Can minka survive with the change of environmental regulation?

民家は環境規制の変化に生き残れますか？

 

性能表示、温熱環境、省エネ対策等級
等級２、等級３、等級４

 

drawit-diagram

 

Energy efficiency of exterior wall
外皮の省エネ性能

energyConservationRegulation

http://www.mlit.go.jp/common/000996591.pdf

In Heisei 11, floor area is used for heat loss coefficient (Q)

In Heisei 25, total exterior surface area is used instead to calculate the coefficient of overall heat transmission

According to the survey done by Japan Minka Association, the construction of earth wall does not meet the regulation standard, while the insulation of the roof structure has the insulation function that meet the standard.   However, the overall coefficient of heat transmission fell below the standards.