Floors Level or Sloping Only Toward the North-East
The earth cooled from a ball of fire and tilted about 23.4 degrees toward the North-East, so a floor that is level or falls gently toward the North-East is in harmony with nature. An uneven floor, or one sloping any other way, is one of the biggest defects whatever the zone.
Spirit level
Floors of all rooms, toilets and bathrooms; slope of the plot