As a minimum 4 rebar 1 2 inch is spaced vertically at 36 inches on center continued to within 8 inches of the top of the wall placed on the tension side the inside face of the wall.
Using rebar and concrete in basement wall.
Spacing of rebar will vary with the type of wall and construction.
Designing a wall to prevent failure in bending requires a proper analysis of the soil loads and an appropriate structural design of the wall.
Concrete block can be laid with mortar between blocks or dry stacked and sealed with a surface bonding cement.
A sideways force against a basement wall puts one face of the wall in tension see figure 1 next page and concrete s tensile strength is much lower than its compressive strength.
Rebar is recommended for concrete that measures 5 6 inches in depth.
The type of and intended use of concrete impacts the need for rebar reinforcement.
If your wall is over 40 feet long it will add 2x the amount of overlap required.
If your wall is over 20 feet long it will add the amount of overlap required.
Mortared block sometimes is reinforced with horizontal rebar laid in the joints as support against lateral pressure such as basement backfill.
This calculator assumes that you are using 20 foot long lengths of rebar.
Rebar is placed horizontally and vertically in the wall in a grid pattern.
If formed concrete not exposed to earth or weather.
Calculate the amount of rebar needed for reinforcing a wall.