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.
Purposes of North direction –
1) For orientation of Building.
2) It helps in planning of various units and their placement.
3) To keep uniformity in drawing with common reference direction.
4) To avoid discrepancies in understanding of drawing.