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Interior design drawings contain huge amounts of information that is needed for other people involved in the project such as consultants, contractors, and builders. But all the information needed is hard to be illustrated effectively on the actual drawings. Symbols used to indicate doors, windows and electrical fixture indicate location only without any details. Elevations and sections can provide some information. But some information is best communicated in the form of written specifications, and other information in schedules.
A schedule refers to a tabular form with rows and columns of data to effectively organize information. They provide information that is shown in the plan as symbols. These are also a convenient way to conserve drawing space and drafting time. The information shown and the methods of organization vary depending upon the degree of detail wanted and the clearest way of showing this information. Schedules deliver more information than can be shown on the actual drawings, but not as deep information as in specifications. Schedules must be clear and easy to read. Although the format of schedules may vary among design firms, typical schedules are drawn in grid lines spaced either 3/16 or 1/4 inch apart, but no less than 3/16 inch for readability. The height of lettering is either 3/32 or 1/8 inch. Common types of interior schedules include finish, door, window, lintel, columns, beams, electrical, plumbing units, HVAC units, appliances and footing schedules.
Smaller buildings require smaller schedules and less time to do them, but larger and commercial buildings require extensive and more time and number of sheets. Schedule should be clear, concise, complete and easy to read and should specific and include all information needed by the builder to properly complete the project.
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