All posts by Daniel Overbey

Clarifying Slab-on-Grade Insulation in ASHRAE Standard 90.1

Green Building

Clarifying Slab-on-Grade Insulation in ASHRAE Standard 90.1

Originally published on April 8, 2019 by BNP Media through the Building Enclosure Blog. Slab-on-grade insulation. It seems like it should not be so complicated. Yet, slab-on-grade insulation can be arranged in a number of configurations, each with pros and cons. One arrangement may be more conducive to maintaining a continuous thermal barrier from a wall down through its foundation but it allows unsightly exposure along the building perimeter. Another configuration may better conceal the insulation yet it allows an….

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Is Integrated Project Delivery Dead… or Just Reborn?

Green Building

Is Integrated Project Delivery Dead… or Just Reborn?

Originally published on March 19, 2019 by BNP Media through the Building Enclosure Blog. It was supposed to usher in the next generation of high-performance projects – where silos would be destroyed, building information modeling (BIM) would be harnessed, and both risk and reward would be shared across all major stakeholders. Integrated Project Delivery (IPD) has been touted for its many potential attributes. As a collaborative project delivery method, IPD utilizes the talents and insights of all project participants through all phases….

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Gauging the Impact of Exterior Shading using the Projection Factor

Green Building

Gauging the Impact of Exterior Shading using the Projection Factor

Originally published on February 15, 2019 by BNP Media through the Building Enclosure Blog. The solar heat gain coefficient (SHGC) is a ratio that defines the amount of solar energy that reaches a glazing assembly (including both the glass and frame) with the amount that gets through to the inside. It represents the ability of a glazing assembly to resist heat gain from direct solar radiation. A high SHGC indicates poor resistance. That means most of the solar radiation arriving to the window or….

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Why the 2018 IgCC is Critical to the Future of Green Building

Green Building

Why the 2018 IgCC is Critical to the Future of Green Building

Originally published on January 23, 2019 by BNP Media through the Building Enclosure Blog. It has been nearly half a decade since the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE), the American Institute of Architects (AIA), the International Code Council (ICC); the Illuminating Engineering Society (IES); and the U.S. Green Building Council (USGBC) signed a Moratorium of Understanding to better align green building goals through ANSI/ASHRAE/ICC/USGBC/IES Standard 189.1, the International Green Construction Code (IgCC), and the LEED certification system. For years, these groups had been working on their owner….

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Blue Roofs are Essential to Achieve Zero Rainwater Overflow

Green Building

Blue Roofs are Essential to Achieve Zero Rainwater Overflow

Originally published on November 30, 2018 by BNP Media through the Building Enclosure Blog. In their latest Infrastructure Report Card, the American Society of Civil Engineers (ASCE) gave our domestic wastewater infrastructure and average grade of D+ citing 772 communities in the US in which wastewater and stormwater drain into the same treatment system. These combined sewer systems can experience capacity issues following heavy rain events, resulting in overflows containing a combination of stormwater with untreated human and industrial waste, toxic substances, debris, and other….

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The Proper Ventilation Rate for an Indoor Environment

Green Building

The Proper Ventilation Rate for an Indoor Environment

Originally published on November 9, 2018 by BNP Media through the Building Enclosure Blog. Ventilation rates in our buildings can be a complicated subject and there is no shortage on ways to assess how air is brought into an indoor environment. Yet, a basic question that commonly emerges is simply: How much ventilation should I provide in a building? ANSI/ASHRAE Standard 62.1 When it comes to defining minimum ventilation rates in buildings (except for low-rise residential), the premiere reference is ANSI/ASHRAE….

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The Health Impacts of Indoor Relative Humidity

Green Building

The Health Impacts of Indoor Relative Humidity

Originally published on October 1, 2018 by BNP Media through the Building Enclosure Blog.   In many parts of the U.S., homeowners with basements have to manage rising humidity levels for most of the cooling season. It is not uncommon for such individuals to have a dehumidifer running full-throttle in the basement from April through October. High indoor humidity levels has been associated with the growth of fungi, such as mold, among other irritants. The EPA suggests keeping indoor relative….

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Clarifying Energy Simulation Aided Design: A Look at ASHRAE Standard 209

Green Building

Clarifying Energy Simulation Aided Design: A Look at ASHRAE Standard 209

Originally published on September 5, 2018 by BNP Media through the Building Enclosure Blog. ANSI/ASHRAE Standard 209-2018, Energy Simulation Aided Design for Buildings Except Low-Rise Residential Buildings is the product of a half-decade of inertia within the building design and construction community toward leveraging energy modeling a design tool through a project. Standard 209 outlines the minimum requirements for providing energy design assistance using building energy simulation and analysis. To this end, the standard defines a range of minimum criteria from energy modeling requirements,….

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How to Make Building Energy Models More Accurate

Green Building

How to Make Building Energy Models More Accurate

Originally published on August 13, 2018 by BNP Media through the Building Enclosure Blog.   I’m asked regularly about the discrepancies between modeled and measured building performance. At first blush, one might suspect that the building energy model (BEM) itself contains bad information. That notion could very well be correct! BEM inputs require a certain level of synthesis, interpretation, and assumption. But there are many other reasons why the BEM results may vary significantly from measured performance outcomes on a completed project. In basic terms: Actual weather in….

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Beware of Galvanic Action (It’s a Thing)

Green Building

Beware of Galvanic Action (It’s a Thing)

Originally published on July 10, 2018 by BNP Media through the Building Enclosure Blog. The concept of “galvanic action” is confounding to many design professionals. In simple terms, galvanic action refers to the corrosive effect created when two electrochemically dissimilar metals are in direct contact with each other. Their contact creates a conductive path for electrons and ions to move from one metal to the other. As ions move from one metal to another, corrosion occurs. The remedy is to….

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