Wood is an organic material, produced by a large number of woody plants and quite variable in properties.Wood is naturally grown, and the variability within a species, due to genetic and environmental influences, issubstantial. In general, the variation for most wood properties (the ratio of highest to lowest for any property) ismore than 2:1.Wood has three cardinal directions related to the trunk of the tree. Parallel to the long axis of the stem is calledthe longitudinal (L) direction. The other two, radial (R) and tangential (T), are transverse to the stem of the treeand can be easily seen on the end of a log. These directions great that, if each was marketed separately, it wouldcreate an impossible situation. Before shipment lumber products are sorted at the mill into four broadcategories: appearance or finish grades, structural and construction grades, special purpose grades, and cuttingor industrial grades, are important because wood properties vary according to grain orientation. Woodperformance Properties are also affected by the presence of imperfections such as knots and pitch pockets. Thegrading process takes into consideration these imperfections, as well as defects that might occur inmanufacturing. Species and Commercial Groupings Wood performance is dependent on a wide range ofcharacteristics, the importance of which depends on how the piece is intended to be used. These characteristicsinclude the following: Strength, Stiffness, Hardness, Finish, Retention, Treatability with Preservatives andResistance to shrinkage swelling, warping checking weathering decay photo degradation color changes insectattackElsewhere. Of greater concern here are those properties that govern deterioration or changes in size and shape.Deterioration refers to the loss of the ability of a wood product to serve its intended purpose in appearance,strength, or other functions. The purpose might include, for example, providing a protective envelope orstructural support.1- What is your opinion for using wood as materials building structures?2- Are there variation for wood properties? And if there are, why?3- Explain about the wood dimensions?4- They sorted the wood according to what?5- What are the most important properties that must tested for wood?6- What are the disadvantage of wood using?

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1- What is your opinion for using wood as materials building structures? 2- Are there variation for wood properties? And if there are, why? 3- Explain about the wood dimensions?