Concrete block stairs can be built out of concrete
blocks, mortar and even wood. (See picture below) Concrete blocks also
come in different shapes and sizes and are normally bonded together with
mortar.
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Some concrete blocks don't require mortar, but it
would be difficult to build a stairway, without some type of concrete or
cement.
If you're going to build a set of stairs with concrete blocks, plan on
cutting a few of them. These blocks are normally 8 inches tall and most
building code riser requirements are less than 8 inches.
If you could examine the picture above, close enough, you will notice
that some of the blocks have been cut underneath the stair treads.
Stair Building Tip: I've seen plenty of stairs built with concrete
blocks that haven't been cut. It's definitely easier to build a set of
stairs out of blocks, without cutting them, but they might not meet
local building codes.
An 8 inch stair riser doesn't provide most of us with a comfortable step
and should be avoided if possible
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