Description and main purpuse of use

DUO and TRIO

The two- or three-ply (previously finger-jointed) laminated kiln-dried wooden components have higher visual quality thanks to lamination on the outer side of the beam. A premium building material with the look and feel of solid timber. Lamellas are horizontally laminated.

Product description

Duobalken and Triobalken (Dupo/Trio) laminated beams were developed to achieve larger cross-sections than KVH. They are industrially manufactured products made of two or three planks of timber glued together by their flat side with the fibres running parallel. This way of gluing, in the combination with the low wood moisture content, results in a product which is even less susceptible to dimensional changes and cracking than KVH structural timber.

Production

The timber used for production of Duo/Trio beams is sorted according to European standards and it is produced in two basic cross sections (80 x 280 mm and 100 x 120 mm). After sorting, wood elements are kiln-dried to residual moisture content of 12% +/- 2%, which guarantee the dimensional stability, little propensity for cracking and durability against attack of wood-destroying fungi. Dried lamellas are provided with finger joints and glued together with melamine adhesives. The surface of beams is planned and the edges are chamfered.

Utilization

Glued solid timber is only permitted to be used in Service Classes 1 and 2 (interior room climate or external climate under roofing). They are particularly well-suited to handle increased static loads. Examples in modern timber construction are when used as rafters, ceiling beams and uprights.

BSH

The multi-ply laminated kiln-dried wooden components are a modern construction material, characterized by high bearing capacity and a good dimension stability. An ideal alternative to steel. Variety of dimensions, better structural values than Rough sawn timber or KVH. Lamellas (4 cm thick)  are vertically laminated.

Production

The raw material (usually spruce) is kiln-dried and strength graded. The laminations are cut to the required length and placed on top of each other. To reduce internal stresses the laminates are turned so that the core sides face the same way throughout the cross-section. The outermost laminates are however always turned with the core side outwards. After longitudinal gluing using finger joints the flat sides of the laminates are planed and immediately glued. Then the pressure is applied. The laminates may be bent when the pressure is applied, producing cambered or curved forms.

Utilization

Glued laminated timber elements are designed for statically loaded timber structures, even with the possibility of use in the third service class. In this case, some surface treatment is recommended. The application of glued laminated timber is such as roof trusses, joists, girders, beams, columns, constructions of bridges, footbridges, lookout towers and other external structures.

Typical dimension

DUO and TRIO

Thicknesses: 60 - 240 mm
Width: 100 - 300 mm
Lenght: 11,95 m

Certified according to SANS 1783-1 and SANS 1460.

BSH

Thicknesses: 120 - 1600 mm
Width:  80 - 280 mm
Lenght: 11,95 m

Certified according to SANS 1783-1 and SANS 1460.