How to stucco with a slate roof ?

I appreciate the fact that you answer anyone's questions as I am at a loss.. I am building an 11,000 square foot house which will be stuccoed entirely. I have 63 windows and doors made of Spanish Cedar.

My stucco guys is using La Habra with a Sand Finish. We like the look of the old cracks etc. We are not using expansion joints and we did not leave the space around the windows. He is going to use an elastomeric caulk to fill the gap between the stucco and the window. I'd like to know if we made the right decision so far?

My next question is that my Stucco guy has said from the beginning that he wants the slate roof on and the sheetrock installed before he puts up the stucco because the weight could cause it to crack. I thought that sounded like a good idea. The roof is on and actually the roofer cannot complete the job until the stucco is on. He has asked for the stucco guy to start.

Black waterproofing must be chipped.

A painted one by is put at the bottom of this dormer. Flashing is put on that allows flashing to be slid under when the roof is done.

Here counter flashing is put on this dormer allowing the stucco to be finished. A pre-painted one by six is put on, providing a gap and a nailer for the step flashing when the slate is put on.

The dilemma is if the slate is on first, the slate cannot be walked on without breaking the slate (Spanish tile is worse). BTW we have tricks for walking on slate and Spanish tile.

The solution is to counter flash the dormers and chimneys first like above, finish the stucco on the dormers and chimneys, put the slate on the roof, come back and stucco the main house later. This avoids the weight of the slate bowing the studs and cracking the stucco. I insist on having the roof loaded down, at least for the most part, before lathing, if it is heavy, like spanish tile or slate.