Foreword

TCVN 5671:2012 replaces TCVN 5671:1992.

TCVN 5671:2012 was converted from TCVN 5671:1992 in accordance with Clause 1, Article 59 of the Law on Standards and Technical Regulations and Point b, Clause 1, Article 6 of Decree No. 127/2007/ND-CP detailing the implementation of several articles of the Law on Standards and Technical Regulations.

TCVN 5671:2012 was compiled by the Institute of Architecture, Urban and Rural Planning – Ministry of Construction, proposed by the Ministry of Construction, appraised by the Directorate for Standards, Metrology and Quality, and promulgated by the Ministry of Science and Technology.

1. Scope of Application

1.1. This standard stipulates the components, contents, technical requirements and symbols of drawings in the architectural design documentation of buildings and structures.

1.2. This standard does not apply to overall perspective drawings, interior drawings and competition entries.

2. General Regulations

2.1. Architectural drawings are denoted by the letters KT, followed by Arabic numerals indicating the ordinal number of the drawing or a fraction (the numerator indicates the ordinal number, the denominator indicates the total number of drawing sheets).

For example: KT – 04 or KT – 1/18

For the construction drawing design documentation, it is necessary to have additional summary tables of requirements for components, equipment, special decorative materials and finishes.

2.2. The dimensions of the drawing sheet size are uniformly specified as multiples of A4 paper size.

2.3. The drawing format, symbols, names, numbers, page numbers, lines, lettering, construction material symbols, axis numbering and axis symbols shall comply with relevant regulations.

2.4. The position of the dimensioning lines must be placed inside the fence wall lines of the structure (if any) and along the outside of the main wall lines of the building. When the structure has surrounding fence walls, the dimensions of the component walls and the overall dimensions of the building or structure are indicated outside the fence walls.

In addition to the above requirements, the dimensioning conventions must comply with relevant regulations.

2.5. The measurement system applied in architectural design documentation is the metric system.

• Dimensions are indicated in mm.
• Elevations are indicated in m.
• Areas are indicated in m².

In cases where it is mandatory to apply another measurement system, it must be clearly noted in each drawing.

2.6. Architectural design drawings are depicted at the following scales: 1:1, 1:3, 1:5, 1:10, 1:20, 1:50, 1:100, 1:200, 1:500, 1:1000.

NOTES:
1) Schematic drawings (network diagrams, activity flow charts, production process flow diagrams, etc.) and perspective drawings do not use dimensional scales.
2) In a drawing with multiple drawings at different scales, the scale of each drawing must be clearly indicated next to it, except for typical design drawings and drawings not to scale.

2.7. The method of indicating elevations is specified as follows:

• The base elevation of the structure ± 0.000 is the intersection line between the base of the wall and the sidewalk surface at the main entrance of the building.
• Next to or below the ± 0.000 elevation of the structure, it is necessary to indicate the corresponding elevation relative to sea level according to the national unified elevation system, depending on the requirements of each type of drawing.

For example:

• In cases where data on the corresponding elevation relative to sea level according to the national unified elevation system is not available, the ± 0.000 elevation of the structure should be compared with a predetermined point specified by the construction permitting authority.
• The ± 0.000 elevation must be consistent across all drawings of the structure’s design documentation.

2.8. In the floor plan drawing, names and symbols are applied as follows:

• Rooms and spaces in the building and structure should be numbered in order. If the building or structure has multiple floors, the room numbers on the topmost floor are indicated from left to right, the floor below is indicated from right to left, the next floor below is again from left to right, and so on.
• The names of rooms and spaces are indicated at the position of that room or space. In the drawings of the architectural design documentation, the names of rooms and spaces can be symbolized using uppercase letters.

NOTE: The method of marking room numbers and names refers to TCVN 6003-2:2012.

• It is necessary to indicate the symbols and quality of materials used for plastering or cladding the walls surrounding that room or space. The symbols can be indicated and annotated outside the drawing.

2.9. On the floor plan drawing and detailed floor plan drawing of architectural construction, the position of the depicted section must be clearly indicated. At the location of a folded section, it is imperative to depict the position of the section. The section must depict the characteristic features of the building (windows, staircases, etc.). The cutting plane must be depicted using a long dash-dot thick line.

2.10. Design drawings must be clearly depicted to ensure the ability to reproduce multiple copies.

3. Floor Plans

3.1. Existing Conditions Site Plan and Overall Site Plan

3.1.1. The existing conditions site plan and overall site plan are usually depicted at a scale of 1:1,000. In cases where different scales must be used, the depiction must still ensure compliance with all provisions in 3.1.

