The minimum slab thickness is controlled and reported automatically according to Codes for flat slabs.

The minimum slab thickness is controlled and reported automatically according to Codes for beam-to-slabs.


International Design Codes

ACI 318-19 : Two-Way Slab Design Limits

TSC 2018 : Punching Shear Stress at Critical Section (7.11.8)


Symbols in ACI 318-19

h = overall thickness, height, or depth of member, in.
ln = length of clear span measured face-to-face of supports, in.
fy = specified yield strength for nonprestressed reinforcement, psi
αfm = average value of αf for all beams on edges of a panel


Minimum slab thickness

There are two different slab thickness limits according to flat slab and beam-to-slab.

Flat slab thickness limit

Beam-to-slab thickness limit

Calculated deflection limits