I found a rusty trim screw and a leak in my closet. The screw was backed out about 1/8". Wondering if you guys think this is source of leak or just the exit point?
Well if it is in your closet, and I don't think it has rained in there, I would guess that it is not the source. Check outside trim for bad caulking, you probably have some wet or rotted wood behind and above the screw you found.