Some local building codes may require that you anchor concrete steps to the foundation wall.
How to build concrete stairs against a wall.
The first step no pun intended is to mark out the area where the steps.
Use a masonry bit to drill through the 2 x 4 and into the concrete floor then attach the 2 x 4 to the floor with concrete nails.
There should be a slope but this will not always be the case such and when the steps are up to a patio and are against a wall.
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With an underlying grid of 1 2 inch rebar poured concrete steps will give you years of low maintenance service.
Building concrete steps requires a knowledge of mixing and pouring concrete making concrete forms and using tools like hammers drills levels and so on.
Fit the treated 2 x 4 into the notch and press it flush to the wall.
Position one stringer against the wall and have a helper hold it in place.
Having done both if the stairs figure out to more than 20 bags of concrete i would suggest calling a redi mix concrete company.
You can either drill at an angle into a poured concrete foundation or through a concrete block wall and insert rebar in the holes.
Building concrete steps can be done by mixing the concrete from bags you buy or calling a redi mix concrete company and having them deliver the concrete pre mixed on a concrete truck.