Question

The minimum period before stripping the formwork for props to slabs spanning 6 m is
1. 16 - 24 h
2. 3 days
3. 7 days
4. 21 days
5. 14 days

Answer 1

Correct Answer - Option 5 : 14 days

As per IS 456: 2000 clause 11.3,

Type of Formwork	Minimum period before
Vertical formworks to columns, walls, and beams	16-24 hrs
Soffit formworks to slabs	3 days
Soffit formworks to beams	7 days
Props to the slab for spanning up to 4.5 m	7 days
Props to the slab for spanning over 4.5 m	14 days
Props to beams and arches spanning up to 6 m	14 days
Props to beams and arches spanning over 6 m	21 days