3.2.1. The existing conditions site plan must depict the following requirements:

• The relationship between the designed building or structure and the surrounding environment;
• North direction arrow symbol;
• At least one determined point elevation in the national unified elevation system must be clearly indicated;
• Average elevation of the existing conditions site.

3.3.1. Around the structure, it is also necessary to depict:

• Buildings or structures, including temporary construction parts on the site;
• System of lines, pipeline system, transportation network (railways, drainage pipes, gas pipes, power lines, etc.);
• It is necessary to clearly and accurately indicate special factors about water, electricity, and elevations of the groundwater table in the drawing;
• Indispensable factors are:
  • Inspection and determination locations of groundwater level;
  • Locations of (large) trees, existing water wells, electric poles;
  • Entrance gates to the building or structure, number of floors;
  • The ± 0.000 elevation of the structure is the corresponding value in the national unified elevation system or the corresponding value of a determined point; the eave elevation of an adjacent structure can be used as a reference;
  • The position and elevation of the corner points of the building or structure, the actual values of those points in the national unified elevation system or relative to a fixed point with a determined elevation.

3.4.1. It is necessary to indicate the main dimensions of the building or structure, the distances between buildings or structures, the distances from the designed building or structure to existing buildings or structures. The distances from the outer face of the structural components to the red line or the boundaries of adjacent transportation systems.

3.5.1. When using undefined symbols to represent in drawings, annotations must be provided. It is allowed to use bold lines and various line styles to shape the structure, but it must not affect the readability of numbers, letters, and symbols in the drawing.

3.6.1. The existing conditions site plan drawing should include a schematic drawing of the overall existing conditions of the construction area, including the location of the structure and the surrounding area conditions (extracted from the zoning plan), at a scale of 1:25,000 to 1:1,000.

3.2. Floor Plans

3.2.1. Floor plans are typically depicted at scales from 1:200 to 1:50.

3.2.2. For multi-story buildings or structures with floor-to-floor differences in layout and structure, all floor plans must be depicted. If the floor plans are identical in layout and structure, only a typical floor plan needs to be depicted.

3.2.3. A floor plan is a horizontal section of the building or structure when using a cutting plane located horizontally at an elevation approximately 1/3 of the story height above the floor level (or at an elevation of 1 m above the floor level) cutting through the building or structure. In cases where windows are designed higher than the conventional elevation mentioned above, the horizontal section is taken at the elevation aligned with the windows.

3.2.4. The floor plan drawing in the architectural design should depict:

• Floor plan layout with main dimensions of rooms;
• Walls, partitions, columns;
• Doors (with door swing direction), windows, wall openings, staircases, etc.;
• Room areas calculated in m², indicated in a corner of the room and underlined;
• Dimensions between wall sections, wall axes, and overall length (or width) of the building or structure around the perimeter of the floor plan;
• Story height (if necessary) relative to the ± 0.000 elevation of the structure.

3.2.5. Load-bearing walls, in the floor plan drawing of the architectural design, are depicted:

• Fully blackened or cross-hatched;
• If not depicted using the above methods, the section of the wall cut through is drawn with a thick solid line, the section farther from the cutting plane is drawn with a thin solid line.
• Floor finishes should only be depicted in cases of special material usage, but it should not affect the depiction and clarity of the floor plan drawing.

3.2.6. In addition to the requirements specified in 3.2.4 and 3.2.5, the floor plan drawing in the technical design documentation should further depict:

• Openings in ceilings and floors;
• Chimneys, fireplaces, ventilation ducts, supply and drainage pipes with complete dimensions;
• Types of fixed equipment arranged in the building (bathtubs, toilets, sinks, built-in cabinets, stove bases, etc.).

3.2.7. The floor plan drawing of the structure in the technical design documentation should fully indicate:

• Inside the drawing: Two-dimensional dimensions of room components, names, numbers, usable areas (in necessary cases, also indicate floor finish material symbols), interior width and height dimensions of windows, floor elevations of stories relative to the ± 0.000 elevation of the structure;
• Outside the drawing: Dimensions of wall sections, openings, distances between door axes, window axes, distances between column grid axes in frame structures;
• Overall dimensions of the entire structure and main components;
• Basement floor plans should clearly indicate elevations relative to below the ± 0.000 elevation of the structure, with the corresponding value of the national unified elevation system or the corresponding elevation of a certain fixed point indicated below.

3.2.8. The floor plan drawing in the construction drawing design documentation should additionally depict:

• Main framing and construction of doors;
• Key dimensions related to the installation of fixed equipment;
• Wall cladding materials, base materials, waterproofing materials, and all necessary structures to be depicted in accordance with the scale requirements of the drawing.

