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Fig. 29: Bresta edge-fixed element

Fig. 29: Bresta edge-fixed element

Fig. 30: Bresta edge-fixed elements

Different types of section

Fig. 30: Bresta edge-fixed elements

Different types of section

Bresta edge-fixed elements

Structure

Side boards 30 mm thick, a cheap (waste) material readily available from any sawmill, form the basis for these elements. The boards are placed on edge and joined with continuous dowels in a fully automatic production plant. The hardwood dowels hold together the "stack" of boards through a clamping effect. Neither glue nor mechanical fasteners are used. This method can produce one-way-spanning elements in any width with thicknesses between 8 and 12 cm for walls, and between 18 and 26 cm for floors, depending on the span. The dowels perpendicular to the direction of the boards ensure that the transverse shrinkage and swelling movements are reduced virtually to zero.

Design process

The design is not bound by any production-related module. The project can be designed as required and subsequently divided into elements in conjunction with the manufacturer. Openings can be cut virtually anywhere in the panels.

In comparison with lightweight construction, the mass of an edge-fixed element results in a higher heat storage capacity. Such elements are ideal for timber-concrete composite floors. Narrow elements (27 cm) can be supplied for conversion work where space is limited.

Loadbearing behaviour. Element spans in one direction. Shaping: The elements can be bent transverse to the boards (barrel-vault roofs are possible).

Applications: Walls, floors and roofs

Facade: A compact facade structure requires the addition of a vapour barrier. If the inner surface is not lined, the vapour barrier can be fitted between the element and the insulation.

Insulation: The insulation is attached externally.

Surface finish: Rough-sawn boards are dowelled together if the surface is to be clad afterwards. On exposed surfaces the boards are planed on four sides. The dimensions of the boards can be varied to suit aesthetic and acoustic requirements (see fig. 30).

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