Some foundations were being created of concrete blocks, and lots of building codes demanded the usage of masonry in fireplace walls. Concrete masonry units (CMUs) or blocks in a basement wall before burial Blocks of cinder concrete (cinder blocks or breezeblocks), ordinary concrete (concrete blocks), or hollow tile are generically https://www.yellowpages.com/brea-ca/mip/west-hills-masonry-21202769