Open EIFS: A Resilient 100 Year Wall

Open EIFS is an Exterior Insulation and Finish System that achieves high moisture resilience through increased drying capacity and redundant, yet practical, safeguards.  When implemented holistically, this assembly is both durable and high-performing. The concept builds upon research originally conducted by DOE’s Oak Ridge National Laboratory, which demonstrated high moisture performance in EIFS configured with…

Extreme Climatic Events

Extreme Climatic Events Provide Important Insights For Resilient Design

Extreme climatic conditions are those falling in the upper or lower tenth percentile of the local period of record. North American hygrothermal datasets rely on such extremes in simulating climatic effects on building performance. Prior to 2012, WUFI employed customized 30-year hourly data provided by the U.S. Department of Energy for the 1961-1990 period of…

Making It Green Does Not Make It Right

The principles and practices of green building have had a transforming effect on the way we build, work, and live. By ‘green’ I refer to a collective of high-performing objectives in sustainability, energy-efficiency, healthy building, and resiliency.  Inherent to its mission are claims of improved building performance – that is, perceived betterments in resource use,…

Moisture Performance Of An All-Wood R-30 Wall

Natural alternatives to foam insulation are highly desirable for high-performing wood-framed buildings.  But lignocellulosic materials can be highly bio-nutritive and moisture absorptive, increasing their vulnerability to degradation and reduced thermal performance.  Designers are often faced with the dilemma of selecting materials that are less environmentally safe for much improved performance.  In this article, I describe a…

Degradation of Fiber Cement Siding

Degradation Of Medium-Density Fiber Cement Siding

Fiber cement cladding has found wide acceptance as a durable and renewable material.   Since entering the U.S. market in the early 1990s, assumptions on its long-term resiliency have relied heavily on wet/dry cycling tests, but little is reported on its durability under typical in-service conditions.   Here we describe four stages of fiber cement degradation under…

Is TimberSIL Resilient?

TimberSIL is a glass-infused wood manufactured by Timber Treatment Technologies.  Marketed as a green substitute to conventional chemically-treated wood, TimberSIL has come under recent scrutiny for questionable performance under intended designed conditions.  We use this situation to discuss the implications of vetting new products on the basis of green material ratings. Criticisms have emerged over the product’s susceptibility to rot and poor acceptance of common coatings.  Perhaps…

Quotes: Stucco Durability

“Stucco has a great deal to recommend it in house construction, but it has also some conspicuous drawbacks. Stucco is much like the little girl who, “when she was good she was very, very good, but when she was bad she was horrid.” When properly made and applied it is durable, inexpensive to maintain, a…