Concrete
Marks concrete in a section or plan. The dots and small triangles are the conventional pattern for concrete.
This explains what a symbol represents on a drawing. Conventions vary between firms and standards, and a drawing's own legend takes precedence.
How to read it
The Army's print-reading manual lists concrete among its material conventions, the patterns that show what a structure is made of, and chooses each pattern to suggest a characteristic of the material where it can. The Navy's Builder Basic course shows the same conventional symbols for the common materials.
Also searched as: concrete hatch, concrete pattern.
Look-alikes
Earth and brick have their own patterns. Concrete masonry units have a separate one in the Army manual.
More blueprint symbols
Sources
- Construction Print Reading in the Field, TM 5-704 / AFM 85-27, Departments of the Army and the Air Force, para. 2-2b; fig. 2-2
- Builder Basic, NAVEDTRA 14043A, Naval Education and Training Command, U.S. Navy, ch. 3, fig. 3-10
- Reading Architects' Blueprints, William S. Lowndes, 1922, International Textbook Company, Scranton (Internet Archive), §5, arts. 48–49
Last reviewed September 24, 2026 by Rory Hansen. How we research