Print scale drives everything
The most common mistake in drawing output is treating line weight as something you set by how the geometry looks on screen. It is not. A line weight is a physical thickness of ink on a sheet, so the only context that matters is the scale at which that sheet will print. A wall section read at one inch to the foot can carry bold, confident lines; the same content squeezed onto a small-scale key plan needs far finer weights or it turns into a smear of black.
At Cadeonn, we decide line weights backward from the final sheet. We ask what scale a detail lands at, then assign weights that will read crisply at that size. Get this relationship right and a drawing breathes; get it wrong and even perfect geometry becomes unreadable.
CTB versus STB plot styles
How those weights actually reach paper depends on the plot style table. A CTB (colour-dependent) table maps printed appearance to each object's screen colour — red plots at one weight, blue at another. It is a legacy of decades when colour was the standard, and it is still everywhere. An STB (named) table instead assigns explicit named styles to objects regardless of colour, which is cleaner and more self-documenting but requires a more disciplined setup.
A drawing's hierarchy is its voice — line weight is how the most important things on the sheet ask to be read first.
Neither is wrong, but a studio should commit to one and apply it consistently. The mechanics of both are well documented by Autodesk, whose tools popularised the colour-to-weight workflow most offices still use. We bake the chosen approach into our studio template so it is never reinvented per project.
Hierarchy and legibility
Line weight is not decoration; it is information architecture. The heaviest lines mark what is cut — walls in plan, the profile of a section. Medium lines describe objects in view. The finest lines carry dimensions, hatching, and reference grids. When that hierarchy is consistent, a reader's eye lands on the right thing first and navigates the sheet without conscious effort. International standards bodies such as ISO publish line conventions precisely because this legibility is too important to leave to taste.
Putting it into practice
- Pick a small palette of weights — typically three to five — and resist adding more.
- Tie each weight to a meaning: cut, object, reference, dimension, hidden.
- Standardise the plot style table across the studio, not per drafter.
- Always proof a real plot at sheet scale before issuing — screens lie about weight.
- Document the system so freelancers and consultants match it instantly.
For the wider production picture, see our guides to dimensioning and the full Insights library, plus downloadable templates in our resources.
Frequently asked questions
What is the difference between CTB and STB plot styles?
A CTB plot style table maps printed appearance to each object's colour, while an STB table assigns named styles directly to objects independent of colour. STB is more explicit, but CTB remains common because of decades of colour-based standards.
How does print scale affect line weight?
Line weight is a printed thickness, so the same drawing plotted at a smaller scale needs proportionally finer weights to stay legible. You set weights for the final sheet scale, not for how the geometry looks on screen.
Want sheets that read beautifully at every scale? Request a free quote or explore more in our Insights library.
Cadeonn handles production drafting for architecture firms — dimensioning, layer standards, and constructible details in DWG or PDF on your timeline. Outsource peak CD work while keeping quality control: get a scoped quote or start with our satisfaction-guaranteed pilot.