Jay writes again from Mesa, Arizona: "Before placing the Exterior siding, I covered the exterior with my extra roofing tar paper. Will that suffice for a vapor barrier or does it need to be in the interior surface?? Also, do drywall and paint count as a vapor barrier?"

Answer: PINK and black may be a popular color combination and I like it very much, but roofing felt paper does not qualify as a vapor barrier. Also, the vapor barrier always goes to the warm-air part of a wall unless your local code says differently. Hopefully, the interior surface hasn't been covered yet.

Drywall does not serve as a vapor barrier but there are paints that serve as a vapor barrier. Check with your paint store to get information on those products.