Formwork
- Keep centering supports (ballies/props) truly vertical and brace them in both directions. Ensure that the supports have a firm base.
- Ensure that the spacing of supports does not exceed 1m, centre to centre.
- Seal the joints of the centering plates with mastic tape.
- Gently coat the surface of the formwork with grease or shutter oil.
- Remove dust particles like sawdust, chippings and paper pieces from the formwork before placing concrete.
- Follow this order while removing the formwork – Remove the shuttering of vertical faces of walls, beams and column sides first, followed by the bottom of slabs and then the bottom of beams.
- Keep the shuttering for a minimum of 24 hours for vertical faces of column, walls and beams.
- For slabs up to a 4.5m span, keep the supports for 7 days; for those over 4.5m, keep the supports for 14 days.