Concrete block foundation

This photo was taken in the crawlspace of a 20 year old foundation. The crawl was dry with a few spots of efflorensce, and water stains only.

As you can see there are no mortar joints. The walls were plumb and no signs of distress.

I assume that the hollow core has been filled with grouting in lieu of mortar joints?

Can’t ever remember seeing a foundation constructed in this manner.




In the 1970’s, there was a block system promoted in which the block was stacked and the surfaces were parged with fiber reinforced mortar for strength.

Thanks Brian, good links.


Were they ‘hollow’?

I remember hearing about dry stacked block, filled with rebar and concrete. For a clean finish, and solid design.



They were hollow, then filled with concrete.