Recipe for Disaster Take one owner with capital budget; separate operating budget and ignore. Add one architect and heat until steamed. Expose three or more tenders, exchange parts, and trim extraneous portions. Select thinnest and discard remainder. Remove architect, save essence. Assemble subtrades, compare and trim extraneous portions. Select thinnest. Store subtrades in dark. Collect…
The Building Enclosure Core reflects a very different perspective in enclosure design. The ‘Core’ refers to all elements of the enclosure with the exception of its exterior cladding system. It is both physical construct as well as resilience exercise as it embodies the most critical elements of air, moisture, and thermal management. Traditionally the industry…
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…
On Steady State/Dew Point Assessment (Glaser Method): BS EN ISO 13788:2002 Section 6.1 This standard gives calculation methods for: a) The internal surface temperature of a building component or building element below which mould growth is likely, given the internal temperature and relative humidity – the method can also be used to assess the risk…
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…
Computer simulations rely on a variety of datasets when assessing the effects of climate on building performance. These data, and the models they power, provide an important basis for planning, design, and cost analysis. Below I describe some of the major types of climate datasets used in energy and hygrothermal modeling. Weather Years Datasets described…
“It may be set as the glory of an architect’s specification, that it shall be so clear, that the builders who from it are estimating the probable cost of the intended work, may have to ask no questions; that the specification, shall contain and exact comprehensive and proper description of the work, as it really…
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,…
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…
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…
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…
In an earlier post, we reviewed standards and implications pertaining to mold-resistant construction materials (December 20, 2013). We limited our discussion to some of the most widely used resistance tests performed under short-term, laboratory conditions. Here, we take the discussion further by examining decay resistance tests for treated and untreated wood. Treated wood products provide an essential…
The Building Enclosure 