Insulation, Radiant and Vapor Barriers - Vapor barrier what do I do? bathroom, old house

I live in Montreal Canada,cold. I have an old house that is covered with acrylic, foam underneath, then tentex, then the original wood exterior which was not taken down before putting the acrylic up.. I am working in the bathroom. I have taken the walls down. I am thinking of putting styrofoam, then plastic then the gyprock. I am questioning the two layers of foam insulation with the space inbetween. There appears to be already a problem since there was no vapor barrier there before only the foam which seems to have acted as one. What can I do?
Thank you.

Usually, a vapor barrier is on the exterior of the heated space, not the individual room. You would not install two barriers, to avoid trapping moisture between them.

I conclude that "acrylic, foam underneath, then tentex" means that you have vinyl siding, closed cell foam insulation, then some sort of housewrap such as: tyvek. If this be the case, you have the vapor barrier consideration covered.

You mention that there appears to have been a problem, but don't reveal what the problem is.

Usually, a vapor barrier is on the exterior of the heated space, not the individual room. You would not install two barriers, to avoid trapping moisture between them.

I conclude that "acrylic, foam underneath, then tentex" means that you have vinyl siding, closed cell foam insulation, then some sort of housewrap such as: tyvek. If this be the case, you have the vapor barrier consideration covered.

You mention that there appears to have been a problem, but don't reveal what the problem is.
Hi, There is no tyvec wrapping around the house, only the styrofoam as an underlayer for the acrlic finish, the new stucco. My problem that I noticed was at the level of tentex covering the old wood exterior. It was wet. It could have been coming from the roof with the meltdown ofsnow and ice with no where to go. Or because the is no vapor barrier under the gyprock so the condensation takes place against the styrofoam exiting the house. I noticed this because I opened the wall in the bathroom where there was a window opening filled with styrofoam andfiberglass. I am afraid it is wet all over the house. There were mold problems, and the house smells funny.

D.