Rethink Your Life!
Finance, health, lifestyle, environment, philosophy
The Work of Art and The Art of Work
Kiko Denzer on Art
[Cob] Moisture Barrier Mobile HomeAmanda Peck ap615 at hotmail.com
Sun Apr 9 22:48:45 PDT 2006
I hear from some more-or-less natural builders that Tyvek in particular has benefited from an inflated reputation. Typar may be a bit more breatheable, but--see below. They seem to be using the felt as easier to handle (nine foot wide rolls sound a right unpleasant to stretch evenly across anything) and maybe better--at least more of a history. Here is one of a series of articles from the University of Massachusetts on a handful of building subjects. He does like the 15 pound felt. Some people seem to like it because it does wrinkle. http://www.umass.edu/bmatwt/publications/articles/leaky_housewraps.html "I ... remain convinced the leading cause of water damage is poor design. Proper flashing and the integration of flashing with an able housewrap are perhaps the most critical details enabling walls to function as weather barriers. .......... Non perforated wraps (Tyvek and Rwrap) and 15-pound felt paper won that round by a knockout. Perforated wraps leaked like sieves. I also did some exploratory work to determine the effect of soaps (from powerwashing) and water soluble extractives (like those found in cedar and redwood) on water permeability of housewraps and determined that soaps and to a lesser degree extractives can cause wraps to leak. As promised in the November 1998 issue of JLC, I have extended the study to look at the ability of housewraps to block the capillary flow of water."
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