I have a metal shop building that is 30x30 and the builder wants to take out a small bow in the middle of the building on the roof. He said that he wants to add a center beam which will double the ridge beam,but he has to remove the screws in order to do that. I told him I don't want leaks afterwards. Can you remove screws put them back without leaks. I think if that same hole is screwed into a beam it will be ok. Have any you done this with good results.