Its classic visual appearance offers the designer a continuous and expansive external glass face to the façade uninterrupted by external face fixed cover caps. The system is further complemented by the option of introducing concealed frameless top hung casement windows.
Performance Overview
Weather Performance
The Curtain Walling has been tested for weather tightness in accordance with the CWCT dynamic test for curtain walling and achieved the following results:
| Air Permeability | 600Pa | Pass |
| Watertightness | 600Pa | Pass |
| Wind Resistance | 2400Pa | Pass |
| Dynamic Water Penetration (Aero Eng) | 600Pa | Pass |
| Wind Load (safety) | 3600Pa | Pass |
| Air Permeability | 0.02m3/h m2 @ 50Pa | Pass |
Concealed Opening Sash Size Guidance
Maximum height and width cannot be achieved simultaneously. This table provides basic guidance; please refer to size limitation charts in Metal Technology’s technical literature for further details.
| Vent Type | Vent Width | Vent Height | Vent Weight |
| Top Hung | 1500 | 1500 | 100kgs |
Materials
Aluminium profiles are extruded from aluminium alloy 6060T6, T5 or T4 complying with the recommendations of BS EN 12020-2 / BS EN 755 Parts 1 to 9. Polyamide thermally broken sections within this system are manufactured from glass reinforced nylon sections capable of withstanding temperatures in excess of 200 ºC.
Construction
The system is fabricated in “stick” form, is pressure equalised, and self-draining by means of overlapping the transoms onto the mullion members. Water is then channelled to the exterior of the building via the integral drainage chambers within the mullions. Where the transoms connect to the mullions, the joint is sealed by means of a purpose designed transom end seal. The transom members are square cut and fixed securely to the mullions by means of spring cleats designed to fit into integral ports within the cavity of the transom wall.
The system is dry glazed using proprietary, high performance captive gaskets internally. All internal gaskets are bonded and sealed during construction, using Metal Technology’s own waterproof adhesive to ensure that a watertight joint at all cruciform connections is maintained at all times. The double-glazed units and panels are held firmly in position by means of a bespoke concealed glazing lug. All vertical and horizontal joints are sealed off utilising a closed cell, non-gassing polyethylene foam backer rod with a silicone pointed sealant to the external face.
The system is thermally broken throughout by means of a continuous thermal isolator located between the thermally enhanced pressure plates and all structural members. The thermally enhanced pressure plate shall be held in place by aluminium stitch plates. The pressure plate shall be retained by using stainless steel self-tapping screws. Metal Technology recommends that only A2 or A4 austenitic stainless steel fixing screws are used in the assembly of their products.
Carefully designed fixing brackets have been developed for System 17 SP to allow a secure and simple fix so that all loads can be transferred back to the building’s main structural form with ease.
Finishes
The range of sections can be provided in either of the following ranges of finishes:
- Anodised to BS1615 or BS3987 or BS EN 12373-1
- Powder organic coated to BS6496 or BS EN 12206-1
Metal Technology's powder coating is produced to Qualicoat standards. The System 17 curtain walling can accommodate a different colour/finish internally to that used externally.
Glazing
The system is externally glazed and can accommodate glazing units from 32mm to 36mm.
Materials
Aluminium profiles are extruded from aluminium alloy 6060T6, T5 or T4 complying with the recommendations of BS EN 12020-2 / BS EN 755 Parts 1 to 9. Polyamide thermally broken sections within this system are manufactured from glass reinforced nylon sections capable of withstanding temperatures in excess of 200 ºC.
Construction
The system is fabricated in “stick” form, is pressure equalised, and self-draining by means of overlapping the transoms onto the mullion members. Water is then channelled to the exterior of the building via the integral drainage chambers within the mullions. Where the transoms connect to the mullions, the joint is sealed by means of a purpose designed transom end seal. The transom members are square cut and fixed securely to the mullions by means of spring cleats designed to fit into integral ports within the cavity of the transom wall.
The system is dry glazed using proprietary, high performance captive gaskets internally. All internal gaskets are bonded and sealed during construction, using Metal Technology’s own waterproof adhesive to ensure that a watertight joint at all cruciform connections is maintained at all times. The double-glazed units and panels are held firmly in position by means of a bespoke concealed glazing lug. All vertical and horizontal joints are sealed off utilising a closed cell, non-gassing polyethylene foam backer rod with a silicone pointed sealant to the external face.
The system is thermally broken throughout by means of a continuous thermal isolator located between the thermally enhanced pressure plates and all structural members. The thermally enhanced pressure plate shall be held in place by aluminium stitch plates. The pressure plate shall be retained by using stainless steel self-tapping screws. Metal Technology recommends that only A2 or A4 austenitic stainless steel fixing screws are used in the assembly of their products.
Carefully designed fixing brackets have been developed for System 17 SP to allow a secure and simple fix so that all loads can be transferred back to the building’s main structural form with ease.
Finishes
The range of sections can be provided in either of the following ranges of finishes:
- Anodised to BS1615 or BS3987 or BS EN 12373-1
- Powder organic coated to BS6496 or BS EN 12206-1
Metal Technology's powder coating is produced to Qualicoat standards. The System 17 curtain walling can accommodate a different colour/finish internally to that used externally.
Glazing
The system is externally glazed and can accommodate glazing units from 32mm to 36mm.
Thermal Performance
Metal Technology’s Curtain Walling Range, in conjunction with the correct glass specification, is designed to aid compliance with the latest thermal requirements of the current building regulations. The thermal isolator profile has been specifically designed to minimise heat transfer across the mullion and transom.
| System 17 SP | U-Frame Values System 17 SP (36mm) |
| Mullion | 2.05 w/m2k |
| Transom | 2.00 w/m2k |
The following U-values for System 17 SP are based on 7m (w) x 8m(h) curtain walling screen.
| Achievable whole window U-value (36mm) | Centre pane U-value | |
| 1.0 W/m2K | 0.5 W/m2K | |
| System 17 SP | 1.19 W/m2K | 0.71 W/m2K |
Metal Technology can provide tailored U-value calculations using their dedicated estimating software to calculate overall project average window U-values for their full range of systems.
