Per Square

Dear Kiran Kumar

                   For roof of RCC 100 sft area and 6'' thick slab, the cement required is 8.5 bags for cement concrete 1:2:4 ratio.

Dear Gupta,

What is the ratio 1:2:4.

What is the ratio of sand and aggragte(in cft) for 1bag cement as per above ratio.

Renji

Dear Renji

         The ratio 1;2;4 means 1part of cement, 2 parts of coarse sand and 4 parts of bazri. i.e. coarse aggerigate.

Sir,

My question was for 1packet of cement how much sand(in cft) and bazri(in cft) required to make concrete in the ratio of 1:2:4? 

Thanks

Renji

Dear Renji

         It is very much clear that the ratio 1;2;4 means 1part of cement, 2 parts of coarse sand and 4 parts of bazri. i.e. coarse aggerigate, You can measure the all gradient by volume Or weight. As further clarification the 

1.  One cement bag = 1.25 cft so

2. Coarse sand       = 2.5 cft

3. Bazri/ stone ballast/ Coarse aggregate = 5cft(cubic feet) 

Thanks Gupta Sir for the clarification.

One more query , Is 1:2:4 ratio is idle for both flat and slope roof.

Renji

Dear

       The cement required for one sft of slab or roof is .1bags to .15bags as per thickness and ratio used in the slab.