How to measure the quality of the wood:

The quality of the wood is evaluated depending on the faults that this one contains. The faults that diminish the resistances are basically:

Actually, it would be more correct to speak about singularities instead of faults of the wood, since the majority they answer to almost inevitable characteristics of the process of growth of the tree or of own sawed.

The evaluation of these faults is realized by means of the procedure of classification, that they change depending on the country. The methods of classification can be visual (today they are the more widespread) or mechanics, of more recent introduction, which allow to automate completely the process.

The development of new products with structural applications, is orientated to an elimination of the influence of the faults in the resistance of the wood. The laminated wood, when using sheets of small thickness, limits the influence of the fault to the thickness of the sheet. The microlaminated wood pursues the same effect, reducing the thickness of the sheets to a few millimeters. The plywood board adds to this objective, an average of its properties in the plane of the board, on being formed sticking sheets of wood in such a way that the fibers of two consecutive sheets form an angle of 90º.