De – Shuttering Period as per IS 456 – 2000
De shuttering period relates to the maturity of concrete and depends on the ambient temperature.
Forms shall not struck until the concrete has reached strength at least twice the stress of which the concrete may be subjected at the time of removal of form work.
| Form | Summers | Winters (Temp <18° C) |
|---|---|---|
| Walls, columns and vertical faces of structural members | 24 hrs. | 48 hrs. |
| Removal of props under slab Spanning up to 4.5 m | 7 days | 14 days |
| Removal of props under beams and arches spanning up to 6 m | 14 days | 28 days |
| Soffit form work to slabs | 3 days | (props to be refixed after removal) |
| Soffit to beams props | 7 days | props to refixed after removal. |