Community: GBA Pro help

I an an insulator and a little confused on the subject of vapor retarders for ceilings. Normally we do not put a vapor retarder on the ceiling for Zone 5. But we are doing a job for someone that is enclosing their swimming pool and I am concerned that with that much humidity it might be necessary. They are installing an air-exchange unit of some kind but I do not have any details on that at this time. If this question has already been answered, can you please direct me to that thread?

Thank you

Hello,

Not sure if I chose the right category to ask this question. I apologize if it’s misplaced.

I installed a kitchen island hood last summer with 6" exhaust duct straight up through the ceiling into the attic and through the roof in a bangalow. Location - Toronto Canada. I assume it's a zone 6. The duct was inside insulated sleeve.
Now that the winter is here and temperature changes sometimes 10 degrees in one day occasionally water is leaking from out of the hood.

About to begin work with local devleloper who is going to build homes using magenesium oxide SIPS. Claims that magnesium oxide panels are the "dry wall" of China. Have reviewed mock up w/ out staff architect and the material looks sound enough. The concept is sound, but has anyone ever heard of magnesium oxide panels or used them? Anyreferences would be helpful. Thanks.

I’m working on the design of a two story house in Climate Zone 5 for a client with a somewhat limited budget. (I’m attaching a dwg showing the schematic section)
There are a number of different conditions in the house.
The main roof over the Second Floor will be a low slope EPDM roof pitched at ¼” per foot. The ceiling of the second floor is located at the bottom of the trusses.
There is a small portion of the house that is one story and covered by a shed roof with a metal standing seam roof that meets a higher wall.