Drawings ~ these are the major means of communication between the designer and the contractor as to what, where and how the proposed project is to be constructed. Drawings should therefore be clear, accurate, contain all the necessary information and be capable of being easily read. To achieve these objectives most designers use the symbols and notations.
Hatchings ~ the main objective is to differentiate between the materials being used thus enabling rapid recognition and location. Whichever hatchings are chosen they must be used consistently throughout the whole set of drawings. In large areas it is not always necessary to hatch the whole area.
Symbols ~ these are graphical representations and should wherever possible be drawn to scale but above all they must be consistent for the whole set of drawings and clearly drawn.
Drawings Using Hatchings and Symbols