This tendency is true at the present days, so more houses in northern Japan have metal plate roofing (a roof tile bar (semi-circular battens used for roofing) and flat roof tile (such as a straight line), etc.) and slate roofing.
これは現代でもみられる現象で、北日本の家屋では金属板葺き（瓦棒・平板（一文字など）など）、スレート葺きなどが多い。