After the Second World War, thatched roofs disappeared rapidly because of the decrease in population in farming areas made it difficult to jointly re-thatch roofs, introduction of regulations that complicated new buildings and the price of wood, such as Japanese cedar, temporarily increased and kaya-growing areas were converted to artificial forests.
第二次世界大戦後は農村の過疎が進み、共同作業として行う葺き替えが困難になったこと、規制等により新たに建造することが簡便ではないこと、また、スギなどの木材価格が一時的に高騰し茅場が人工林化したことなどから急激に姿を消した。