The oak -if oak they be, are purlins.
Obviously, I'm just assuming oak.

Getting good photos before you do the job will not only get you more confidant help
but provide you with a record of stability over the years you remain
there.
OK, I've got "some" photos;

http://www.photobox.co.uk/album/albu...c_album=727733

But what's my next move?

Thanks,

John