7.6 LETTERING: Use uppercase lettering. Vertical lettering is preferred.
Lettering must be plain, free of adornment and legible. The minimum size
lettering on project drawings shall be free-hand 5/32 (0.156) inch high and
mechanical or computer graphics 1/8 (.125) inch high. Since the drawings
are microfilmed and reproduced half-size for bidding purposes, lettering
less than the dimensions listed above is difficult to read after reduction.
The use of pencil or crayon shading or poche on the back of drawings will
not reproduce satisfactorily after microfilming. Sections or areas
normally denoted by poches shall be indicated by stippling, crosshatching,
or other pattern indication. Markings shall be on the front of drawings.
7.7.1 Uniformity: Scales used shall be large enough to show clearly all
details when reduced to half-size. For civil work contact the PDE for
review of the scales proposed to be used. A common problem has been that
scales too small to show existing and new work are frequently used. Scales
shall be uniform on drawings for a particular project and for a particular
type of work. If necessary to maintain proper scale, divide plans of large
buildings or structures into two or more sheets, with appropriate key plan
and match lines.
7.7.2 Graphic Scales: See Appendix S, Figures 1, 2 and 3, for
architectural, engineering and metric types of graphic scales; the scales
shown in these figures are not to scale. Provide drawings with graphic
scales located immediately to the left of the title block, with the words
"Graphic Scales" directly over the scales.
a. Floor plans and elevations: 1/4 or 1/8 (1/16 inch only on
approval by PACNAVFACENGCOM) inch = 1 foot, except that mechanical drawings
showing air conditioning ductwork and areas receiving extensive piping work
shall be drawn at a scale not less than 1/4 inch per foot. Mechanical
drawings of the general floor plans may be prepared at 1/8 inch scale with
detailed areas at 1/4 inch per foot.
3/4, 1 1/2, or 3 inches = 1 foot.
Molding sections and similar details:
full size or half size.
Mechanical and electrical details:
1/2, 3/4, or 1 inch = 1 foot.
e. Structural details:
1/2, 3/4, or 1 inch = 1 foot (larger, if
SI (Metric) System:
Metric Design Scale (Preferred):
Scale Scale Equivalent
300 mm = 300 mm
Full size 12"=1'-0"
60 mm = 300 mm
Close to 3" = 1'-0"
30 mm = 300 mm
Close to 1 1/2"= 1'-0"
15 mm = 300 mm
Close to 5/8" = 1'-0"
12 mm = 300 mm
Close to 1/2" = 1'-0"
6 mm = 300 mm
Close to 1/4" = 1'-0"
3 mm = 300 mm
Close to 1/8" = 1'-0"