Use of Line Styles and Line Weights
The scale of a drawing and the density of the detail often governs the use of line weights and line styles. The consultant should apply standard industry drafting practices for each drafting discipline, in determining which line styles and weights to use.
This chart provides a guideline for selecting line weights and line styles. The most commonly used items are listed on this chart. The line weights and styles shown on the chart should be followed where possible.
|
DESCRIPTION |
WEIGHT |
STYLE |
|
index contours |
3 |
0 |
|
intermediate contours |
1 |
0 |
|
top of cut, toe of fill |
2 |
3 |
|
ditch flow lines |
0 |
7B |
|
tree or shrub lines (usually patterned) |
0 |
0 |
|
paved roads |
1 |
0 |
|
dirt or gravel roads |
1 |
2 |
|
fence lines (usually patterned) |
0 |
0 |
|
underground site utilities, piping, conduit |
2 (3 or 4) |
0 |
|
building outlines |
1 |
0 |
|
hidden building outlines |
1 |
2 |
|
footing lines (hidden in plan view) |
1 |
3 |
|
handrails |
1 |
6 |
|
concrete outline in section |
1 |
0 |
|
steel members, double line |
1 |
0 |
|
steel members, single line |
3 |
0 |
|
reinforcing bars |
3 |
0 |
|
conduit, exposed |
3 |
0 |
|
conduit, hidden |
3 |
2 |
|
wiring and cabling |
2 |
3 |
|
ground wiring |
2 |
4 |
|
piping, double line |
1 (or 2) |
0 |
|
piping, single line |
3 (or 4) |
0 |
|
duct work, outlines |
1 |
0 |
|
revision "bubble" (use a curve string) |
4 |
0 |
|
dimension lines, leaders, and arrows |
0 |
0 |
|
center lines |
0 |
7A (or 4) |
|
match lines |
4 |
7B |
|
SCHEMATIC DRAWINGS |
WEIGHT |
STYLE |
|
wiring on electrical schematics |
2 |
0 |
|
equipment outlines on schematics |
1 |
6 |
|
shield and shield wires on electrical schematics |
1 |
5 |
|
major piping on P&ID's |
5 |
0 |
|
secondary piping on P&ID's |
2 |
0 |
|
signal lines on P&ID's |
2 |
2 |