Can you help? When I draw a building lines show through from another room is there away of making these lines neutral.
Or so they will not interfere with render of an area
Could you show us an example? Is it just that you have Back Edges turned on? If so, turn them off under View>Face Style. Or by hitting K which is the default keyboard shortcut for toggling them.
There are several things that could be happening, and as Dave has written, we’d need to see an example to tell which. It could be simply a matter of view style, such as back edges, wireframe, or xray. It could also be that you have no/little thickness to the walls and edges are “bleeding through” from behind.