Stripping Time of Formwork as per IS 456: A Detailed Guide
Stripping Time of Formwork as per IS 456: 2000 The stripping or removal of formwork in concrete construction is a critical step, as it ensures that the concrete has attained sufficient strength to bear its self-weight and any additional loads. The Indian Standard IS 456: 2000 provides clear guidelines on the duration for which formwork should remain in place before being stripped, depending on the structural element and span length. Clause 11.3.1 of IS 456: 2000 – Formwork Removal Guidelines The recommended time frame for removing formwork are based on standard curing conditions (use of Ordinary Portland Cement at normal ambient temperatures). Below are the specified stripping times: 1. Vertical Formwork for Columns, Walls, and Beams Minimum Stripping Time: 16 to 24 hours after casting. Reason : Vertical members like columns and walls do not bear significant load immediately and can safely support themselves once the concrete sets. 2. Soffit Formwork (Bottom Shuttering) for Slabs Minim...