'Open formwork' is the fourth of nine thin-walled substructures, which are considered as 'special facades' at FassadenGrün. On this page, such formworks are examined in more detail, and illustrated by examples, which of the eight attachment (anchors) variants, also mentioned in 'special facades', are suitable here. The site is designed to help you select suitable wire rope technology for your wall cladding. Please note: In some climbing plants structural damage occurs when they grow into the columns of wall formations!
'Open formwork' is increasingly being used in architecture and consists mostly of horizontal, strong square profiles (30 - 40 mm thickness), which are laid without 'tongue and groove', i.e. not 'in composite'. The resulting joints are designed to be extra wide as 'visible gaps' and thus as design elements. The wood profiles are usually beveled in a rhombus shape, to promote water drainage from the wall, hence the names 'rhombus formwork' or 'trapezoidal formwork'. In a broader sense, all the boards and slats laid with an open joint are included in this category, i.e. even the simplest, vertical slatted fences, semi-finished profiles, bamboo facades, etc. For subsequent attachments, we recommend our drill cartridge UB 77777.
Open formwork is less stable than in formwork (with 'tongue and groove'), they do not act statically as a 'panel' and cannot absorb such high bending plant loads. The stronger or thicker a rhombic formwork is, the higher its load capability. For the load estimation, it is practical to apply the expansion limits of the cables, e.g. 250 kg load with a 3 mm cable. Heavy and massive kits (4 mm rope) are not recommended.
For the attachment of the cable brackets, all variants are possible up to variant 07, and if possible, the optimal variant 05 (fastening in outer shell AND behind lying lattice) is to be preferred. In other variants, the points of the cable brackets should be as close as possible to the substructure, since the slats of the outer shell are particularly vulnerable to deformations in the middle between two fastening strips located underneath. If this is observed, variant 03 (through-hole fastening) and variant 01 (direct fastening in the outer shell) are also suitable, but then the connection points outer battens / substructure are to be reinforced by additional screws or nails.
Even variant 02 (Hollow cavity rawl dowel) can be suitable for rhomboid formwork, but it must be ensured that the galvanized parts of the dowels do not come into contact with water on the inside of the formwork or that there is also no condensation water because otherwise corrosion occurs.