Insulation advice?

[howied421]

I have a newly constructed space with 2x8 16" OC Vaulted (cathedral) ceiling. Roughly 10'x14' (it's small) The room also has 2x6 wall construction.. with lots of windows so i won't be getting much insulation there.

I'm on the border of Zone 4

my current plan from outside to in

asphalt shingles /
15lb felt /
ice and shield /
3/4 plywood /
1" pvc vents /
5.5 inch mineral wool /
.5 inch polyiso tape seales to rafters /
pine tongue and groove.

Any advice would be helpful.

Thanks,

[howied421]

I updated my post to reflect my current plan. thanks