Purposes of Construction notes –
1) These include additional information about the structure which can not be shown in drawing.
2) These are useful for better understanding of drawing.
3) To give idea about any special work.
4) To know materials, finishes, thickness, proportions, etc.
5) To avoid any confusions.
6) To provide information about finishing work, especially like flooring, colouring, pointing, ornamental work etc., which is difficult to show in drawing.