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An edited version of this Insight first appeared in the ASHRAE Journal.By Joseph W. Lstiburek, Ph.D., P.Eng., Fellow ASHRAE The issues with stucco are pretty well understood and we have discussed… Read More
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Ten years ago (“BSI-024: Vocabulary”, October 2009) I issued a challenge regarding water control layers asking folks for ideas regarding a performance metric for water control layers. I suggested… Read More
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So does the air control layer go on the outside or the inside? How about both sides? How about one in the middle? Do I want one water control layer? How about two or three? Yes, yes, I know…if… Read More
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Everyone is running around sealing the outside of buildings and the term “air barrier” has gone from obscurity to buzz word in less than a decade. But if you look at the physics we are sealing the… Read More
Very Cold, Cold, Mixed-Humid, Marine, Hot-Humid, Hot-Dry/Mixed-Dry
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A little bit of history…back in the day the United States was known for its manufacturing prowess[1]. In high speed and high volume production “punching[2]” was and is the least expensive method of… Read More
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…articulaciones* y esquinas y penetraciones...much more stylish…much more interesting than English. The battle to control water entry is won at building joints and corners[1] not so much at… Read More
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“Code world” is an interesting place where seemingly convoluted language is used to express simple concepts in clearly complicated ways. The reasons for this are based on “legal” principles and the… Read More
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Huh? Blasphemy. Yeah, well, in some assemblies, it is actually a pretty good idea. The most famous "double vapor barrier" of them all is a classic compact flat roof. Check out Figure 1. The roof… Read More
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A wall is supposed to keep the outside out and the inside in. That is the way things are supposed to work. Check out the “perfect wall” (Figure 1). We have our water control layer, our air control… Read More
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With the “perfect wall” we were here way back when (BSI-001: The Perfect Wall). The perfect wall has four control layers outside of the structure:a water control layeran air control layera vapor… Read More
Pagination
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