I'm in the midst of a new housebuild and did a bit research on the various housewraps available. I ended up using Typar. It's not just about blocking air. Some don't do a very good job with moisture- which can and will lead to the growth of mold. Just some personal experience. Building wraps have come a long ways since Tyvek. Even the home supply stores sell their own brands of wraps. Another thing to look at, especially if doing a D.I.Y. project is how well it will 'weather' exposed. Some brands will degrade significantly in as little as a month, unless covered.
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