Therefore, flat surfaces are generally inclined a few degrees to aid water run off. The car is on a completely flat road, but the road is not level. The house in the background is level. In contrast, a level plane is one that is horizontal to the ground.

What does flat level mean?

Flat means no significant high or low spots In the tile world, the word “flat” means that the surface does not have any significant high or low spots and will yield a smooth tile installation with no lippage between tile edges. … The 10′ straight edge is used in all tile industry requirements to determine flatness.

What is a level floor?

According to the CTEF, “A level floor means it is parallel to the horizon. A level surface needs to be parallel to its perfectly horizontal plane. In order to determine if the substrate meets the required level plane, we again use the 10′ straight edge with the spirit level placed on top of the straight edge.”