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The perfect storm over stucco.(Building Sciences)(Technical report)

Publication: ASHRAE Journal
Publication Date: 01-FEB-08
Format: Online
Delivery: Immediate Online Access

Article Excerpt
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Stucco was once viewed as a cladding system that solved moisture problems. Now, it is viewed as a system that causes moisture problems. What happened? As in most things gone horribly wrong, it is a bunch of seemingly small things that come together to create an the...

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...almost unimaginable nightmare--in this case "perfect stucco storm."

Unlike most water rants, particularly rainwater rants, we are not going to talk about this being the architect's fault for not having overhangs--or this being the fault of that increasingly popular and peculiar architectural subculture--the California architect--and the viral design disease they spread called complicated building syndrome.

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We are also not going to blame the windows or window manufacturers or window installers. That is not what is going on.

We are seeing problems with stucco claddings in the field of the wall--away from windows and other architectural features. And, the buildings affected are not shacks (Photo 1). And, the problems are not limited to traditional hardcoat stucco but also are prevalent with a version of hardcoat stucco, which is a cladding type that I refer to as lumpy stucco and is more formally known as manufactured stone veneer. Think of it as rocks embedded into the exterior surface of the stucco, which makes it lumpy.

Hardcoat stucco is typically a three layer cementitious rendering (scratch coat, brown coat and top coat) applied over a building paper, metal lath and sheathing (Photo 2). Manufactured stone veneer is a version of hardcoat stucco where the top coat is replaced with an embedded thin stone veneer (Photo 3). Stucco claddings coupled with manufactured stone veneers are hugely popular because of their beauty--among other things. Unfortunately, the beauty is often only skin deep, as they...

NOTE: All illustrations and photos have been removed from this article.



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