What is the allowable deflection of flat slabs ?

Question

Mohammad Afify · Answer

For slabs = Span/250
For beams = Span/360
For cantilevers = Span/450

According to Egyptian code

Nader Ali · Answer

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

Ahilan R · Answer

Deflection shall not exceed span/250

Muhammad Yousaf · Answer

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*

Ahmed Hassan Mohamed Ahmed · Answer

It depends on the code requirements. But defect can be controlled by limiting cracks to .3 mm width as per BS

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What is the allowable deflection of flat slabs ?

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