Are they just cement, period ? Tyvek is used aroound here to seal off
the inside layer from the outside layer, so to speak. Like if a brick
house is being built, they frame it first, then tyvek it (usually
wrong), then put the brick veneer up. For vinyl, same deal. If you
just gots the concrete walls it wouldn't seem to make any sense. If
you have framing inside the concrete walls, like to put drywall onto,
I'm not sure or not if it makes sense.

Is this new construction ?