We are building a project in ArgGis 10.2 were we create buildings using rectangles. Some of them need to be attached at one or more sides (they have common walls), so we would use snapping to snap vertex to edge to create a new building next to another. It seems to snap, but when zoomed in (1:0.3 scale) we can see that they are not snapped. at 1:1 looks good, but if we look even closer we see that the lines or point are not joined.