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Recommended Designations for Architecture, Engineering, and Facility Management Computer-Aided Design
Italicized text herein is not included in the original and is in explanation of optional modifications to the CLG provided for in CLG Doctor®, a CLG Management Dialog for AutoCAD. © 1996-2005 ParaCADD The following is a brief excerpt of the above 55 page first edition published by: The American Instuitute of Architects Press 1735 New York Avenue NW Washington, DC 20006-5292 © 1990 The American Institute of Architects All rights reserved.
The Task Force on CAD Layer Guidelines
Prepared by:The Task Force on CAD Layer Guidelines Sponsored by: The American Institute of Architects The American Consulting Engineers Council The American Society of Civil Engineers The International Facility Management Association The Naval Facilities Engineering Command The United States Army Corps of Engineers, and The Department of Veterans Affairs. Members of The Task Force on CAD Layer Guidelines: Representing the American Institute of Architects, Practice Committee: Michael Scheley, AIA, task force chairman, FM:Systems, Raleigh, North Carolina Richard Buday, AIA, Buday Wells Architects, Houston, Texas Mark Lauden Crosley, AIA, San Francisco, California William Garbus, AIA, IBM Corporate Real Estate Construction Staff, Stamford, Connecticut Terrence G. Schilling, AIA, Irvine, California Representing the American Consulting Engineers Council: Timothy O'Conner, PE, Automation Integrators, Birmingham, Michigan Hal Parks, PE, Cater and Parks, Birmingham, Alabama Alan G. Steinle, PE, Duffield Associates, Wilmington, Delaware Representing the International Facility Management Association: Thomas Kvan, Strategic Management Consulting, Alexandria, Virginia Representing the American Society of Civil Engineers: Charles Moone, M.ASCE, Willdan Associates, Anaheim, California Representing the Naval Facilities Engineering Command: Dana K. Smith, AIA Representing the United States Army Corps of Engineers: Edward Middleton, Ph.D. Representing the Department of Veterans Affairs: Randy Holt With Assistance of the staff of the American Institute of Architects: Charlotte Franklin, senior director, Practice Christopher R. Clark, AIA, director, Practice Elizabeth M. White, assistant director, Practice CAD Layer Guidelines are published by: The American Institute of Architects Press Washington, D.C. The Layer Guidelines are organized
as a hierarchy. This structure makes the list Note: Long format layer names can be automatically converted to short format layer Long Format Major Group-1 character. This categorization breaks the list into manageable sections, using the divisions of architectural, structural, mechanical, plumbing, fire protection, electrical, civil engineering and site work, and landscape architecture. Minor Group-4 characters. Generally minor groups designate assemblies or construction systems such as walls, doors, ceilings, or electrical power. Modifier-4 characters (optional). This is an optional field for further differentiation of minor groups such as distinguishing full height walls from partial height walls or emergency lighting from general lighting. User Defined-1-4 characters (optional). This optional field may be used to accommodate special project requirements. X-XXXX-XXXX-XXXX Examples A-WALL Walls A-DOOR-IDEN Door NumbersModified Long Format A linetype and color specifier are inserted in place of the first two hyphens of the unmodified long format layer name The linetype or color specifier can each be used alone. If either one is not used in the long format then the layer name simply has no modifications there and the hyphen remains. Linetype specifier - 1 character. (Optional, an hyphen if not used). Color specifier - 1 character. (Optional, an hyphen if not used). XCXXXX2XXXX-XXXX Examples: ACWALL2 Walls ACDOOR2IDEN Door NumbersShort Format
Major Group - 1 character
Minor Group - 2 characters
Modifier - 2 characters (optional)
User Defined - 1-2 characters (optional)
XXXXX-XX
Examples: AWA Walls
ADOID Door Numbers
Modified Short FormatA linetype and color specifier are appended to the unmodified short format layer name prior to the user-defined field if one is used. If a modifier is not used then an hyphen is put in its place prior to the linetype and color specifiers When the user-defined field is used it is always preceded by an hyphen. The linetype or color specifier can each be used alone. If linetype is not used with color then an hyphen is put in its place in the layer name. If color is not used it is simply ignored and the layer name is constructed without it. Linetype specifier - 1 character (optional, an hyphen if color is used alone) Color specifier - 1 character (optional) XXXXXC2-XX Example: AWA-C2 Walls ADOIDC2 Door Numbers Major Groups Although the major groups correspond to the traditional discipline designations used in construction document sheet numbering, they are not intended to suggest or control which member of the design team draws which objects. For example, the column grid would be placed on layer S-GRID regardless of whether it was drawn by the architect or structural engineer. Eight major groups are defined in the unmodified guidelines: A Architecture, Interiors, and Facilities Management S Structural M Mechanical P Plumbing F Fire Protection E Electrical C Civil Engineering and Site Work L Landscape Architecture G General, Border Sheets, etc., not specific to a discipline, (a modification to the CLG)Linetype Specifier (modification to the CLG) Linetype specifier is a single character that replaces the hyphen immediately after the major group of the long format layer name. This modification is required if changes of Xref'd entity linetypes will be made in