Type of member

Deflection considered

Deflection limitation

Flat roofs not supporting or attached to non-structural elements likely to be damaged by large deflections

Immediate deflection due to live load L

l/180

Floors not supporting or attached to non-structural elements likely to be damaged by large deflections

l/360

Roof or floors construction supporting or attached to non-structural elements likely to be damaged by large deflections

The part of the total deflection occurring after attachment of non-structural elements (sum of the long-term deflection due to all sustained loads and the immediate deflection due to any additional live load)

l/480

Roof or floors construction supporting or attached to non-structural elements not likely to be damaged by large deflections

l/240