two by four

Japanese: two by four(英語表記)twobyfour
two by four

…(1) There are only seven types of lumber cross sections, and when dried, their cross sections are 38×64, 38×89, 38×140, 38×184, 38×235, 38×286, and 89×89 (units in mm). Of these, the 38mm×89mm (2 inch×4 inch) cross section, which is mainly used for wall construction, is called 2×4 (two by four) in North America, and since it is the most widely used, this construction method has come to be known colloquially as the two by four method in Japan. The above cross sections are specified by JAS, and are in accordance with the North American lumber standard dimensions. …

*Some terminology explanations that mention "two by four" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…(1)使用する製材の断面はわずかに7種類で,その乾燥時の断面は38×64,38×89,38×140,38×184,38×235,38×286,89×89(単位はmm)。このうち,主として壁の構成に用いられる38mm×89mm(2インチ×4インチ)の断面が,北米で2×4(ツーバイフォーtwo by four)と呼ばれ,その使用量がもっとも多いところから,日本でこの工法をツーバイフォー工法と俗称するようになった。なお,上述の諸断面はJASで定められているが,北米の製材規格寸法と斉合している。…

※「two by four」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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