Hello there; Since the lengths and directions of the elements on the roof are not compatible, these situations are encountered if you do it with a macro. For proper placement, you need to model your purlins and enter their combinations with a single purlin command. For this, while the beam is selected, set the mouse to be on the beam and right click, use the create special capture point on the object command from the opened tab. You should act this way, the only problem in your 1st image is not the combinations, the lovers are not placed properly. After modeling your lovers as mentioned above, you can create the joins with the purlin combination macro in the joins. Good work.