Instructor’s Guide to Accompany Carpentry, Third Canadian Edition
Copyright © 2017 Nelson Education Ltd. Unit 8
8.Section views showing the elevation of interior walls are often
drawn at ½″ = 1′-0″ or ¾″ = 1′-0.″
9.Often with CAD drawings, the designer scales to “fit the page”;
this means you can get almost any scale. On the one hand, you
have a larger drawing to interpret, but it’s an odd scale to
reference.
Slides 20-27 to
20-29
O. Types of Lines
1.Some lines in an architectural drawing look darker than others.
2.They are broader so that they stand out clearly from other lines.
3.This variation in width is called line contrast.
4.This technique, like all architectural drafting standards, is used
to make the drawing easier to read and understand.
5.Object lines outline the object being viewed, and are broad,
solid lines.
6.These lines represent the portion of the building visible in this
view.
7.Hidden lines indicate an important object not in view.
8.A hidden line consists of short, fine, uniform dashes.
9.Hidden lines are used only when necessary, otherwise the
drawing becomes confusing to read.
10.Centrelines are indicated by a fine, long dash, then a short dash,
then a long dash, and so on.
11.They show the centres of doors, windows, partitions, and
similar parts of the construction.
12.A section reference or cutting-plane line is, sometimes, a broad
line consisting of a long dash followed by two short dashes,
with arrows at its ends.
13.The arrows show the direction in which the cross-section is
viewed.
14.Letters identify the cross-sectional view of that specific part of
the building.
15.More elaborate methods of labelling section reference lines are
used in larger, more complicated sets of plans.
16.The sectional drawings may be on the same page as the
reference line or on other pages.
17.A break line is used in a drawing to terminate part of an object
that actually continues.
18.It can be used only when there is no change in the drawing at
the break.
19.Its purpose is to shorten the drawing to utilize space.
20.A dimension line is a fine, solid line used to indicate the
location, length, width, or thickness of an object.
21.It is terminated with arrowheads, dots, or slashes.
22.Extension lines are fine, solid lines projecting from an object to
show the extent of a dimension.