The necessary precaution to be taken while marking layout on ground are as follows

1. All vertical wooden post should be firmly fixed into the ground with concrete and curing should be done to the concrete work for the period of 7 days before fixing horizontal railing.

2. Horizontal wooden planks called as railing should be straight and should have standard size.

3. Joints of the wooden railing should not be overlapped but should be joined by small wooden planks on either side of joint and nailed properly.

4. All vertical post should be kept generally at the same level

5. Horizontal wooden railing should have same level throughout and leveled should be found either by level tube or dumpy level.

6. Railing should be fixed by the nails of 50 mm in dia.

7. Nails of 40 mm in dia. Should be used for locating the center of column in framed structure and locating the centre of masonry wall in load bearing structure

8. A diagonal check should be done for every day work while locating the centre of column.

9. Strict instruction should be given to the staff and labours not to sit on railing such that bending of railings avoided and it helps for better accuracy

10. Periodical checking should be done by measuring distances of each rail from the face marking or origin

11. Position of nails on the horizontal railing should not be disturbed till the completion of the plinth work

12. All column number i.e. C1, C2, C3 etc. marked on wooden railing should be visible.

13. All the work should be certified by RCC consultant and Architect

14. To prevent the lime powder flowing away with wind action, it should be thoroughly mixed with sand.

15. Marking with lime powder should be clear and distinct to excavate the pits and trenches properly by labour.

16. Measure or check all distances by steel tape.

17. Prepare the location sketch of reference markings.

18. Mark the face line or center line correctly.

19. Use proper or correct plumb bob for centering.