The foundation is often viewed
as the most important part of a dwelling since it supports the entire
home, and its contents. Cinder concrete blocks are
commonly used for housing foundations and porch
foundations. There is some controversy about using
cinder blocks over poured concrete for basement foundations, but
a key realization is that concrete block is made from poured concrete.
The main ingredients in concrete block and poured concrete
is sand, Portland cement, and gravel. The only difference
between the types of concrete is the size of the gravel used in
the mixture. The concrete block mixture uses a much smaller
The typical concrete block foundation is not solid
since the concrete blocks that are used to build block foundations
are hollow. When concrete blocks are stacked on top of one
another, you can look down through the center of the foundation.
After the concrete blocks are laid, the voids can be filled with
a cement-based mortar or poured concrete that contains small pea
gravel to make the foundation walls nearly identical to poured concrete
walls. Also, the presence of reinforcing steel dramatically
increases the overall strength characteristics of masonry or concrete.
Lastly, remember that a concrete wall is not waterproof
unless a waterproofing system is applied, such as parging.