If you choose truss the plate offset from base is measured from the outside of the wall.
Revit understading roof base offset.
Can be either the host or rails elements.
Select the wall and use the attach top base button to attach it to the underside of only the 5 1 2 roof.
This is the absolute base of the primary view range.
To see the effects of this property more clearly set a value for plate offset from base other than 0.
Then from the modify tab on your ribbon use the join geometry command and select the 7 1 2 roof and the wall.
Modifying revit roof slopes to change the roof from a gable roof to hip roof go into the sketch options select all boundary lines and turn on the defines slope parameter note as a default your roof will have a slope of 30 degrees on all boundaries and form a hip roof unless you change the slope designation in the sketch mode per boundary line.
Room 1 has an upper limit of level 1 and a limit offset of 4000.
And element that is on or above this height will be drawn according to it object style.
By default the limit offset is the distance between levels 10 or 4000 mm.
It will join in the wrong order and you will need to use the drop down menu next to join to switch the join order.
To indicate that it should extend upward 4000 mm above level 2 specify an upper limit of level 2 and a limit offset of 4000 mm.
Then adjust the required offset from these elements.
Defines roof slope.
In the image below the red dashed line indicate the position of the balusters.
As you may expect this is the height that revit will cut through elements ie windows doors etc.
You can see that the baluster base is 100mm from the host and baluster top is set to the.
See roof boundary line properties.
For footprint roofs specifies a roof line to be a slope defining line.
Creating complex sloping roofs in revit 2014 roof junctions controlling roof slopes and levels.
Select the base and the top of your balusters.
If you choose rafter the plate offset from base is measured from the inside of the wall.