Building Paper v. Tyvek

In deciding between building paper (asphalt impregnated paper) and Tyvek for water barriers on exterior walls, I have tended towards Tyvek because the buildings we work on are not so tight at the outset. I am hearing of architects who are returning to favor building paper. My thinking for using Tyvek: it appears bulletproof, it cannot be ripped. Any material with the word “paper” in the name cannot be archival, correct? Actually wrong, because today we are removing shakes at an exterior wall reno, and that 64 year-old paper looks as good as new. May be time to rethink the choice of Tyvek.

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