3.2.9. On the floor plan drawing in the construction drawing design documentation, it is necessary to fully indicate:

• Numbers, internal width and height dimensions of doors;
• Internal distances between door axes and the nearest parallel wall;
• Elevations, connection locations, dimensions of openings, ventilation ducts, exhaust ducts, and dimensions necessary for determining the construction position;
• Staircase width, staircase axis, overall staircase dimensions, number of steps in ascending order;
• Quality of bricks and mortar for walls;
• Base cladding materials and floor finishes (can be indicated along with names and areas of each component or wall);
• Elevation of the floor level relative to the ± 0.000 elevation of the building;
• Settlement joints, chimney cleaning doors (if any);
• Air conditioning systems, heating, decorations, sanitary equipment in the building.

3.2.10. In the flat roof plan drawing, depict:

• Settlement joints of the structure (if any);
• Locations of chimneys, ventilation ducts, rainwater drainage holes, and roof components;
• Positioning dimensions of those components relative to each other or to a fixed point;
• Drainage direction, height of drainage gutters, water dividing lines.

3.2.11. On the sloped roof plan drawing, it is necessary to depict:

• All horizontal structural components;
• Roof ridge and positions of main trusses;
• Trusses depicted with dashed lines;
• Positions of columns, piers, chimneys, rainwater gutters, ventilation ducts, guardrail walls, etc., and structures related to the attic floor work (attic or space between ceiling and roof);
• Columns, piers, load-bearing walls below the attic floor depicted with dashed lines;
• Positions of light openings, windows, and small parts on the sloped roof.

3.2.12. Prefabricated components (floor panels, wall panels, etc.) should be depicted according to the requirements of separate technical documentation. On the construction drawing, unified symbols must be used for all components throughout the entire design documentation. It is imperative to fully indicate the dimensions necessary for the installation of components.

3.2.13. On the construction drawing design of the floor plan, there should be:

• List of windows, doors, gates, door leaves;
• List of metal parts required for installation;
• List of equipment.

3.2.14. On the construction drawing design of the floor plan, it is necessary to depict:

• Coordinate axes of the building or structure (external axes, at settlement joints, at boundaries of different floor types);
• Distances between outermost axes;
• Walls, partitions of the building;
• Entrance gates;
• Railways, technological tracks;
• Boundaries between areas with different floor structures;
• Floor types in the rooms of the structure;
• Dimensions of connections: Pipelines, drainage channels, water inlets concealed by floor structures;
• Intersection of crane runway axes with the coordinate axes of the building or structure. In necessary cases, the crane’s working area must be depicted;
• Marking of areas or locations prone to explosion or fire;
• Separate details of floor connections with building structures, details of floor components where they connect with floors of different structures (difficult areas, etc.).

3.2.15. The component installation diagram in the construction drawing design documentation should depict:

• Positions of components with full symbols and installation dimensions;
• Crane runways and their working ranges.

4. Sections

4.1. Sections in the architectural design documentation are depicted at a scale of 1:100 and must clearly indicate:

• Elevations of components, indicated according to the vertical direction of the designed structure;
• Elevations of floors and roofs relative to the ± 0.000 elevation of the structure. On the section, it is not necessary to indicate symbols for the structure of the building.

4.2. Sections in the technical design documentation are depicted at a scale of 1:100 or 1:50 and must depict:

• Interior spaces of the structure, the most characteristic areas;
• Heights and structures of building components.

4.2.1. Inside the section drawing, it is necessary to fully indicate:

• Internal height dimensions and structural elevations of rooms;
• Elevations and thicknesses of window sills;
• Heights of half-walls;
• Elevations of floors relative to the ± 0.000 elevation of the structure;
• Names of floors.

4.2.2. Outside the section drawing, it is necessary to fully indicate:

• Door heights;
• Dimensions of main components and overall dimensions of the structure;
• Elevations of chimneys, roof ridge, eaves relative to the ± 0.000 elevation of the structure;
• Determined groundwater level elevation;
• Original ground and backfill;
• ± 0.000 elevation of the structure relative to the actual elevation according to the national unified elevation system, or relative to the elevation of a certain fixed point;
• Paving materials surrounding the structure, waterproofing materials, and floor slab construction.

4.3. Sections in the construction drawing design documentation are prepared at a scale of 1:100 or 1:50 and must additionally depict, beyond the requirements of the technical documentation:

• Specified symbols for materials of structural components being cut through;
• Staircase construction including:
  • Height and length dimensions of stair flights;
  • Step dimensions;
  • Flooring materials.
• Heights of railings, handrails;
• Dimensions and materials of railings, handrails;
• Depth dimensions of the structure’s foundation;
• Overall width dimension of the roof.

