Louie writes from Homer, Alaska: "I am insulating my 6" walls with 'faced' insulation. I have been told at the local supply store that the facing on the insulation is a vapor barrier and that putting Visqueen over the faced insulation would cause moisture to be trapped between the two layers of vapor barrier. The facing on the insulation is not a perfect fit so as to be a continuous vapor barrier like a long sheet of Visqueen is. Would it be wise to tape up the tears in the facing, and to run a strip of tape down the stud to seal up the gap between bat facings? Or would it more prudent to just put Visqueen over the whole wall?"

I would definitely put Visqueen damp-proof membrane over the kraft in your climate. Water vapor moving from the interior of the home to the exterior will be greatly slowed at the Visqueen membrane. A 6 mil thick Visqueen membrane is about 10 times stronger than kraft paper so any water vapor that passes through the Visqueen will go through the kraft paper and not be trapped between the two.