背割り(せわり)とは?【建築用語・土木用語・大工用語】 背割り(せわり)とは、製材後の乾燥による亀裂を防ぐために、背の部分に割れ目をつくる製材工法のことをいいます。 Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window