Some of the key units in architecture's metric system include: In architecture, the metric system includes various units of measurement that are commonly used. Figure 4.5 shows examples of drawings drawn to 1:50 and 1/4 inch = 1 foot, 0 inches scales. Drawings produced in metric, such as floor plans, elevations, and sections, are normally drawn to a scale of 1:50 or 1:100, as opposed to the 1/4 inch = 1 foot, 0 inches or 1/8 inch = 1 foot, 0 inches scale used in the imperial system.
When reading metric dimensions on a drawing, all dimensions within dimension lines are normally in millimeters, and the millimeter symbol (mm) is omitted unless more than one dimension is quoted, in which case the symbol (mm) is included after the last dimension. Figure 4.6B A drawing of a counter detail drawn to a metric scale of 1:10. Thus, construction members that are spaced 24 inches on center (O.C.) in the United States translate into 600 mm O.C. In countries that have adopted the metric system, the dimensioning module is 100 mm, whereas in the United States architectural design and construction modules normally used are 12 or 16 inches. Using the same method, the length and width of sheet of plywood change from 48 x 96 inches to 1200 x 2400 mm. Ric units, 5/8 inch thick equals 17 mm and 3/4 inch thick equals 20 mm.
When measuring plywood thickness in met- Figure 4.6A A drawing of a stair detail drawn to a scale of 1 1/2" = 1'-0". This method is far more convenient when drawing plans and measuring in construction. Thus, 2-x-4 lumber is 40 x 90 mm using soft conversion. The preferred method of metric dimensioning is called a soft conversion, in which common metric modules are used. Scale on drawings is to be shown by a ratio (1:1, 1:10, 1:50, etc.). No periods are used after the unit symbols.Ĥ. Figure 4.5B A drawing showing scales in metric (1:50).ģ. Plot plans and site plans are to be dimensioned in meters (m) or possibly kilometers (km), depending upon the scale, with accuracy to only three decimal places.įigure 4.5A A drawing showing scales in imperial (1/4" = 1'-0").įigure 4.5A A drawing showing scales in imperial (1/4" = 1'-0"). Architectural working drawings are to be dimensioned in millimeters (mm) and meters (m).Ģ. The American National Metric Council, in its publication American Metric Construction Handbook, recommends the following with reference to metric drawings:ġ. According to the American National Standards Institute (ANSI), the International System of Units (SI) linear unit commonly used on drawings is the millimeter.
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