Brass screws it is then , I am sure in 50 years or so someone will be cursing me for using brass screws as they round off like cheese when they try to remove them.
If you want a 50 year life then don't use brass, use stainless - the usual spec. is A4 rather than the A2 mentioned.
Get them from 'A2A4' or 'Anglia Stainless' for example.
Unless the oak is really green you will need to predrill for most screws.
Whatever you used or intended to use would have been correct.
There is no way anybody could have guided you as to how they would have been done when your cottage was built. barge boards didn't exist then.
( I would have used stainless steel screws with green oak, nails tend to pop out ( sometimes ) as the wood goes through the seasoning process and distorts. If that happens just pull them out and use screws.)
No worries Middi, I've left the heads of the nails out from the timber a bit in case I needed to switch over , also in case I had to move any section of board. It wont be too difficult to pull them out and replace with screws.
That oak you commented on that was laying on my path when you came to visit is now attached to the kitchen roof below the shingles and looks fantastic. I left it unplaned and rough ,I just have to give it a good clean and it should weather down to a lovely silver colour over the next few years.
Just have the gable ends to do now.
Surely you are not concerned about some extremely fussy CO gathering forensic evidence to find out who was the vandal that fitted those barge boards. :lol: