November 14, 2011
Nation's Building News

The Official Online Weekly Newspaper of NAHB

Dec. 6 Seminar Looks at Roadblocks to Increasing R-Value of Exterior Walls

A day-long symposium to teach home building professionals how to overcome design issues, moisture problems and other roadblocks to increasing the R-value of exterior walls will be held on Tuesday, Dec. 6, during the annual EcoBuild America conference at the Walter E. Washington Convention Center in Washington, D.C.

NAHB Research Center staff members will moderate and serve on the panels of a number of discussions on the performance of high-performance light-framed walls. The discussions are being hosted by the National Institute of Building Sciences Building Enclosure Technology and Environment Council (BETEC).

Because walls can play a significant role in the energy loss of a building, they have been a primary target for enhanced model energy codes, green building programs and other beyond-code programs to improve home performance.

Most building codes now in use already require insulation in the stud cavities of light-framed walls. However, more stringent codes now being proposed and promulgated in many parts of the country require that home builders use thicker framing and/or additional insulation on the outside of the cavities.

Experts at the symposium will discuss the proposed changes in wall construction and focus on potential conflict with code requirements, constructability concerns, cost and other unintended consequences — including moisture and durability issues.

The sessions include:


'National Green Building Standard’ Available at

The National Green Building Standard,” available through, provides “green” practices that can be incorporated into multifamily and single-family new home construction, home remodeling and additions and site development.

The standard covers lot design, resource, energy and water efficiency; indoor environment quality; and owner education.

Currently the first and only ANSI-approved green building rating system, the National Green Building Standard is the benchmark for green homes.

To view or purchase this publication online, click here.

'National Green Building Standard Commentary' Available at

The "National Green Building Standard Commentary," available through and a companion to the ANSI approved "National Green Building Standard," that provides valuable insight to the intention and implementations of the practices and provisions found in the green building standard.

The "Commentary" is a useful resource for any designer or builder using the ICC 700-2008 as a rating system for developing or renovating residential properties of all types to reduce their relative impact.

To view or purchase this publication online, click here, or call 800-223-2665.

More Than 5,400 People Have Earned Their Certified Green Professional (CGP) Designation

The Certified Green Professional (CGP) designation teaches builders, remodelers and other industry professionals techniques for incorporating green building principles into homes using cost-effective and affordable options.

Earning the CGP demonstrates to clients and peers your commitment to the best and latest in green building practices and techniques. More than 5,400 people have earned the CGP designation to date.

For more information, visit

'Build Green and Save’ Available at

Build Green and Save: Protecting the Earth and Your Bottom Line,” available through, is a comprehensive, easy-to-read reference that shows builders how to identify and select green building materials; implement green construction techniques; explain the benefits of green housing and offer affordable green building solutions to consumers; and use resources wisely and reduce water and energy consumption.

To view or purchase this publication online, click here, or call 800-223-2665.


  • High R-Value Wall Field Studies
    1:00-2:30 p.m.
    Speakers include: Joe Lstiburek, Building Science Corp.; Andre Desjarlais, Oak Ridge National Laboratory

The symposium will close with a roundtable discussion. In addition, panelists will offer their own “five-minute philosophy” of high R-value walls, including their perspective on the practicality, implementation, durability, costs and climate-specific concerns.

Participants can earn continuing education credits toward NAHB’s Certified Green Professional educational designation, the American Institute of Architects, RESNET and other professional industry organizations.

To Register

For more information and to register for the symposium, visit the BETEC registration page.


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