Using the reference plane you can control the position of the extruded roof in relation to a level.
Revit 2018 modify extruded roof.
This is a general.
Roof slope you can define the slope of a roof using.
The wall must be attached to the target roof and the target roof must be a footprint roof.
Sets the level for the footprint or extruded roof.
This property is read only before creating a roof.
Modify a roof after creating a roof you can change its shape or overhang cut openings or align ridges.
Click modify create extrusion tab mode panel finish edit mode.
The work plane with which an extruded roof is associated.
If selected it means the roof is part of a room boundary.
Create roof by extrusion by footprint and modify roof.
If not selected it means the roof is not part of a room boundary.
You can join a roof to the top face of another roof and the wall below that roof if you select the wall as the target.
To raise or lower the roof from the reference level specify a value for offset.
Create a roof by extrusion creates a roof by extruding a profile that you sketch.
You can join roofs to other roofs or walls or unjoin them if they were previously joined.
If you want to change the position of the roof use the properties palette to edit the base level and offset properties to change the position.
To view the extrusion open a 3d view.
Edit the roof sketch double click the roof or select the roof and click modify roofs tabmode panel edit footprint or edit profile.
Revit places a reference plane at the specified offset.
Revit completes the extrusion and returns you to the view in which you started the extrusion.
Create roof by extrusion by footprint and modify roof.
Sketch the profile of the roof as an open loop.
Join roofs you can join roofs to other roofs or walls or unjoin them if they were previously joined.
To assign a solid extrusion to a subcategory under identity data for subcategory select a subcategory.