But though concrete has been commonly found in ancient construction excavations, it was not used for modern foundations until the 1900s!

When was concrete first used for foundations?

The earliest known use of primitive concrete appeared in 6500 BCE. These solid structures were popularized by Nabataea traders in ancient Syria and Jordan. They were able to construct simple concrete foundations and floors, as well as rubble houses. Some of these structures still exist today.

What were old foundations made of?

Walls in older houses were made using bricks, and walls in very old houses may have been made using stone. Many foundations have at least one large horizontal concrete slab.