the current drawing. This is a limitation of AutoCAD. Since it is hard to predict such needs in advance it is best to avoid rework by always specifying layer linetype and using "bylayer" for entity linetype. The number of linetypes available is limited to the number of valid characters that can be used. The characters used and their associated linetype is left to the user. Minor Groups Minor groups subdivide major groups on the basis of construction system or type of information. For example, the architectural major group contains minor groups for walls, doors, floors, ceilings, furniture, and equipment. Color Specifier (modification to the CLG) Color specifier is a single character that replaces the hyphen immediately after the minor group of the long format layer name. This modification is required if changes of Xref'd entity colors will be made in the current drawing. This is a limitation of AutoCAD. Since it is hard to predict such needs in advance it is best to avoid rework by always specifying layer color and using "bylayer" for entity color. The number of colors available is limited to the number of valid characters that can be used. The characters used and their associated color is first numeric and then alphabetic. For example: Red=1, Yellow=2, Green=3, etc. through White=7. The colors in AutoCAD are purely numeric from this point on. After color number 9 the color specifier is alphabetic, i.e. 10=A, 11=B, 12=C, 13=D, 14=E, 15=F, etc. The number of colors available is limited to the number of valid characters that can be used. Modifier A modifier may be added to a layer name for further differentiation. For example, walls (A-WALL) may be categorized as full height (A-WALL-FULL), partial height (A-WALL-PRHT), or movable (A-WALL-MOVE). The modifier is optional and need not be used when the minor group layer name alone will suffice. For example, a simple project might be accomplished using only the layers shown below: A-WALL AWA Walls A-DOOR ADO Doors A-GLAZ AGL Windows, Window Walls, Curtain Walls, and Glazed Partitions A-FLOR AFL Floor Information A-CLNG ACL Ceiling Information A-ELEV AEL Interior and Exterior Elevations A-DETL ADE Details A-PFLR APF Floor Plan A-PCLG APC Reflected Ceiling PlanCAD drawings may contain a combination of layer names with and without modifiers. In the example below, A-WALL contains all walls except partial height and movable walls. A-WALL AWA Walls A-WALL-PRHT AWAPR Partial Height Walls A-WALL-MOVE AWAMO Movable Walls A-DOOR ADO Doors A-DOOR-IDEN ADOID Door Numbers A-GLAZ AGL Windows, Window Walls, Curtain Walls, and Glazed PartitionsThe choice of using layer names with or without modifiers allows the guidelines to be used in a straightforward, streamlined fashion for simple projects that don't need the level of detail required for large complicated projects. User Definable Fields The guidelines are intended to be open-ended. The user-defined field allows additional layers to be added to accommodate special project requirements. The user-defined field may be added after a modifier or in place of a modifier. Below are some examples of user-defined fields: A-DOOR-METL ADR-ME Metal Door A-DOOR-IDEN-METL ADRID-ME Metal Door Number A-FURN-PANL-MFR1 AFUPN-M1 Furniture Panels from Mfr 1 A-FURN-PANL-MFR2 AFUPN-M2 Furniture Panels from Mfr 2 A-WALL-01 AWL-01 Walls on 1st Floor A-WALL-02 AWL-02 Walls on 2nd FloorUser-defined fields may be variable in length up to 4 characters for long format layer names or 2 characters for short format layer names. Building and Drawing Information Layers Layer names for each major group are divided into two sections: building information layers and drawing information layers. Building information generally represents the physical form of the site, building, or objects in the building This information is often shared between drawings. Examples include walls, doors, light fixtures, and room numbers. Building information may be either literal (such as walls) or symbolic (such as electrical outlets) . Cross-hatching and identification labels such as room numbers are also grouped with building information, using the modifiers "PATT" and "IDEN" since this information is often shared between drawings. Drawing information adds annotation, dimensions, and cross references and usually is not shared between drawings. Examples include notes, dimensions, annotative symbols, and tabulations. Drawing information layers are organized by drawing type and type of information rather than by construction system. For example: A-PFLR-TTLB APFTT Sheet Title Block and Name A-PFLR-DIMS APFDI Architectural Floor Plan Dimensions A-PCLG-DIMS APCDI Architectural Reflected Ceiling Plan DimensionsLayers for Elevations, Sections, Details, and Three-Dimensional Drawing Special groups of layers within each major group are defined for elevations, sections, and details: *-ELEV *EL Elevations *-ELEV-OTLN *ELOT Building Outlines *-ELEV-PATT *ELPA Textures and Hatch Patterns *-ELEV-IDEN *ELID Component Identification *-SECT *SE Sections *-SECT-MCUT *SEMC Material Cut by Section *-SECT-MBND *SEMB Material beyond Section Cut *-SECT-PATT *SEPA Textures and Hatch Patterns *-SECT-IDEN *SEID Component Identification Numbers *-DETL *DE Details *-DETL-MCUT *DEMC Material Cut by Section *-DETL-MBND *DEMB Material beyond Section Cut *-DETL-PATT *DEPA Textures and Hatch Patterns *-DETL-IDEN *DEID Component Identification NumbersThe modifier "-ELEV" can also be added to any minor group layer (A-WALL, A-DOOR, etc.) to identify information only seen in 3D views. This facilitates integrating three-dimensional CAD "models" with two-dimensional plan drawings. For example: A-WALL AWA Walls (in Plan View) A-WALL-ELEV AWAEL Wall Surfaces (3D Views) clgdoc  paracadd.com
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