The floor plan is developed first (Figure – 1 ) because all the other drawings are related to it. It is often not completely finished until the other drawings are made because they sometimes will require adjustments in the floor plan. The floor plan is also important because it contains a large amount of information about the building and the other drawings depend upon it for their basic information.
A floor planis a section drawing made by cutting plane passing through the building with the upper part removed. In general is assumed to pass about 3 – 4 feet above the floor, but the actual cutting plane can be lowered or raised as needed to show the information desired. In a single story building it is assumed to pass 3 – 4 feet above the floor and in multistoried buildings it passes through each floor in this manner. When a room is two or more floors high this will be shown on the upper level floor plan and will be labeled ‘open’ on the lower floor plan. Split level buildings present a more difficult choice. The plane must raised or lowered to show each level. Split level buildings can be split left to right, right to left, front to back, back to front or have an entrance somewhere in between all of the various floor levels. A typical floor plan indicates the location interior partitions, plumbing fixtures and the location of electrical fixtures. All features are drawn to scale. Windows are drawn using symbols and doors are also drawn using symbols but show the direction of swing. All symbols used are shown in the legend.
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