The main bar is also called a waiting list span bar normally used at the base of the slab having place 4 heights between the two bars.
The main bar is also called pressure steel because it is given in the force zone of the roof slab in the base having the soft power of steel is enough to submit power and final tensile power.
We should use his soft steel in the main bar Fe 550D.
Enough quantity of the main bar used in small management having 10 mm or 12 mm of steel bar in accord with to ceiling slab.
Span bar called a lengthy cross bar chiefly used at best of the main bar in the squeezing zone of the piece, span bar is normally an 8mm or 10mm bar steel bar lasting management according to the ceiling slab process.