According to Central Building Research Institute, what is the specification adopted for the floor of single and double-storey buildings?
1
40-mm-thick cement concrete 1: 3: 5 laid over 11.5-cm-thick cement concrete 1: 5: 10
2
30-mm-thick cement concrete 1: 3: 5 laid over 11.5-cm-thick cement concrete 1: 5: 10
3
38-mm-thick cement concrete 1: 2: 4 laid over 11.5-cm-thick cement concrete 1: 5: 10
4
38-mm-thick cement concrete 1: 4: 6 laid over 11.5-cm-thick cement concrete 1: 5: 10