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Modeling and drafting in Archicad. (Example: How can I model a Roof soffit/fascia?)

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User avatar
By Bruce
With the standard suite of GS doors, I'm trying to figure out the difference between Tolerance and Opening Oversize - and why I should use one over the other. I'm not even sure why both options are there.

Tolerance (on Nominal Sizes and Tolerance page) will show a margin around the frame in plan, but in 3D & section/elevation will make the frame wider (Frame width + tolerance). This will also be the case in door schedules.


Opening Oversize will just add this margin to the outside of the door frame - keeping the frame widths in plan, elevation, and schedules. The downside is that you can then see through this gap in 3D/elevation views.


Why would I use one over the other?
User avatar
By Lingwisyer
I use the opening oversize to place exposed beams across the top of doors / windows and columns between them.
User avatar
By Bruce
When placing doors in concrete walls (precast, insitu), you need to provide an oversize for tolerance. This allows you to elevate and dimension the openings off the model.

I have previously used Opening Oversize to achieve this - but have noticed someone has used Tolerance on the project I've been put on to do the same. I'm trying to figure out what Tolerance is good for.
Hi All,

Thank you for raising the question!

Without asking the designer about the difference between these 2 variables, I would like to share my thought on this matter, based on my experience and from the Help Center article:

- Tolerance: every prefabricated element has a tolerance value. During the prefabrication, due to material variation, the final product can be slightly smaller than what it is intended to be. This will be reflected in this field. Below is the comparison when adding tolerance into calculation. You can see that the door leaf is slightly smaller.

- Opening Oversizes: let say in the construction site, you want to make sure the 900mm door will go through easily. A different scenario is that, you want to add thermal insulation to the side of the door, or any extra framing to connect it to the wall. The Opening Oversizes will modify the actual wall opening dimension to accommodate this modification. To make sure that you will have the same door regardless of modification, this oversize will not be counted toward Door's Wall hole dimension, but you can still document it via Dimension tool

I haven't thoroughly tested how it behaves in 3D under various settings, but I assume the gap will be covered anyway, isn't it?

Let me know if this explains the situation, or feel free to share your opinion under your work practice. I'm interested in hearing about this!

Thank you for your contribution!

Best regards,