air Handling Units, and the smaller hole sizes of the mini mesh providing additional privacy in other areas of the roof to minimize the impact on the historic views of St Paul’s.

Non-conductive, lightweight and requiring minimal maintenance, the Dura Grating panels were supplied with powder coated fixing clips and hinged access panels, and offered the perfect strength-to-weight ratio for the project.

Speaking about the project, Nigel Levis, Commercial Manager at ASME Engineering commented:

This was a fascinating project to work on, especially with the added complexity of the St Paul’s Heights regulations and the need for an aesthetically pleasing screening solution for both the building users and the adjacent neighbours.


Working closely with Dura Composites meant that we and Buckley Yeoman Grey were able to select the right combination from Dura’s unique grating designs to meet the required weight and percentage of open area. Using different gratings in different zones delivered maximum cost efficiency for the project.

Unlocking the Power of Composites for Plant and Equipment Screening:

Dura Composites can support the building renovation and construction sector with a range of value-added services including specialist cutting, routing and fabrication of our GRP product range.

We have an in-depth understanding of the bespoke nature of historic building renovations, and can demonstrate compliance with a range of testing and certification parameters – including loading and deflection. We also offer a 3D laser scanning service which creates an exact replica of your project site with minimal disruption.

Two-time winners of the Queen’s Awards for Enterprise, Dura Composites’ advanced GRP composite materials offer a host of real-world benefits including a superb strength to weight ratio, lightweight properties, non-corrosiveness, and an extensive low maintenance lifecycle.

The use of Dura Composites ‘efficiently designed GRP  that is lighter than traditional equivalents also means that you reduce the material embodied carbon, install carbon and deliver a design life of sixty years.

More About GRP Screening

Discover the benefits of d2 Dura Grating

Dura Grating Standard Mesh
26mm, 38mm & 50mm

Dura Grating Mini Mesh
23mm, 35mm, 45mm & 55mm

Dura Grating Micro Mesh

Dura Grating Solid Top
29mm, 41mm & 53mm

Designed, developed and manufactured by Dura Composites, d2 Dura Grating offers outstanding safety, performance and durability and is more cost-effective than traditional GRP grating in almost every scenario. It can be applied in all industries where GRP mesh grating is used today and has an industry-leading Class Bfl-s1 fire rating as standard in accordance with BS EN 13501 (excludes 23mm). As with all our grating, it can be supplied with a range of stainless steel clips, clamps and hold down fixings to suit all install scenarios.

A comprehensive range of load testing data is also available within our searchable Online Product Selector database to help you make decisions based on real data to ensure maximum safety for your project.

Contact our Specialist GRP team about our Composite Solutions on 01255 440290

Joe Hunt

Industrial Sales Manager

Ian Dennis

Industrial Sales Key Account Manager

Danielle Lewis

Industrial Sales Account Manager

Send us a Technical Enquiry about your Project

GRP Products

d2 Dura Grating | GRP Heavy Duty Floor Grating

Designed, developed and manufactured by Dura Composites, unique d2 Dura Grating offers a 33% weight saving, Class B fire rating and Ball Fall test compliance.