if you have to seam cedarboards do you cut both on a 45 degree angle because of water, the 1×6 t&g clear cedar boards are being installed vertical, thanks for any help
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If not a straight horiz. line where I'd use z-flashing........
.............or a nice looking water table detail.
then I would bevel (whatever stop's 30-45 were on my scms) and seal the cuts. I think I'd slather titebond 3 on the joint-seal and if lucky-glue up in one step.
Not a great detail running it like that-water entry in the T&G is tough to prohibit. Make sure ALL sides back etc are sealed/primed/finished (pick one).
Later thought: I'd think something 22.5 or 30-less surface area of end cut, yet would still try to shed water. And don't forget, the uphill board would bevel OVER the lower. Believe me, I've seen some failures where it was the opposite-like an open mouth looking for a drink.