出师不利

如题。是否有一个规范？

谢谢！

jammy

In the middle of the floor is allow a bit lower than the wall side, I am not sure, may be 12 feet can be lower 1 quarter inch. But because when we but the house or floor already flow the code using 2 by 8 in 16 inch, expansion about 10 feet, so we don't need to worry about the floor down a bit as long as we flow the code to make it level.