Rooflight Specification

Xtralite have a comprehensive range of bespoke and standard rooflight systems to accommodate modern architectural design, the appropriate legislation and daylight requirements.

The specifier has three key issues to consider when assessing what type of rooflight is required

1. The rooflight shape/material

2. The ventilation requirement

3. The roof mounting

This section of the website takes you though each of these key areas detailing the options available. For further help and assistance please contact us via the contact form above.

Shape

The specification decision regarding shape is mainly a personal viewpoint though the following should be considered:

• Pyramids tend to be less likely to suffer from vandalism as they are difficult to climb on.
• In the main, circular/dome rooflights are used in conjunction with curved roofs and pyramids with angular roofs.

Dome XL 102	Pyramid XL 100	Circular XL 102 c
Hexagonal XL 104	Northlight Wedge XL 107	Hemispherical XL 253
Thermoformed Barrel Vault XL 101	Continuous Pyramid XL 100 c

Clear	Bronze
High light transmission. Light glare inside the building can be a consideration on sunny days. Can look dirty from below if not cleaned regularly. Allows full vision of views and objects.	Reduces solar heat gain. Reduces light transmission into a building.
Diffused
Maximises privacy. Good light transmission into a building. Diffuses light transmission and so avoids glare and shadows. Prevents vision of views and objects. Opal available as an option

Rooflights can be used to provide ventilation, extraction of stale and the introduction of fresh air. Xtralite provide a range of differing systems with varying performance levels—see table

Mechanical Ventilation

There are occasions when a more positive form of ventilation with a known and quantifiable air exchange performance may be required, under such circumstances a power fan can be fitted to the rooflight unit.

There are two methods for achieving this:

• With a power fan unit built into the polycarbonate glazing skins. This option allows either a 150 mm or 225 mm power fan unit to be specified.
• With a smaller fan mounted into the side wall of the kerb. In such an arrangement the kerb will necessarily be higher, to provide the required 150 mm clear upstand height to the base of the fan unit.

Ventilation Options
Permanent Vent XL 53	Controlled Louvre on Adapter Kerb XLAK 90
As the name suggests, this option is permanently open and shielded from the elements by a external shroud which cannot be tampered with.	Louvre inset into side wall of unit, this can be manually operated to provide anything from ‘trickle’ to ‘full on’.
Manual Hinge Vent on Adapter Kerb XLAK 129	Electrical Hinge Vent XL 63
The whole rooflight top hinges open to allow ventilation through opening large vent areas
Background Vent on PVCU Kerb XLPVCU 03	Powervent XL 66
Low level ventilation for ‘background’ air change.	Used where a high level of ventilation is required and can be mounted in upstand or in glazing. Please refer to ventilation performance chart.

Where required Xtralite supply a complete range of kerbs to support all the different shapes on offer and link to the majority of different roof systems and types.