Standards

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Numbered CAD Layering System

April 2005

Written with the use of AutoCAD in mind, however principles apply to other CAD packages.

Core concepts

All layer names are prefix with a predefined set of numbers is the core of the concept behind this system. The first digit represents the discipline and the following digits refer to the object type (doors, columns etc.).

Benefits

Multiple drafters can work together on the same projects because the layer list is ordered and structured.

In theory elements from different disciplines can be drawn in a single file - In practice XREF-ing to individual files may be easier to manage.

The preset numbering of the layers allows for CAD programs to filter and manipulate the drawing easier. A program can search for those set parameters.

Execution

The layer naming can be just the numbers or with the following extensions:

X = eXisting: the objects drawn are existing conditions

D = Demolition: the objects drawn have to be demolished

N = Non-structural: both Architectural and Structural may require the use of this, for example, defining the structural and non-structural walls.

P = Proposed: Generally drawings are for proposed works anyway, however there may occur cases where it may be necessary to make the distinction.

-description = the dash and description can be used on all layers; example 105-room names, 105X-room names.

Combinded Disciplines - sample list

Layer No.	Description	Layer No.	Description
000	Hatch boundary	410	Hardware
001	All general linework	420	Paving
021	Title sheet	439	Access Floors
030	Dimensions	440	Base layer for Xrefs
032	Room names	444	Partitions
033	Room numbers	450	Roofing
034	Floor finishes	459	Suspended ceilings
035	Detail reference no.	460	Curtain walls
036	Section reference no.	461	Windows
037	General Arch Text	465	Doors
038	General Struct Text	510	Cladding
039	Amendments/Revisions	552	Tiling
040	Grids	553	Resilient Finishes
050	Levels	560	Plastering
051	Contours	570	Painting
060	Symbols	580	Graphics, Artwork
062	Hatch Patterns	591	Carpets
072	Site Features (kerbs, manholes etc.)	610	Loose Furniture
140	Vegetation (Trees etc.	611	Furniture
210	Groundworks	615	Furniture Text
215	Piling	722	Stormwater
220	Concrete	730	Sanitary Services
230	Masonry Walls	737	Plumbing Fixtures
235	Stonework	740	Water Services
250	Structural Steel	783	Fire Protection-Sprinklers
260	Metalwork	884	Fans (ceiling and exhaust etc.)
270	Woodwork	922	Roadworks
280	Glazing	700	Hydraulics
709	General Hydraulic Text	725	Toxic Wastes
720	Drainage	727	Sewer Treatment
728	Special Services	740	Water Services
741	External services - mains	742	Cold Water Supply
743	Hot Water Supply	745	Chilled Water
747	Irrigation	880	Air Handling Ductwork
749	Condensaed Water System	887	Exhaust Systems
780	Fire Protection	828	Lights
787	Fire and Smoke Detection	892	Lifts
791	Voice and Data	892	Lifts
800	General Electrical	846	Security Systems

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