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Sort of built my own, - one layer of sheathing, two layers of R-Max, with offset seams, all taped with some serious 30-year-minimum tape, then foamed all edges and interfaces, and vent pipe incursions, then another layer of sheathing, more sealing, and then EPDM over all of it, sealed on all...

For the addition on the house and the wood shop I built non-ventilated, super-insulated, cathedral ceiling style roof assemblies, insulated with an effective R-58 to R-62 (depends on seasonality and outside to inside delta, as insulation loses its capacity at very high and very low temperatures)...