Carpentry question regarding shingles on a single layer tongue & groove roof

Man, that's a hard one. TandG over rafters, decking over that then shingles or sheet is gonna be costly. Plus where is the best place to lay the paper?
Rich people problems.

Short roofing nails will be fine.

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This or just nail your T&G to the bottom of the rafters, OBS on the top of rafters.

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If you are going to add the OBS anyway why not add it directly to the deck board and double up. I like the look of the exposed rafters. OSB is cheap anyway, that can't add much to the cost of the project...

Right, if I add anything it wold be above the t&g.

Adding 1/4" plywood would add $130 to my bill. The t&g+1/4" ply+tar paper+shingles would allow for 1" nails. Should work.

I wouldn't normally recommend shorter nails but with your plan to deck over with extra wood might work since you are adding additional sub-straight to attach to.

Another option is cover from underneath by either plywooding the rafters or joists.

As far as a metal roof, I am pretty sure you cannot space the seams like that because you must strip out a roof with something first. Either plywood or solid wood firing is needed before the metal is attached with screws. The screws would be much less visible though. I love metal roofs.

If I went metal roof I would strip it w/ 1x4's at 12" oc and screw there. That at I'd be screwing through 1.5".

I don't like how the nails look sticking out and it also splinters the wood underneath. My house has a t&g roof and the underside (the part you see inside the attic) is chipped up from the nails.

buddy of mine built a cabin on his property with fabulous cypress t&g and exposed rafters. What he did was put tar paper down on the top side of the t&g cypress with short nails, put 2x4 joist directly on top of the papered cypress, then a plywood deck with tar paper and shingles above that. It is a double layered roof with a 2 inch gap which allows direct air circulation between the layers. That way he preserves his beautiful t&g cypress from moisture and heat warp, and also puts a conventional, wind resistant roof deck over the structure without requiring an attic space for circulation. He had to screen the gaps between the two layers to keep bugs and birds out. The end result is a solid structure without any nails poking through.

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Yeah, no way I'm doing that. This is an open air deck.

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Then just nail your shite down with little nails and keep a couple of squares of shingles handy for any serious storms.

Going to put slate tiles on top?