Heat seeks cold.

Weather the cold is on the outside or underside of your home, the cold is traveling through a certain medium (wood or concrete). To stop this you will need a thermal break. A thermal creak consists of a material that will stop or slow the cold migration. Styrofoam will work but try to get a board that is laminated with a vapor/moisture barrier on both sides. Send me your address and I will send you free samples of that material, you can contact me @ microfoil.com or call 602 528-FOIL

I would cut and install XPS foam in those spaces. Depending on your climate, moisture, and threst of your vapour comntrol package, i would avoid using a VB there as it might trap moisture and cause rot.

Excellence is its own reward!

I just read microfoils answer.He answered my question with the same exact reply here.Sounds like he`s in the sales business instead of trying to help others.I`m not downing your efforts,but be real in your answers to people.

I had the same impression that he was here to sell a specific product rather than give good advice. Sometimes a VB does more harm than good, and there are few who would be using styrafom anyway

Excellence is its own reward!