Specification for Vitral A74 ROOFLIGHTS
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Description: Modular factory sealed and glazed panel system.
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Type: Double pitch rooflights / Mono pitch rooflights (please choose relevant). Upstand by others.
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Manufacturer: Vitral UK Ltd, 83 High Street, Linton, CB21 4JT
Tel: 01223 499000
Fax: 01223 499001
e-mail: vitral-uk@vitral.co.uk
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Quality control of component manufacture: system to be manufactured to ISO 9001:2000
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Product reference: Vitral A74
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Frame: Thermally broken aluminium frame with thermal break of at least 20mm.
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Frame width: Sightlines between fixed &/or opening profiles to be 50mm or less Incl dual gaskets
and drainage system.
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Finish: Natural anodized or PPC coated aluminium frame in any standard RAL colour. Coating is
applied according to GSB standards.
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Glazing details: Double glazed argon filled super low-e insulating glass units with reflective metal
oxide coating applied off-line, laminated inner pane and toughened outer as required to resist
maintenance and impact loadings and for the properties below:
 Light transmittance:
0.78 (78%)
 Total energy transmittance (G-Value): 0.60
For Special glass requirements, please contact Vitral.
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Impact resistance: Complete rooflight assembly to be independently certified by accredited test
house to TN66 / TN67 for impact resistance.
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Thermal transmittance: U-value (combined frame and glass) to be less than 1.6 W/m2°C
according to EN12567-1:200: Thermal performance of windows and doors – determination of
thermal transmittance by hot box method – Part1: Complete windows and doors.
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Air permeability: Rooflight system must achieve Air permeability Class 4 at 600 Pa according to
EN12207 – Windows and doors - Air permeability - Classification
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Water permeability: Rooflight system must achieve Water permeability Class E1200 according to
EN12208 – Windows and doors - Watertightness - Classification.
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Acoustic requirements: System must have independent laboratory test results for airborne sound
insulation for the same frame and glass build up as specified. Measurement to be according to
EN ISO140-3:1995, EN ISO 717-1:1994 including 2006 amendment. Sound reduction Rw to be
34dB (or higher).
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Verification of Performance: Rooflight to meet the requirements of EN14351-1 with declaration of
performance and accompanied by a CE Label to prove complete system has been tested for
watertightness, thermal transmittance, air permeability. Manufacturer must prove that a quality
management system and factory process control system is in place.
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Rooflight Installation: To be carried out by a trained and approved installer.
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All external weatherproofing and internal finishes of upstands by others.
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Support structure: All continuous structural supports at the cill, hip, valley and verge shaped &
aligned to suit the pitch of the glazing to be provided & fixed by others.
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Special note: Loadings and reaction forces applied to the kerb by the self-supporting rooflight
assembly. Please ask your structural engineer to check that the kerb design is strong enough for
the loadings applied, as detailed in Vitrals preliminary loading calculation sheets.
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Ventilation: If required: Rooflight to incorporate full length opening panels for natural daily
ventilation.
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Vent design: Vents to be flush in-line with the glazing. There should be no visible difference in
framing between a fixed panel and an opening vent. System must be designed to enable retrofit of
openings at a later date with no additional casement, only a crossbar and an actuator.
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Actuators and controls to be supplied by Vitral via Vitral installer to match the requirements of the
scheme. Details from Vitral.
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Wiring supply and commissioning of controls, by others.