Hello there; When you download and open the project I sent you, does the cross geometry form properly on the roof? If it does, continue with the model I sent you. Because you are using 8 versions, there may be an error in the old version. Since there is no such problem in v10, we cannot produce a retrospective solution. If the crosses are not formed properly in the model we sent, you need to enter the roof crosses with a single cross command. Good work.