stucco underlay/wrap

mlupa

am in the process of prepping two 18"x18" x 7 ft high pillars for a traditional 3-coat stucco job.
The pillars are 6x6 posts boxed out with OSB sheathing. My question is should I wrap the pillars in
a) 15# roof tarpaper
b) 2 layers of Grade D building paper
c) Tyvek Stuccowrap ($$$ and thicker than I may have planned)
I have seen all 3 discussed with positives and negatives and I am not quite sure which way to go. Regular self-furring galvanized metal lath will go on top of this - and then scratch, brown and finish coats of stucco.
Also while wrapping the pillars there will be a few obstructions to work around (porch rails and supporting headers) - so ease to work with is a factor and I am also curious about recommendations for flexible flashings (vinyl).

ryanh

I've always wrapped all my details in typar/tyvek paper. Never had a problem. Then again I always have a roll or some scraps around, if you need 10 feet i wouldn't go buy a 75' roll