I am in the midst of some home renovations including new vinyl siding. My home has Tyvek that is 20 years old. Most contractors seem to recommend the 1 inch Dow foam board for added R-value. However, I have read there can be some long term problems in allowing the house to breath. Recently I have heard about Low E house wrap which is more breathable, easier to work with and also reflects radiant heat which foam board does not. It also has about an R-4 with half the thickness. Any info on anyone's experience or suggestions would be helpful.
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Check out this product and let me know what you think. I supposed to be man all in one improvement. It supposedly has been used in commercial buildings for years. http://www.low-e.com/Pictures/WebPDF/PDF/8009.pdf