Do you have a cement board with a small double middle compartment?
And the beam around the beam of concrete strength grade and so on, it should be considered, generally not less than C.
So the choice of 120mm thick, thickness and the live load on the board, the board should meet the requirements of cracks and deflection, concrete grade and environmental category
Yes, the first board for the two-way board, plate thickness for the short span of 1/40 ~ 50, you can use 90 ~ 112.5mm thick
