a vapor barrier typically is a sheet of plastic or tarred paper. Any home hardware type store will have that, just as for vapor barriers for home building. The works should know what it is. If I recall correctly, you put the vapor barrier between the outer covering of the house (ie siding, bricks etc)and the insulation/frame but i am no expert, just trying to remember from half built walls of houses I have seen in the past.
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PHLdyPayne

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