The code requires factored loads (1.2D + 1.6L). The PCA Notes show you the metric workflow . For example:
Metric deflection limits are ℓ/240 , ℓ/360 , or ℓ/480 . The PCA Notes include a that is easier to read than ACI’s Table 7.3.1.1. It directly gives thickness in mm for simply supported, one-end continuous, both-ends continuous, and cantilever. pca notes on aci 31814 metric pdf exclusive