Reinforcement shall be accurately placed and adequately supported before concrete is placed, and shall be secured against displacement. The formwork should be set accurately to the desired line and levels should have plane surface.The material of the formwork should be cheap, easily available and should be suitable for reuse.Construction of formwork should permit removal of various parts in desired sequences without damage to the concrete.The joints in the formwork should be tight against leakage of cement grout.Strong enough to withstand all types of dead and live loads - Rigidly constructed and efficiently propped and braced both horizontally and vertically, so as to retain its shape.Reusable forms are known as panel forms and non-usable are called stationary forms. The operation of removing the formwork is known as stripping. The construction of formwork takes time and involves expenditure up to 20 to 25% of the cost of the structure or even more.
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