ハウスメーカー住宅における木質材料の選択と住宅工法の合理化

概要

論文の詳細を見る
Most Japanese builders use laminated lumber for structural members. Major companies in the Japanese housing industry consider glulam (laminated lumber) completely seasoned wood. Glulam has therefore been replacing green lumber for columns, but some kiln dried lumber is still used as before. The use of glulam is almost equal to that of kiln dried lumber. Glulam beams are not as widely used as columns, since it is not necessary for beams to be completely seasoned. However, glulam beams used for parts to be especially heavily loaded are more valuable than dimension lumber. One reason is that recently the quality of dimension lumber, to be used for beams wider than 300mm or so, has declined. Another is that, for similar requirements in construction, the dimensions of glulam beams are smaller than those of ordinary wood, reducing the variety of lumber sizes. Glulam and some kinds of ordinary wood are almost equivalent, and the choice of material therefore depends on housing builders' preference, based on their own strategies. These circumstances, however, may change with the present development of improved wooden constructions that require more strictly seasoned wood. If this method of construction becomes popular in Japan, then subtle differences in the water content of structural members, both columns and beams, will be of greater importance, and the use of glulam will increase and exceed that of ordinary wood.
林業経済学会の論文
1998-03-20