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Re: Revit 2013 : Change the level of floors without affecting MEP model.
have you copy/monitored the architectural levels? if so, they should change to match for you. if you've placed your own levels, you can align and lock them to the arch levels in an elevation view. the problem is, wall devices like receptacles and such won't change based on the floor moving. for instance, if they raised the 2nd floor level up 6", your receptacles will be at 12" above floor instead of 18" like they were set previously... last time this happened to me (it was only a 2 story bldg., so wasn't so bad) I cut a wireframe section thru the entire building, and grabbed a thin window of all the devices that were now at 12" and changed them to 18" (you might have to filter by category if it won't let you change receptacles and phones at the same time), and the same with light switches and things at 48", then another window for fire alarm devices up at 7'. they should maintain their 2nd level association, you can just edit the height offset. i'm electrical as you can probably tell, I don't know how this will affect plumbing or mechanical, or the fixes for them...