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FIXED Rooflight for Flat Roof

(1 customer review)


Polycarbonate Roof Light for Flat Roof are manufactured to a high standard with triple glazing and a 150mm PVC Upstand. The thermally separated upstand manufactured from PVC plastic profiles ensures a strong thermal performance and resilience to condensation formation.

Our roof lights are leading the way in terms of quality and price, with the thermally separated multi-chamber system. These flat roof windows are available in clear or opal variants. Available in 7 sizes up to 1200 x 1800mm in stock for immediate dispatch.
Triple Layer U-value: 1.8 W/m²K

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Addlite Fixed Roof Light for Flat Roof feature a modern, stylish aesthetic which has been designed from the ground up to provide easy installation as well as high performance. Designed with a modular structure allowing a variety of configurations, the thermally broken frame manufactured from plastic profiles ensures a strong thermal performance and resilience to condensation formation.

For effective heat insulation, our triple glazed fixed roof lights have a U-value of 1.8 W/m²K, the Glazing is constructed from Polycarbonate plastic which meets Part L 2013 requirements.
The PVC Upstands feature a unique thermally separated frame structure with a Multi-chamber system manufactured from plastic profiles for enhanced efficiency.


  • Triple Layer Polycarbonate (PC) Lid
  • PVC Upstand
  • Clear or Opal diffused layers


  • U Value 1.8 W/m²K based on standard triple layer
  • PVC Upstand U-value 1.1 W/m²K
  • Sound reduction 22dB

Dimensions (light transmission area)

  • 600 x 600 (0.18m2)
  • 600 x 900 (0.30m2)
  • 900 x 900 (0.52m2)
  • 900 x 1200 (0.73m2)
  • 1000 x 1000 (0.672)
  • 1200 x 1200 (1.04m2)
  • 1200 x 1800 (1.65m2)

Light Performance

DimensionLight Area
Total U-Value (Inc Upstand)
600 x 6000.181.43
600 x 9000.301.47
900 x 9000.501.49
1000 x 10000.671.54
900 x 12000.731.55
1200 x 12001.041.58
1200 x 18001.651.61

Additional information


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Layer Variant


1 review for FIXED Rooflight for Flat Roof

  1. Amanda Elizabeth

    Great advice on what sizes were required when contacted over the phone, after extensive research I decided to place my order.

    The order was received within 2 days and my builder managed to fit it without any issues, the product itself is fantastic quality, the rooflight is a very nice design, and looks great from below with plenty of light. It has definitely transformed our kitchen extension.. Looks great!

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