BSP KWH hanging system is used for invisible mechanical fixing of cladding panels on both exterior and interior walls. Due to its thick elements system was designed for heavier cladding such as concrete and stone panels. System consists of BSP KW1 brackets (alternatively BSP KW1 PAS brackets), BSP KWRY profiles and hanging elements (BSP KWZ and KWH). All elements of BSP KWH system are made of extruded aluminium alloy EN AW 6060 T66 or EN AW 6063 T6.

BSP KW1 brackets are 4 mm thick. Their length (outreach) depends on cladding panels outreach and they are always chosen based on design and clients request. The size of a bracket depends on its type. Fixed brackets (load bearing ones) come in 150 and 120 mm versions, sliding ones (carrying only horizontal loads) come in 90 and 60 mm versions. There is additional aluminium piece on the side of the bracket that creates kind of a pocket that is used for fixing profiles and enables cladding leveling. All of the slots in the brackets were designed to ensure that aluminium expansion is possible. Brackets are fixed to buildings structure with anchors that are chosen based on static calculations. Pads/washers should be used together with the brackets to separate them from the wall or structure they are fixed to in order to avoid corrosion and decrease overall thermal conductivity. Recommended BSP pads are made of HDPE plastic material but alternatively PCV or EPDM ones can be used. BSP KW1 aluminium brackets are covered by the Technical Approval no. AT-15-9325/2014. They also have positive opinion of the Building Research Institute (ITB) regarding §225 of the Regulation of the Minister of Infrastructure regarding technical conditions that should be met by buildings and their location.

BSP KWRY is aluminium Y-profile used to connect both hanging elements (BSP KWZ and KWH). It is 2 mm thick and has 80 mm long side that guarantees high stiffness and enables large spacing of brackets. Front of the profile is 99 mm wide and width of the groove where KWZ elements are fixed is 55 mm. 4,8×19 A2 self-drilling screws are used to connect profiles with brackets.

BSP KWZ fasteners are fixed to KWRY profile in the mentioned groove on its front. Fasteners are 50 mm long and have small insets on sides to temporary lock them in place. Elements are 3 mm thick. KWZ is fixed either with standard or self-drilling screws which are selected based on static calculations.

BSP KWH hanging elements are fixed to the back of the cladding panel with under-cut anchors. Their high resistance is a result of 4 mm thickness. EPDM gaskets are placed in sockets. On top of load bearing element there is threaded hole in which the M5 adjustment screw is used. Panel is installed by sliding KWH hanging elements onto KWZ fasteners. By screwing or unscrewing the adjustment screw the vertical position of the panel is leveled.

All elements of BSP substructure system have B durability class in accordance with PN-EN 1999-1-1:2011 and may be used without any additional anti-corrosion treatment in environments of class C1, C2 and C3 according to PN-EN ISO 12944-2:2001. If additional protective layer is applied – anodizing – they can be used in environment of class C4. All elements of the system are also classified as A1 class in the scope of reaction to fire according to PN-EN 13501-1+A1:2010 based on the decision of the European Commission No. 96/603/EC,  2000/605/EC and 2003/424/WE.

BSP KWH system should be installed in accordance with the workshop design prepared by engineers and designers with sufficient knowledge in the field of construction and building. The layout of the structure and the spacing between the elements (strength and resistance of the entire system) should be confirmed by the static calculations prepared by the engineer with qualifications in the filed of construction and building.