Celeste Flat Roof Windows
Celeste is a range of high quality rooflights designed to give architects the opportunity to maximise the use of natural light in flat roofed structures. The rooflights are available as fixed or opening units with single, double or triple glazing. Celeste dome lights can either be fitted to a suitable existing upstand or to the appropriate Celeste curb upstand.

Available as a complete unit or by individual elements.
Complete Unit
Individual Elements
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Roof Finishes
Celeste roof windows can be installed in 3 layer felt, asphalt and glass fibre matting.
Procedures:
3 Layer Felt Roofing
The first layer of felt is laid to the edge or the trimmed opening. The Celeste GRP upstand is then bedded into position. The second layer is then laid to abut to the edge of the upstand. The final layer is then laid running over the upstand to finish under the lip.
Glass Fibre Matting

The outer surface of the Celeste GRP upstand is treated with a weather coating. In order to enable glass fibre matting to bond satisfactorily to the upstand, this weather coating must be removed by cleaning with Acetone or Methylene Chloride.

 
Asphalt Roofing
When fixing to asphalt roofing the Celeste GRP upstand is simply set in bitumen and screwed to the decking in the normal way.
Once the upstand is fixed, sheathing felt should be laid to mask the sides of the upstands and then the asphalt can be laid in the normal way.
 

Materials
Single skin dome lights and the inner and outer skins of multi-skin lights are manufactured in clear polycarbonate which has a specialist UV stabilised outer surface. Tinted and opal outer skins and diffused inner skins are also available.
Upstand curbs are manufactured in insulated GRP and in PVC to match the dome light sizes available.
Light frames for ventilation and access are manufactured from PVC-U whilst circular and specialist opening frames are manufactured from aluminium.

Shapes and Sizes
 The range includes square, rectangular and circular units with pyramids or domes in the sizes shown in the following tables

Celeste dome lights are coded by their daylight area, complete units including dome light and upstand curb are also coded by the daylight area.   Maximum custom made curb size for dome only applications is daylight area plus 130mm. Absolute dome size is 160mm greater than the daylight area.
 

Guidelines For Dimensions Of On-Site Upstands
 - for standard Celeste Domes

Minium height of upstand = 150mm

Maximum finished width of upstand (from daylight dimension) = 65mm

Dome fixings are at:
'Daylight size' + 70mm (2 x 35mm)
 

Celeste upstand curbs
GRP rectangular upstands are available in two heights - 150mm unvented and 300mm vented or unvented.

PVC upstands and GRP circular upstands are unvented and available 150mm high only.

Curb adaptors in aluminium are available to allow standard dome light sizes to be fitted to non-standard or site prepared upstands.

Light Frames
 Opening light frames are available to fit all square, rectangular and circular Celeste upstands. All Celeste opening light frames are supplied complete with hinges and catch/stay or control gear hardware.
Opening Gear
 A hand operated mechanical stay holds the light at any position from closed to a maximum opening of 280mm using an opening rod.
An electrically operated mechanical stay holds the light at any position from closed to a maximum opening of 280mm using a wall mounted control box.
Larger size units require special tandem units.

Access Gear
 Units can be supplied with a hand operated catch which secures the light in a closed position but which can be released to allow access to the roof for maintenance or as an escape route. These units can have either chain restrainers or telescopic stays to prevent overswing when opening.

The chain restrainers will support the light at the fully open position.
Telescopic stays also support the light at the fully open position. However, once the catch is released, these stays act to aid opening and the catch must be re-engaged for the light to remain closed.
Access gear can be fitted to square and rectangular units up to a maximum daylight area size of 1000 x 1000mm.
Smoke & Heat Activated Gear
Smoke and heat activated opening gear is available. These units require specialist light frames, and actuator gear is designed to meet individual specification requirements. Further details are available on request.
Manual Gear Spindle
Electric Gear Spindle

Natural Ventilation
 Celeste 300mm square and rectangular upstands can be supplied with a built-in manually controlled vent to two opposite sides as standard. Each vent has a free vent area of not less than 4000mm².

Accessories
 Manual gear rods: 1m and 2m opening rods, designed for use with the hand operated mechanical stay, are available and are recommended to ensure trouble-free operation of the spindle gear.

Security
Celeste polycarbonate outer dome lights are extremely tough and give excellent protection against vandalism and sudden impact.
Ubbink supply tamper resistant fixings which make the unauthorised dismantling of Celeste lights from their upstands extremely difficult.
One way clutch-head fixings are also available for a small additional charge.
Light Transmission / Privacy
Celeste rooflights are designed to give the optimum daylight area in relation to the roof aperture size. Clear polycarbonate has a very high level of transmission and spread of light. Tinted domes are available but afford a high reduction in light transmission.
Where privacy is required, Ubbink recommend domes with a diffused inner skin which obscures vision with the minimum loss of light transmission. Opal may also be used but with a reduction in light transmission.
An alternative approach to privacy is to fit pleated polyester blinds to square and rectangular units glazed with clear polycarbonate.		  
Light Transmission Data
Polycarbonate
 Transmission
Clear
 92%

Diffused *

92%
Opal
 50%
Bronze
 45%
The transmission percentages for double or multi-skin domes can be found by multiplying together the factors for the constituent materials.
* Only available as inner skin
U Values
 Celeste upstand units have good thermal insulation performance. Their use with double and triple skin dome lights will minimise the risk of condensation under normal conditions. However, where units are used in areas of high condensation, statutory ventilation requirements must be maintained.		  
Average Thermal Transmittance
 U value of Celeste components
Components
 W/m²K
Triple skin dome light
 1.9

Double skin dome light

 2.8
Single skin dome light
 5.3
Upstand 150 GRP
 1.6
Upstand 150 PVC
 2.8
Upstand 300 GRP
 0.95

Fire
 External exposure designation:
Polycarbonate performs well under fire conditions. All Celeste polycarbonate domes achieve the highest external rating - FAA.
The polycarbonate used to construct Celeste domes has a Tp(a) rigid classification as described in Approved Document B of the Building Regulations.
Surface spread of flame:
Polycarbonate has a Class 1 surface spread of flame to BS476: Part 7.

Class O
Whilst not a classification identified in any British Standard test, Class O is recognised as the highest level of product performance for lining materials. To obtain Class O classification a material must be:
a) of limited combustibility as described in Approved
Document B, or
b) a Class 1 material which has a fire propogation index (l) of not more than 12 and sub-index (11) of not more than 6.
Polycarbonate is a Class O material.

Durability
 All Celeste polycarbonate domes are manufactured from polycarbonate sheet materials which a longlife weather resistant outer surface. The manufacturer gives a 10 year guarantee based on the material's weather resistant properties.

Certification
 Celeste rooflights are covered by Wimlas Certificate of Assessment No 078/00.