Permissible Differential Settlements

Permissible Differential Settlements and Tilt (Angular Distortion) for Shallow Foundation in Soil (As Per IS 1904- 1986)

SL. NO.

Type of Structure

Sand & Hard Clay

Plastic Clay

Max. Settlement

Differential Settlement

Angular Distortion

Max Settlement

Differential Settlement

Angular Distortion

1 For steel structure

50

0.0033*L

1/300

50

0.0033*L

1/300

2 For reinforced concrete Structure

50

0.0015*L

1/666

75

0.0015*L

1/666

3 For multi-storeyed buildings

a).RC/Steel framed buildings with panel walls

60

0.002*L

1/500

75

0.002*L

1/500


b).For load bearing wall
i). L/H = 2+

60

0.0002*L

1/5000

60

0.002*L

1/5000

ii). L/H = 7+

60

0.0004*L

1/2500

60

0.0004*L

1/2500

4 For water tower/ silos

50

0.0015*L

1/666

75

0.0015*L

1/666

L – Denotes the length of deflected part of wall/raft or centre-to-centre distance between columns.

H – Denotes the height of wall from foundation footing.

For intermediate ratios of L/H, the values can be interpolated.

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