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As per ACI
1-flat roofs immediate deflection due to live load = L/180
2-Roof or floors attached to non structural elements (not) likely to be damaged by large deflections due to long term deflection (dead loads+ the sustained part of live loads+creep+shrinkage effection) = L/240
3- if the roof attached to glass or cladding or Gypsumboard No.2 will be = L/480
Deflection shall not exceed span/250
Flat roofs not supporting or attached to non-structural elements likely to be damaged by large deflection.
Immediate deflection due to the live load.
L/180*
