i would think most ybs hit the roofs at some time while they
are learning to fly and first time out,but as mentioned its up
to you to get them under your control,i use a old hen that
does not hit the house roof, also they are keep abit hungry
if they do go on the house i whistle them and hopefully they
come down.its once they are flying bunched up that you what
them to hit the loft thats why you have the fantail? as a drop bird.
also once they finish flying call them straight in so they get use to
trapping quick.the method we use is let out,fly,down and straight in
no picking about.
other members have different methods get one that suits you.
all the best for the coming season m8
paul