4.3.1. Inside the drawing, it is necessary to additionally indicate, beyond the requirements for the section drawing:

• Height dimensions of doors, beams, railings, window sills relative to the floor or ceiling;
• Internal structural height dimensions of components within load-bearing walls;
• Elevations of floor and ceiling of the story;
• Composition layers of floors and roofs.

4.3.2. Outside the drawing, it is necessary to additionally indicate the requirements for the section drawing:

• External elevations of doors, railings, eaves relative to the ± 0.000 elevation of the structure;
• Heights of components and the entire structure;
• Characteristic transverse dimensions of the entire structure.

4.3.3. In the case of sloped roofs, it is necessary to depict:

• All characteristic sections of the roof structure;
• All structural dimensions of the sectioned components;
• Dimensions, positions, elevations, and distances between components.

5. Elevations

5.1. Elevations in the architectural design are depicted at a scale of 1:200.

5.1.1. In the design documentation, it is necessary to depict:

• Main elevations of the structure;
• Characteristic elevations of the structure.

5.1.2. In the elevation drawing, it is necessary to depict:

• ± 0.000 elevation of the structure, elevations of the roof ridge and eaves;
• Doors and windows need to have accurately spaced divisions, but details are not necessary;
• Chimneys, ventilation ducts, or construction components on the roof visible in the elevation;
• A part or the entire adjacent structure, if any.

5.1.3. In cases where the above-mentioned design documentation is depicted at larger scales, the provisions in 5.1 still apply.

5.2. Elevations in the technical design are depicted at a scale of 1:100 or 1:50.

5.2.1. In the technical design documentation, it is necessary to depict all elevations of the structure.

5.2.2. In the elevation drawing, it is necessary to depict:

• External components that affect and relate to the architectural concept, wall area of the structure (dimensions dividing doors, windows, artistic shaping forms, rainwater pipes, fireproof walls, chimneys, etc.);
• A part of the elevation of the adjacent structure (if any). In cases where the adjacent structure is a historical monument or memorial, it must be fully depicted (images can be used);
• Elevations of floors, roof ridge, eaves, chimneys relative to the ± 0.000 elevation of the structure.

5.3. Elevations in the construction drawing design are depicted at a scale of 1:100 or 1:50.

5.3.1. The elevation design documentation for construction drawings includes all elevations of the structure. In cases where elevations are obscured, they are depicted in combination with sections.

5.3.2. In the elevation drawing, it is necessary to depict:

• Details and components that affect the exterior of the structure’s elevation (wall sections, window grid dimensions, artistic shaping forms, rainwater pipes, railings, window sills, chimneys, etc.);
• A part of the elevation of the adjacent structure; in cases where the adjacent structure is a historical monument or memorial, it must be fully depicted (images can be used);
• Elevations of chimneys, roof ridge, eaves relative to the ± 0.000 elevation of the structure;
• Annotations of shaping materials, decorations on wall sections (if any).

6. Architectural Construction Details

6.1. The content of the detail drawing should depict:

• The most characteristic construction details of structural components;
• Materials used, detail dimensions, detail numbers;
• If details in a drawing are depicted at different scales, the scale used must be indicated next to the drawing.

6.2. In detail drawings at scales of 1:5, 1:2, depending on the line density, the names of the compositional layers of the detail can be indicated on the sectioned parts or outside the drawing.

6.3. In detail drawings at a scale of 1:1, it is necessary to depict the materials used, dimension lines, and dimension values.

6.4. Detail drawings used for pre-production are usually depicted at scales from 1:20 to 1:1. The following scales can be referenced:

• Door frames, base cladding details, scales 1:5, 1:2, 1:1;
• Eaves frames, door frames, base cladding materials, scales 1:20, 1:10, 1:5, 1:2, 1:1;
• Chimney equipment, scale 1:10;
• Extended chimney components, scales 1:50, 1:20;
• Staircases, scales 1:20, 1:10, or 1:1;
• Railings, handrails, scales 1:20 or 1:2;
• Thin metal construction components, scales 1:5, 1:2, or 1:1;
• Flat roof constructions, scales 1:5, 1:2, or 1:1;
• Settlement joint constructions, scales 1:2 or 1:1;
• Constructions of flat wooden roof structures, sluice gates, windows, scales 1:20, 1:10, 1:5;
• Detail drawings of ornamental stones, wash basins, scales 1:10, 1:10, 1:5, 1:2, 1:1;
• Fences, scales 1:20, 1:5;
• Door elevations, scales 1:20, 1:10;
• Details, scales 1:5, 1:2, 1:1.

REFERENCE DOCUMENT DIRECTORY

TCVN 6003-2:2012, Construction Drawings – Symbol System – Part 2: Room Names and Numbers.