Arch Detailing Notes

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Architectural Detailing Notes
  Lines and Line Quality Basically, lines can be broken down into three types: light, medium, and dark. Light Lines. The lightest lines used are usually the guidelines drawn to help with lettering height. These lines should be only barely visible and should completely disappear when a blue print is made. Darker than guidelines but still relatively light are the lines used in dimension and extension lines, leaders, and break lines. Medium Lines. Medium-weight lines are used in object and center lines, and in the dashed type of line used for hidden or dotted lines. Dark Lines. The darkest lines are used for border lines and cutting plane lines, major sections, and details. Choosing Line Quality. Line quality depends on the use of that particular line. An intense line is used to profile and emphasize; an intermediate line is used to show elements such as walls and structural members; and a light line is used for elements such as dimensioning and door swings. Another way to vary line quality is to increase the width of the line. A thicker line can represent the walls on a floor plan, the outline of a building on a site plan, or the outline of a roof on a roof plan.  Hidden or Dotted Lines. Hidden or dotted lines are used to indicate objects hidden from view. Solid objects covered by earth, such as foundations, can be indicated with hidden lines. This type of line can also depict future structures, items that are not in the contract, public utilities locations, easements, a wheelchair turning radius, or the direction of sliding doors and windows.  Arrowheads . Different types of arrowheads are used in dimensioning. The top one is used architecturally more for leaders than for dimension lines. The second one with the tick mark is the arrowhead most prevalently used in our field. The dot is used in conjunction with the tick mark when you are dimensioning two systems. For example, the dot can be used to locate the center of steel columns, and the tick mark can be used to dimension the secondary structure within a building built of wood. The final wide arrowhead is used as a design arrowhead in many offices.  Material Designation Lines. Material designation lines are used to indicate the building material used. For example , cross-hatched lines between the parallel lines that represent the wall thickness. These diagonal lines represent masonry.
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