Compiled by Allan. January 2005
Sheet Numbering Concept
The core concept of this system is to break the drawing sheets into more manageable chunks by isolating building elements into groups.
The Divisions
| Division | Description | Remarks |
| S1 | Structural Coversheets | General Notes, Drawing Schedule |
| S2 | Plans | All types of plans: slab, roof framing, reinforcing, stressing plans etc. also include member schedules on plan |
| S3 | Building Elevations | Overall elevations, Concrete/Masonry Elevations, Precast Elevations |
| S4 | Building Sections | Overall building sections showing several elements |
| S5 | Foundation Details | All details to do with foundations |
| S6 | Retaining Wall Details | Retaining walls of any type of material |
| S7 | Slab Details | “Slab on grade” details, floor slab details / sections |
| S8 | Concrete Column Schedules | Schedules, Elevations, Detailed Sections of concrete columns |
| S9 | Concrete Beam Schedules | Schedules, Elevations, Detailed Sections of concrete beams |
| S10 | Lifts, Stairs, Vertical Circulation | Elevations, Schedules , Details of any element rising through floor levels |
| S11 | Steel Details | |
| S12 | Masonry Details | |
| S13 | Precast Details | |
| S14 | Timber Details | |
| S15 | External Works |
Double Decimals
Where multiple plans of the same level are required a double decimal system may be used. Example:
| S2.1 | Level 1 Slab Plan |
| S2.1.1 | Level 1 Reinforcement Layout |
| S2.1.2 | Level 1 Prestress Layout |
| S2.2 | Level 2 Slab Plan |
| S2.2.1 | Level 2 Reinforcement Layout |
Example Set:
| S1.1 | General Notes |
| S2.1 | Level 1 floor plan |
| S2.1.1 | Level 1 bottom reo plan |
| S2.2 | Level 2 floor plan |
| S2.3 | Roof plan |
| S5.1 | Foundation details |
| S7.1 | Slab Details |
| S11.1 | Steel Details |
Notes
- Small Projects: Plans and details can occupy the same sheet on smaller jobs. In this case use the lowest applicable division for the sheet number.
Eg S2.1 = Level 1 slab plan and details - Client Document Numbers: Some times clients what there own document numbers on the drawings. A recommendation for these projects to show their number in one box titled “document number” and our number in a separate box next door titled “sheet number”.
- A decimal separator is used because it commonly means a “division of a whole”.
Benefits from a Drafting point of view
- Cross referencing errors are reduced due to the relative ease of adding new sheets.
- Changes in design are easier to handle due to easier insertion of additional sheets
- Drawing sets are more logical as they follow a set menu.
Benefits from a Directors point of view
- Cross referencing has always been a major issue when drawing numbers change. This occurs more frequently then it should. Often the problem stems from not allowing enough sheets for expansion of the documentation set, especially when plans have been sequential numbered. With the decimal sheet numbering system, this event is reduced to next to zero. That means less rework of drawings and ultimately a big cost saving for the company.