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Zenon GRP Rooflights

Hambleside Danelaw Ltd have been manufacturing GRP rooflights in the UK for over 45 years. Our brand, Zenon®, is the market leader in developing environmentally conscious solutions to improve building energy performance, while reducing the carbon footprint through the efficient and effective use of daylight.  Our GRP rooflights can be used in industrial, agricultural, and commercial buildings. 

Lighting the way with Profiled Rooflights

Rooflights play a vital role in the modern building, but are often overlooked. They can help the designer, the building owner and the occupier to achieve a truly sustainable, energy efficient and enjoyable place to work and to live in.

Rooflights allow up to three times more natural light into the internal space than a window/vertical glazing of the same size.

Correct rooflight design – at the outset of the building concept or fitted retrospectively – can have dramatic efforts on all aspects of the building.  Impacting the owner’s potential asset value, to the well-being and productivity of the occupants.

Buildings which provide high levels of natural light generally have more positive working environments than those which are dependent on artificial light. People respond better in natural light conditions, as the eye and brain functions work better.  This results in improved concentration and overall performance. Introducing rooflights reduces dependency on artificial light, which significantly reduces energy consumption and running costs.  This also impacts positively on the buildings overall carbon footprint.

In addition, thermally efficient insulated rooflights can further reduce heat loss and energy costs.

The Building Regulations Approved Document Part L recognises these benefits, as well as the effectiveness of rooflights as a contributor. Standard recommendations suggest that industrial and commercial building structures should have a GRP rooflight area of 10% to 20%.

The graph below demonstrates the reduction in CO2 emissions of a typical notional building as the rooflight area is increased to the optimum 16% to 18% and used in conjunction with a fully automated lighting control system.

Design Considerations for GRP Rooflights

SBEM Graph GRP Rooflights

Source: SBEM results – CO2 emissions for the Notional Building at varying rooflight area; graph 1, NARM NTD06.2: Designing with Rooflights 


The diagram above features other aspects to be considered within sustainable building design. To find out more about these considerations and their importance when specifying Zenon GRP rooflights, please visit our technical guidance section.

Whatever the principle daylighting design consideration there is a Zenon solution to match. Whether specifying commercial or industrial GRP rooflights, contact us today.




Download our White Paper – GRP rooflights: Sustainability from natural daylight in the built environment

Download a brochure

Download the Zenon Brochure or our comprehensive Technical Manual

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You can contact our dedicated technical team who’ll be glad to help

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Hambleside Danelaw Limited
Long March, Daventry, Northamptonshire, NN11 4NR, UK
+44 (0) 1327 701 900   |   +44 (0) 1327 701 909

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