Rounding errors can be a problem which is why the smallest tolerance allowed is used. Typically when EQ./EQ. is used small fractions are created.

Here is a trick to help cleanup the dimensions that aren't exact-

  • Create a tolerance dimension style if it doesn't already exist. It should be labeled similarly to the original style- but suffixed similarly to "(1/8 TOL)". This is a *special* temporary dimension which reflects the tolerance bound within a particular dimension style(1/8" typically).
  • If needed- create a continuous dimension string (Try to avoid individual dimensions if you can). You can select entire walls utilizing dimension options to define the 'how-to" for these strings and edit the witness lines as needed.
  • Make a copy of the dimension string you want to correct.
  • Change the copied dimension string to the tolerance style.
  • The alternate string will show a rounded value closer to the correct tolerance:

  • Cleanup by selecting the objects you want to adjust.
  • Start from established references like gridlines you know are accurate.
    • To change a dimension (From Revit Help):
    • Select a component that the dimension references.
    • Click the dimension value.
      If the dimension is locked, the lock control appears next to it. Click the lock control to unlock the dimension so you can change it.
    • In the edit box, type a new value for the dimension and press ENTER.
  • Rounding cannot be used in the dimensions as rounding errors will occur.
  • If all dimensions within a string are an accurate representation of values rounding errors should not occur.


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