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Thread: Net Internal Area Calcuation

  1.    #1
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    Net Internal Area Calcuation

    I am trying to get the NIA of a building. I create an area plan and select NIA but Revit does not seem to calculate the internal walls. It only gives me the option to set an area boundary on the perimeter walls. Is there somewhere I can set area rules because it seems like it doesnt matter which area plan I pick , gross, NIA or GIA because I will have to draw the boundary lines manually anyway. I hope I'm missing something but would appreciate if someone could help me out on this.
    Thanks

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    Moderator cellophane's Avatar
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    The auto area line function isn't that great. IMO - just place the lines manually (uncheck the Apply Area Rules box). You get exactly what you need that way and don't waste time trying to make it do something it can't.
    d.stairmand likes this.

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    Moderator Robin Deurloo's Avatar
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    +1 on that.
    I never trusted the automatic area thingy in Revit, neither of internal of Gross area.
    Takes more time going over everything then to just place the lines manually if you ask me.

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    Member PatrickGSR94's Avatar
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    The Automatic function goes by BOMA area calculation standards, which offsets the line at things like doors and windows, per the building area calculations set forth by the Building Owners and Managers Association. Which means it really doesn't give you a proper calculation for things like IBC-defined Gross Floor Area, which is simply to the inside face of the exterior walls (like Rentable area but not offsetting at glass and windows).

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    ...and watch it with curtain walls! Floor area is measured to CW centre line.

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    Member PatrickGSR94's Avatar
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    Quote Originally Posted by john.warburton View Post
    ...and watch it with curtain walls! Floor area is measured to CW centre line.
    Odd, mine aren't doing that. I just drew a wall with a window and then an embedded curtain wall. Made a Rentable area plan with automatic area boundary line creation on external walls. The line offsets to the inside of the glass at the window, but runs straight along the main wall past the curtain wall which is actually not correct for BOMA calcs I think.

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