In slabs and walls then of an inch is required.
Using rebar and concrete in basement wall.
If formed concrete not exposed to earth or weather.
Calculate the amount of rebar needed for reinforcing a wall.
Concrete block can be laid with mortar between blocks or dry stacked and sealed with a surface bonding cement.
Rebar is recommended for concrete that measures 5 6 inches in depth.
If your wall is over 20 feet long it will add the amount of overlap required.
Rebar must be placed at the center of or slightly above the center of the concrete slab hence why it should be a certain thickness for best results.
Mortared block sometimes is reinforced with horizontal rebar laid in the joints as support against lateral pressure such as basement backfill.
Spacing of rebar will vary with the type of wall and construction.
In general rebar in residential construction needs to have 3 inches of concrete cover or separation from soil when the concrete for footings and pads is poured against soil and if poured against forms 1 inch.
Designing a wall to prevent failure in bending requires a proper analysis of the soil loads and an appropriate structural design of the wall.
If your wall is over 40 feet long it will add 2x the amount of overlap required.
Rebar is placed horizontally and vertically in the wall in a grid pattern.
This calculator assumes that you are using 20 foot long lengths of rebar.