I'm going from memory, but I think the normal way to do that is to have built a sort of ladder-shaped assembly out of whatever your rafters are made of, so that there's an actual rafter out there under the end of the decking. If it's too late to do that, or the design makes it undesirable, I'd at least run a board flat on the underside of the decking and attach the deck and then barge-board to that.I am building a porch. The roof decking is 1" wide boards extending 14" out from each side (gable ends). I'm about to attach 1x6 fascia boards, and am wondering if it's ok to nail them into the end grain of the 1" board, flush with the top of the roof planks. The purpose is not only appearence but also to keep the roof boards in a straight line and prevent them from warping. I will also add some lateral support 2x6 attached to the fascia and to the inside rafter.
Thanks,
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