When you have roofs above your walls it is easy to attach the top edges of the walls to the underside of the roofs and enclose the geometry.
Walls locked to roof revit.
Revit lt displays a pushpin control near the element to indicate that it is pinned in place.
See hd version of video tutorial here.
Select the elements to which the wall will attach.
Revit introductory tutorial showing modelling of a basic house.
Http pbl stanford edu how to attach walls to roof objects in revit.
On the options bar for attach wall select either top or base.
When creating a wall a lock icon appears allowing you you lock the wall to another element eg.
Likewise if you unlock a previously locked wall and then try to lock it again no lock icon.
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Click the pushpin again to lock the element.
In the drawing area select one or more walls you want to attach to other elements.
To move or delete the element you must first unlock it by clicking the pushpin control.
However if you create the wall move on then come back and try to lock the wall no lock icon.