What's in a Concrete Floor?

Once graded to level, gravel is placed 6-10 inches deep around the footers and masonry. Plumbing supply lines, electrical feeds, and other conduit is sunken into the gravel base ahead of the concrete pour.

Water barriers are then laid on top of the gravel. Steel web or grids are placed as reinforcing and forming support on top of the vapor lock.

Expansion boards are placed along all masonry to allow for expansion and contraction of the poured concrete.
This photo shows the poured concrete floors to the right. These areas are inside of classrooms and will be covered with a floor covering. The middle is the hallway and has yet to be poured. It will be a colored concrete.
Around columns a form is built and expansion or "isolation" joints are poured. In theory they allow the column to move without cracking the floors.
These are examples of the possible color stains for the concrete. This is a sample pouring for study.
At this time, they are unfinished and raw. They have not been sanded or polished. A team of teachers and BOE members will help make the decision on the final colors.