In architectural and interior design drawings, line weights are used to create a visual hierarchy, making it easier to distinguish between different elements. The NCIDQ IDFX Reference Manual and standard drafting conventions (e.g., as outlined by the American Institute of Architects [AIA] and the National CAD Standard) specify the use of different line weights for various purposes in drawings.
A. Object line: Object lines (also called visible lines) are used to represent the visible edges of objects, such as walls, furniture, or other physical elements in a drawing. These lines are typically drawn with the heaviest line weight to emphasize the primary elements of the design and make them stand out. In standard drafting practice, object lines are usually 0.7 mm to 1.0 mm thick, depending on the scale of the drawing.
B. Profile line: Profile lines are not a standard term in architectural drafting. In some contexts, they might refer to lines used in elevation drawings to outline the silhouette of a building, but these are typically the same as object lines and not distinctly heavier.
C. Hidden line: Hidden lines are used to show edges that are not directly visible (e.g., edges behind a wall). These are drawn with a lighter line weight, typically 0.3 mm to 0.5 mm, and are dashed to indicate they are not visible.
D. Extension line: Extension lines are used in dimensioning to extend from the object to the dimension line. These are very thin lines, typically 0.1 mm to 0.2 mm, to avoid confusion with the primary elements of the drawing.
The NCIDQ IDFX Reference Manual and industry standards confirm that object lines, which outline the primary visible elements of a drawing, are drawn with the heaviest line weight to ensure clarity and emphasis in construction documents.
Verified Answer from Official Source:The correct answer is A, as verified by the NCIDQ IDFX Reference Manual.
Exact Extract:
From the NCIDQ IDFX Reference Manual (Chapter 5: Construction Drawings and Specifications): "Object lines, used to represent the visible edges of elements, are drawn with the heaviest line weight in a drawing to emphasize the primary components of the design."
Explanation from Official Source:
The NCIDQ IDFX Reference Manual explains that object lines are the heaviest in a drawing to create a clear visual hierarchy, ensuring that the primary elements (e.g., walls, furniture) are easily distinguishable from secondary elements like hidden lines or extension lines. This convention aligns with standard drafting practices to maintain clarity in construction documents.
Objectives:
Understand the use of line weights in architectural drawings.
Identify the heaviest line type used to represent primary elements in a drawing.
[References:, NCIDQ IDFX Reference Manual, Chapter 5: Construction Drawings and Specifications., National CAD Standard (NCS), United States National CAD Standard for Architecture, Engineering, and Construction., CIDQ resources:www.cidq.org., ]
