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Hacktober WINNER - Creating a Roof/Floor from a Conceptual Mass

Thank you to everyone who submitted entries into our Hacktober competition last month. A2K is happy to announce David McKay from Urbane Projects as one of our winners. See David's Revit trick to create a roof or floor from a conceptual mass.


For creating a complicated or multi-faceted roof / floor shape, commonly from a supplied model or 3D .dwg file. We will be creating a roof in this exercise.


Create a Conceptual Mass Family

  • File -> New -> Conceptual Mass

  • Select standard template file from your system

If working from a supplied .dwg file

  • Import ‘background’.dwg file into family as below


  • Ensure “Correct lines that are slightly off axis” is unticked to be certain the .dwg reference is unchanged.

  • TIP – delete items in supplied .dwg file (by exploding) which do not need to be referenced. Ie: keep only roof elements.

  • Open a floor plan view and position .dwg file in a relevant spot to the existing reference lines (typically corner to corner).


  • Check height of .dwg file (ideally create a level related to the roof height which can be modified if required). Pin .dwg file reference in place.

Creating Reference Planes and Faces

  • TIP – as we will be placing reference points in a 3D space, it is good practice to work with multiple views open simultaneously. ie: Floor Plan / East Elevation / North Elevation / 3D View.



  • Create -> Reference – Tick options for ‘Make surface from closed loops’, ‘3D snapping’, and ‘Chain’.

  • Create a Point Element, and place in the view (typically a Floor Plan).


  • The Point Element can be moved by the X/Y/Z arrows, and will typically lock to a reference in a .dwg file. Drag the point to align with the corner of the reference .dwg file. Check Side / Front Elevations and shift the point on the Z access also.