DUO/TRIO is glued from two or three solid timbers. Provides optimum dimensional stability, for instance in airtight building envelope constructions and where stringent demands are made on design. The low number of glue points helps retain the solid wood character of the material. DUO/TRIO is just as easy to process as solid wood. Special benefits: A top-grade crack-resistant surface and free-of-heartcentre cut for precise fitting and dimensional stability. Careful drying does away with the need for chemical wood preservative. The demands and requirements of building owners and planners have increased considerably in this day and age. Above all in the visible areas, qualitities without cracks and high-quality qualities are required, which should have chemically untreated surfaces.