Concrete masonry unit.

If you have water inside the clay tile, its probably coming in through poor mortar joints between the units.

Fortunately you have room to add brick it looks like when you can afford it.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.