Old School Drafting Conventions
"Style Book - Drafting"
For our IntraNet, we have developed several standards that everyone can refer to when needed. We call this our Style Book. Modern software like ArchiCad takes care of a lot of these issues for you.
If you are still old-school about drafting tools, meaning AutoCAD and the like, standardize your drafting conventions for the last time. Here are our conventions. Modify to suit your taste.
DRAFTING CONVENTIONS - LINE TYPES
LEVEL LINES – FLOORS, TOP OF MASONRY, TOP OF CONCRETE, ETC. Show these lines as a light centerline type with a `target' at the end. Place these lines to the left of drawings and details unless clarity is served by placing them to the right. The line usually starts near but not touching the referenced item. Extend all lines
away from the referenced item so that the `targets' line up. A `Target' is a circle with cross hairs through its center. The perimeter of the circle is a light line about 3/16" in diameter with the upper left and lower right quadrants filled solid.
FINISHED GRADE - Show the Finished Grade as a solid 2.5mm (3/32") thick polyline that represents the desired grade at the face of the wall or other item of construction. Extend the Finished Grade polyline about
8' beyond and in the same plane as the wall, except where other construction intrudes.
EXISTING GRADE - Show the Existing Grade as a dashed medium thick line that represents the existing grade at the face of the wall or other item of construction. Extend the Existing Grade line about 8' beyond
and in the same plane as the wall, except where other construction intrudes.
OTHER LINE TYPES - OVERHEAD LINES - Show lines that occur overhead or behind (not beyond) the picture plane as a dashed line with longer line segments - 1/4" to 3/8" each with 1/16" spacing. Pick a CAD line
type that delivers these results. HIDDEN LINES - Show lines which occur below or beyond (not behind) the picture plane as a dashed line with shorter line segments - 3/32" to 3/16" each with 3/32" spacing. Pick a
CAD line type that delivers these results. PHANTOM OBJECTS - Show the lines of objects that are missing as a dotted line with dots or extremely short dashes space closely together. Pick a CAD line type that delivers these results. Alternatively use a "GHOST" line weight.
DRAFTING CONVENTIONS - LINE WEIGHTS
LINE WEIGHTS - Line weights convey information and make a drawing easier to understand. The line weights that we use are as follows - name/color/lineweight/screening/color name:
HEAVY / 7 / 0.70 / 100 / WHITE (BLACK)
MEDIUM / 6 / 0.50 / 100 / MAGENTA
LIGHT / 2 / 0.35 / 100 / YELLOW (GREEN & CYAN, TOO)
VERY LIGHT / 9 / 0.25 / 100 / LIGHT GRAY
VERY VERY LIGHT / 5 / 0.15 / 100 / BLUE
GHOST / 8 / 0.25 / 20 / DARK GRAY
LINE WEIGHT USE - PLANS: HEAVY for exterior face of exterior walls; MEDIUM for interior face of exterior walls and for both faces of interior walls; LIGHT for doors, windows, overhead changes of plane (long dash), below floor construction (short dash) and notes; VERY (LIGHT for stair construction, plumbing fixtures, casework; and VERY VERY LIGHT for showing internal material changes like veneers or poche' of wall materials or designations for wall types.
LINE WEIGHT USE - ELEVATIONS: HEAVY for outline of building and any major offsets in plane; MEDIUM for minor offsets in plane (overhang, freestanding columns, etc.); LIGHT for doors, windows, gutters, downspouts, other changes in plane, etc.; VERY LIGHT for mullions, change of materials in the same plane; and VERY VERY LIGHT for showing poche' of wall materials, jointing patterns, texture, etc.
All text except titles should be the same size, font/style and case. Our standards are: 3/32" high, Roman S, and ALL CAPS. Use Light line weight for notes (cyan, yellow, green or red) Generally place notes to the right of what they refer to so that the leader is at the beginning of the note. Notes are preferable to key notes; however, use a keynote if space is not available to place the note without overlapping any other lines. Overlapping lines are NEVER desirable and rarely acceptable.
The font/style name for titles is `Bold'.
Apply the appropriate material designations at the latest possible moment to avoid having to change the poche' as new information is added to the drawing.
FLOOR PLANS - None for Schematic Design. Apply at the end of Design Development. Remove 80% of poche' at the start of Construction Documents, leaving poche' at corners and wall intersections for clarity.
REFLECTED CEILING PLANS - NA for Schematic Design. Apply at the end of Design Development (if any). Update at the end of Construction Documents.
ELEVATIONS - None for Schematic Design. Apply at the end of Design Development. Remove 60% of poche' at the start of Construction Documents, leaving poche' at corners and wall intersections for clarity.
CROSS SECTIONS - None for Schematic Design. Apply at the end of Design Development. Remove any 'in the way' during Construction Documents.
DETAILS - NA for Schematic Design. NA for Design Development. Apply all poche' at the end of Construction Documents, poche' only after all lines, dimensions and notes have been completed.
10/21/2013 03:26:31 pm
This article is quit interesting. But I need to know more about this old school drafting conventions. Can you please explain me little more?
10/22/2013 06:10:25 am
By Old School Drafting Conventions I am referring to drafting conventions that preceded CAD. So these conventions attempt to bring those tried and true hand drafting techniques into CAD.
10/22/2013 06:11:15 am
Chit Fund, thank you.
10/27/2014 10:40:23 pm
I love that you care and posted these. I would like to see graphic versiona though.
10/27/2014 11:30:35 pm
That's what's missing! I will see what I can come up with.
Randolph M. Fritz
3/8/2015 05:03:19 am
4/27/2015 03:02:11 am
Glad to hear you use ArchiCAD. I'd be interested to know how it has effected your drawing conventions and productivity.
4/27/2015 04:02:54 am
Sorry to mislead you, Matt.
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