Floor
The framing crew is the next group of people on the site. They start by building the floor (unless the house uses a slab foundation, in which case the slab is the floor).

The floor framing looks like this >>

The floor starts with a sill-plate made of pressure-treated lumber in direct contact with the bricks or cement walls of the foundation. Then the floor is constructed on the sill with 2x10 lumber:

Once the floor framing is complete, it is covered with 1/2-inch or 5/8-inch plywood or OSB (oriented strand board).

And the floor is finished.