Because the climate in this place in Northeast China is too cold, the temperature can reach about MINUS 30 degrees Celsius at the coldest time. If the wall is too thin, cold air will directly penetrate into the wall. I remember when I was a child, there would be a thick layer of ice behind the living room at home, which was caused by the thin wall. Nowadays, a layer of foam insulation board is installed in the wall of self-built houses in rural areas, which plays the role of moisture insulation.
In fact, if you want to make your house warm in winter and cool in summer, the first thing to do is to lay the foundation deep enough and high enough to live in the north and south. Only by combining these two points can we build a house that is warm in winter and cool in summer.
In the northeast, there is no heating, so most families use kang to keep warm, so in this case, the tightness of the house must be better. The wall is too thin, even if foam insulation board is installed, it will not achieve effective results.
But now there is a new way to build houses in the north, which is to build houses with foam. Some people think that building a house with foam is not strong enough, but I think it is almost less. Just use foam modules to build the overall streamline of the house first, and then add steel bars and concrete in the middle of the foam. The effect is only to install the insulation board first and then build the wall, but there is one of the biggest benefits, which is good insulation effect and low cost.