Further down the supply chain, timber-dealers and factories are often certified largely on the strength of documents which may be illegally bought.

Wood density and mechanical properties were rapidly decreased with the increasing decay for larch and pine timber, the most is MOR, then crushing strength, and the density is the smallest.

The experiment results indicate that the confining action of CFRP sheets can enhance the strength of timber column about 10 ~ 20%, and can also enhance the ductility of timber column.