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Concrete stair footings provide additional support for your stairway.
Now you're probably wondering, how would anyone know how wide or deep to
make these concrete foundation supports.
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Have
you ever wondered what goes under a structural wall in a concrete
building foundation? Take a look at the picture on your right and you
will notice some large holes, that someone dug out of the ground. These
holes are eventually going to get filled up with concrete.
A structural engineer provides the builder with all of the necessary
information to build the concrete foundation, including the dimensions
for the concrete stair footing. If you notice, they used reinforcing
materials, otherwise known as rebar to add even more strength to the
buildings foundation.
 Some
stairways are extremely heavy and if they were built without any
structural supports, the foundation could start to sag. That's right,
eventually the concrete slab would start to sink into the ground,
creating additional problems for the building.
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