For planning permission / permitting…
From an elevation it’s clear that a proposed single storey extension roof has an overhang.
On the floor plan is it necessary / good practice that the overhang should be shown (as a dashed line)?
It depends on your local regulations. If you don’t need to submit a roof plan then I think showing the overhang in your plan is a good idea.
You can isolate the roof in a separate scene using a wireframe style and superimpose it on your plan view in LayOut. I use a bottom-up view to show my ceiling areas in a similar way.
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Thanks Annsi.
There is also a roof plan in the form of a site plan.
The neighbour is a retired architect!
That’s a smart solution, but in some cases, the view from bottom brings more complex edges than a simple overhang boundary.
Beware of those! (I am one, half-retired)
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I like to add the building (wall) outline as a hidden line on the roof plan.
Some times it helps to see the roof outline on the floor plan, but depending on the complexity of the roof it can be too complex or misleading in its representation.
I add these lines in LO as a Scale Drawing traced as necessary to keep the illustration simple. As long as you have an obvious visual placement reference it should be no more of a problem than overlays.