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Monday, August 30, 2010

Revit: Changing the Offset of a Column Affects its Grid Intersection in the Graphical Column Schedule

Source: http://revitclinic.typepad.com/my_weblog/2010/08/changing-the-offset-of-a-column-affects-its-grid-intersection-in-the-graphical-column-schedule.html

I have seen some users report that they change the offset of a column, and then when they go to their Graphical Column Schedule either the column is no longer reported on an intersection or they receive a message that "Some columns in the project are excluded from the graphical column schedule view.". Most often this occurs because the new column position is no longer within the extents of the grid range.
Let's take a look at an example. Here everything looks as expected. The column is placed on A-1 and so reports it in the Graphical Column Schedule:
GCS01

Now let's say we want to drop the column and lower the top offset by 1'. We don't receive any warnings, but now the Graphical Column Schedule is reporting the intersection as a distance from the other grid line present instead of A-1:
GCS02 

So why is this? We can open an elevation to find out. In this view we can see that when the column is dropped by 1', it falls below the extents of Grid A. The extents of Grid B still cross through the column, so the schedule reports that relationship instead:
GCS03
Now, let's drop the column by 3'. Here's where you will see "Some columns in the project are excluded from the graphical column schedule view.". When the column drops this distance it no longer crosses the plane of any grids, so there is no grid to measure from to report it in the schedule.
GCS04
 
I hope this helps!

Original: Changing the Offset of a Column Affects its Grid Intersection in the Graphical Column Schedule

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