DUO & 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. Certified according to SANS 1783-1 and SANS 1460.
Thicknesses: 60 - 240 mm
Width: 100 - 300 mm
Lenght: 11,95 m
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.
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.
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.
Rough sawn timber is kiln-dried to a moisture of 16 % (+– 2 %). Lamellas used in the production of glue laminated construction timber are kiln-dried to a moisture of 8 % (panels), 12 % (BSH, DUO/TRIO) and 15 % (KVH). Kiln-drying also destroys wood pests. As kiln-dried wood is not usually attacked by common wood pest species, European countries have adopted a technical and legislative opinion that such wood does not have to be chemically treated, which is an important step towards greater environmental friendliness of wooden constructions. However, kiln-dried timber can be treated when the customer requires it.