Foundation wall

The foundation wall will be concrete and the foam blocks are used as forms for the concrete. The red spacers hold the sides of the foam together and it is also used to hold the rebar in place. These foam blocks are 12 inches high and 48 inches long and will hold 8 inches of concrete. They "snap" together like legos and are quite rigid when complete and ready for concrete. The long wall on the left side of the picture actually has a brick ledge formed in the foam that will hold concete to form the ledge.