Contributor
Hard to tell from the picture, but perhaps reconsider using batt insulation. With that blocking, having continuous venting from soffit to ridge looks challenging. If non vented consider spray foam that will act as an air barrier and prevent rot/condensation issues. Looks like the entire space will be conditioned so that space is a good candidate for it.
Contributor
Disclaimer: Not an expert but have done my own research on modern building science, made my own decisions, and implemented them in my own shop.
My shop has a mini split and I also elected to put in a dedicated dehumidifier, more than anything for comfort and to keep humidity at or below 50% to protect my tools. For my roof, and for that matter my walls, I put rockwool in the cavities. So it is very similar to yours including the cathedral ceiling. What I did next is put up an interior layer of osb and rolled on a layer of liquid applied air barrier (prosoco). Since my shop is not lived in there is nothing other then myself adding additional excess moisture to the air beyond ambient. The prosoco is preventing any moisture laden air transfer to the insulation and roof deck. Lastly, the mini split and dehumidifier enable it to dry to the inside year round without me ever having to think about it.
On top of the osb I have a lay in of green glue, drywall, then a layer of cheap engineered oak flooring glued to that. The extra middle layer was because of my proximity to my neighbors and being in an hoa. It paid off though because you can’t hear anything coming out of my shop beyond 10ft away. So I can happily work away at 12am and no one knows.
Contributor
OP still has not revealed his climate so we are shooting blind. Maybe he is in the high desert and not too concerned with moisture only radiant heating through the roof. I see no mention of heating.
Bill D
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