Erika wrote: My Swedish is not good;from the picture it looks like the zone may not be tall enough, try increasing its height.
It's not the zone. ED itself calculates the interior building volume by its surrounding exteriors. I figured out the missing volume has to do with story settings. I modeled an 8 m high building on story 1 which is 3 m...the cut in volume is at approx 6-7 metres which makes no sense to me. If I up the story height to higher than the building the volume shows correctly. I'll ask GS what's controlling the calculated volume. Nice addition ED is...we also tried out Enricos tip about Velux (http://archicad-talk.graphisoft.com/viewtopic.php?t=39716) so we're in a good green mood right now.