First introduced in the UK by Allan Brothers in 1979, this window system has since been improved through both design and experience, and is now a tried and proven high-performance product. Recent improvements are design and performance related and include an attractive internal mould on both sash and frame, and an improved glazing system.
As standard, the windows are made from high-quality redwood. A hardwood option is also available.
The windows are treated with preservative after all machining. This is applied by means of a double vacuum process in accordance with BS 8417 and NHBC recommendations. The companys water-based coatings are formulated to seal the end-grain against moisture ingress and inhibit tannin staining.
Tested independently and approved to BS 6375 Part 1, the following ratings were achieved:
Air permeability: 600Pa
Water tightness: 300Pa
Wind resistance: 3000Pa
Minimum glazing rebates of 47x20mm on the sash allow a fully drained and vented system with an end-capped, polyester-coated aluminium bottom bead. 28mm (4/20/4) Softcoat Low E double glazed sealed units are factory fitted as standard. Specialist glass units, including anti-sun and leaded, can be fitted on request. A range of glazing bars and astragals are also available on request.
Using the Spilka hinge system, sashes are fully reversible but do not protrude into the room and therefore do not impinge on curtains or blinds. A safety restrictor is incorporated on the hinges of all sashes. An anti-blowback device is also available.
As standard, the windows are made from high-quality redwood. A hardwood option is also available.
The windows are treated with preservative after all machining. This is applied by means of a double vacuum process in accordance with BS 8417 and NHBC recommendations. The companys water-based coatings are formulated to seal the end-grain against moisture ingress and inhibit tannin staining.
Tested independently and approved to BS 6375 Part 1, the following ratings were achieved:
Air permeability: 600Pa
Water tightness: 300Pa
Wind resistance: 3000Pa
Minimum glazing rebates of 47x20mm on the sash allow a fully drained and vented system with an end-capped, polyester-coated aluminium bottom bead. 28mm (4/20/4) Softcoat Low E double glazed sealed units are factory fitted as standard. Specialist glass units, including anti-sun and leaded, can be fitted on request. A range of glazing bars and astragals are also available on request.
Using the Spilka hinge system, sashes are fully reversible but do not protrude into the room and therefore do not impinge on curtains or blinds. A safety restrictor is incorporated on the hinges of all sashes. An anti-blowback device is also available.
Key data
| Configurations | Top swing (reversible) windows |
| Glazing unit thickness (mm) | 28mm |
