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A mono-pitched solution ideal for flat roofs

Longlight 5-30°

Suitable for:

  • Flat and sloped roof
  • Flat roofing material
  • Opening width in roof min./max. 0.6-3.1 m (for venting modules 0.8-2.5 m)
  • Rooflight installation pitch 5-30°

Key benefits:

  • Subtle expression thanks to low pitch design
  • Adding daylight to hallways, corridors and large rooms
  • Great value-for-money due to fast and hassle-free installation
Spacious atrium with staircase and VELUX roof windows, modern design.
Trumpington Community College, Cambridge, Great Britain

Product details

In short

A Longlight solution is a single row of modules that lights up hallways, corridors and large rooms with natural daylight. Multiple rows of Longlights form an ideal glass roof for large open areas, e.g. atriums. Install the Longlights to follow the interior floor plan to optimise daylight and ventilation in every corner of the room.

The modular Longlights allow fast and easy closure of the roof to reduce cost and speed up the interior works.

VELUX skylight specialists offer support throughout design, specification and installation, including design of the sub-construction needed for installation.

View an interactive 3D cross section of the Modular Skylight solution
Modular VELUX flat roof window with multiple glass sections for flat roofs
Longlight solution
Additional solutions

Create a unique skylight solution

By adapting the interior linings, the Modular Skylights can meet the demands of modern architecture featuring irregular or curved shapes, e.g. obtuse angles, acute angles or ovals.

Further product details of Modular Skylights
Modular VELUX flat roof window with multiple glass sections for flat roofs
Longlight solution
Modular VELUX flat roof window with multiple glass sections for flat roofs
Longlight solution

Get inspired by our case studies

Modern museum interior with skylights, staircase, and people walking.
Education

Royal Veterinary College

Daylight and fresh air for the longest-established veterinary school in England

London, United Kingdom — 2023Read more
Modern corridor with red and yellow accents, people walking.
Education

DCU Polaris Building

VELUX Modular Skylights bring daylight, ventilation and vitality to a cutting-edge STEM hub

Dublin, Ireland — 2025Read more
Classroom with students working at tables, modern furniture and educational materials.
Education

Oasis Academy

Innovative daylight level analysis software as part of design planning

Leesbrook, United Kingdom — 2020Read more
Other solutions in this product group
VELUX flat roof window module with five glass panels in dark grey frame.
Wall-mounted Longlight 5-45°
Modular VELUX flat roof window with multiple glass panels on white background.
Ridgelight 25-40°
Modular VELUX flat roof window with multiple glass sections in dark grey frame.
Ridgelight at 5° with beams
Modular VELUX flat roof windows arranged in rows on a flat surface.
Step Longlight / Ridgelight
Modular VELUX flat roof window system with multiple connected glass rooflight modules.
Atrium Longlight / Ridgelight
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Frequently asked questions

What is the maximum span for a Longlight 5-30° installation?

The maximum opening width for a Longlight 5-30° roof window is 3.1 meters. This is a guideline, and the exact measurements would be supplied by your VELUX Commercial sales company. The length of the system can be extended indefinitely depending on building statics.

How do I ensure proper ventilation with the Longlight 5-30° installation?

Proper ventilation with the Longlight 5-30° solution can be achieved by incorporating venting modules for comfort and/or smoke ventilation. These modules have chain actuators that allow for controlled opening. You can operate them using either VELUX io-homecontrol® or Open System with ±24V DC connection to your building management system, depending on your configuration.

How do I manage water drainage with this type of skylight solution?

VELUX Modular Skylights come with factory-finished flashings designed to ensure watertightness. The modules have been tested for watertightness up to 1200 Pa (equivalent to wind speeds of 155 km/h), achieving classification E1200.

Is it possible to combine VELUX io-homecontrol® with Open System in the same installation?

Yes, it's possible to combine both systems. For example, you can use the Open System for comfort or smoke ventilation control of the actuators and io-homecontrol® for the roller blinds if you want local control of the blinds but centralized control of the venting modules.

What are the key differences between VELUX io-homecontrol® and Open System, and when should each be used?

The decision often depends on installation size, user needs, and whether smoke ventilation is required. For new construction, the wiring should be planned early in the design phase.

VELUX io-homecontrol® is best for smaller installations with few users who regularly occupy the building (small offices, residential buildings), situations where users need multiple control points, and where ease of installation is important.

Open System is best for larger installations (many skylights on different roofs), buildings with many different occupants not present regularly (airports, shopping malls, public buildings), buildings with existing HVAC or building management systems, and applications requiring smoke ventilation.

Is the Longlight 5-30° suitable for commercial buildings with large open spaces?

Yes, the Longlight 5-30° system is suitable for commercial buildings with large open spaces. VELUX Modular Skylights are designed for various commercial buildings including offices, schools, cultural buildings, public spaces, shopping malls, and healthcare facilities. We can provide several case studies with successful installations in large spaces.

How does the thermal performance of the Longlight 5-30° compare to other rooflights?

VELUX Modular Skylights offer excellent thermal performance with U-values ranging from 1.3-1.5 W/(m²K) for double-glazing modules and as low as 0.86-1.1 W/(m²K) for triple glazing modules, which represents high-quality thermal insulation for rooflight products.

What is the recommended method of maintenance for Longlight 5-30° installations?

The general recommendation for all VELUX Modular Skylights is to clean them 1-2 times per year with water and ordinary household non-abrasive and non-corrosive detergents. We recommend having the modules cleaned by professionals with appropriate tools. Additionally, it's important to clear leaves and debris from flashings to ensure proper drainage of rain and melting snow.

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