Which wall is taller in the north or south

Do you mean traditional Chinese dwellings? The difference is that some of the north less rain, so the roof is low and flat; the temperature is lower, so the walls are thick and compact, pay attention to keep warm. And the south is rainy, so the roof is steep, conducive to rain drainage; the weather is hot, the air is humid, so the walls of the house is slightly thin, the house is tall, conducive to ventilation.

So relatively speaking, the southern building is taller, higher walls, of course, this is just a relative is, generalizations, the specifics have to be specifically analyzed

ps: I wrote, sorry for the shortcomings