How many material required for 660Sqft area slab casting🏠820Sqft🧱 sand, agreegate, steel, cement bag

How many material required for 660Sqft area slab casting🏠820Sqft🧱 sand, agreegate, steel, cement bags

in this video learn about roof and Slab,chhat steel Rods binding tips and process,how to calculate material required for slab area for roof casting process, sand, agreegate, steel, cement bags, how to calculate CFT
what is CM cubic metre
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Crank length, Crank mejarment, Main bar Distribution bar Crank how to bend
slab rod space C/C,10mm5&8mm6provide clear shapeness rod binding slab Area670sqft slab with beam 820Sqft area