Used to indicate the central axis of a building element.Īlternating long and short dashes the same width as hidden lines. Short dashes that are half the width of object lines. Reveals building object surfaces hidden from view when seen in person. Indicates the sides of a building element that would be visible to a real-life observer.Ĭompletely solid, and the thickest lines found on a blueprint. If you need any help understanding blueprint symbols, here’s a quick cheat sheet covering the most common lines found in blueprint drawings: Practice, ideally backed up with some formal blueprint reading training, will help you learn what each type of line means. The most daunting aspect of blueprint reading is deciphering the many lines that make up the drawing. Blueprint sets will also include specification sheets, which offer in-depth descriptions of all materials used during construction.
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