So which is it? Which one of these dimension strings is correct?

The answer is not ALL OF THEM like answering a trick question. Our Models should be accurately assembled. When we place a wall or door or any element in the model it should be in the exact location it is supposed to be, not “kinda close” or fake the numbers.

We depend on accurate locations so we can conduct clash detection and thus try to reduce issues in the field. Isn’t that why we are using BIM in the first place? We are working toward better coordinated documents and then smoother running construction will naturally follow.

Rounding Dimensions should not occur typically. So when is it OK? There are rare circumstances at specific locations where a dimension to a manufactured item may give you a crazy fraction. The contractor does not want to see 3′- 2 57/256″. ​ And honestly it would show your lack of construction process to leave that dimension in the drawing.

So, for the rare circumstances.. here is how you do it.

1. Duplicate the dimension style that you typically use (the one that does NOT round at all).

2. Name it something you will recognize when you need it.

3. There are MANY settings to the dimension style, but what we are looking for is the Units Format.

4. The dimension style will be set to ‘Use project settings‘ typically.. you need to uncheck that box to change the settings on this specific dimension style. You can set the rounding in a simple dropdown in the Units settings.

Done. Your new dimension style is ready for you to use at your discretion.

​I can’t emphasize enough how important it is to ONLY do this for rare circumstances. If you are being asked to ‘fake’ and round the dimensions regularly.. there is a serious problem with your Revit/BIM workflow.. and you will need to turn that around quickly before the dimensions come up short.

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