System 100 - PERFORMANCE SPECIFICATION
Aluminium windows
Windows, curtain walling and other glazed areas are to be a unitised composite aluminium/wood system.
The system must be a fully ventilated and drained
System with concealed drain-channels, thermally broken and pre-fabricated.
The system must have an internal structural frame of laminated Scandinavian Pinewood (Pinus Sylvestris), and an external aluminium sash alloy AIMgS0,5. The sealed glass unit must be internally dry-glazed with EPDM gaskets and the glass rebate must be formed of aluminium.
Softwood windows with external aluminium
cladding will not be permitted.
Ironmongery
Must be tested and approved in strict accordance with current DIN norms.
Finishes
The external aluminium sash must be polyester powder-coated in compliance with BS 6496, BS 6497, GSB and DIN 50939, in RAL colour [ ] to gloss level 77%, and a primary coating thickness of between 60-120 µm.
The internal structural frame of laminated Scandinavian Pinewood must be VACUMAT
preservative treated with fungicides and have a further two coat factory pre-finish with an
environmentally friendly (solvent free) 100% Acryl emulsion/water-based surface treatment.
The coating is to have a dry paint thickness of between 60-100 µm and a colourless finish to gloss level 25 (silk matt).
Performance
The proposed window system must have an
expected lifespan of 60 years with regular
maintenance.
The window system must be tested and meet the
requirements of DIN 18055.
Strengths
The window system, glazing and fixings must be designed with full consideration to the anticipated imposed loads based upon the following data.
Window loads in accordance with CP3: Chapter 5: Part 2: (1972) for a basic wind speed, V=[ ] in category [ ].
Thermal transmittance
The thermal transmittance (U value) for the window system and glazing shall not exceed:
frame construction
U-value = 0.39 W/m2 K, spandrel panels
U-value = 2.5 W/m2 K glass
U-value = [ ] W/m2 K
Interface details
The use of site-applied wet or dry sealant placed in the outermost plane of the windows/screens in order to seal between units and/or other adjacent
materials will be unacceptable.
Any such detail making use of such sealants must be set back from the outer face of the windows min. 10 mm to provide a shadow line gap to the perimeter of each sash.
No reduction in the performance and weatherability of the window system shall be experienced as a result of complying with the
aforesaid.
VELFAC LTD, The Old Livery, Hildersham, Cambridge CB1 6DR.
T: 01223 897100 ● F: 01223 897101 ●