Energy Efficiency and Durability of Wall and Roof Systems
presented by Andre Desjarlais, Oak Ridge National Laboratories
Thursday, May 22, 10:15 AM - 10:45 AM
Hall of Mirrors
Session: Performance of Air Barriers

According to the Department of Energy's Buildings Energy Data Book , buildings are responsible for 41 percent of all of the energy used in the United States and walls and roofs. Of this, approximately 47 percent is used for space heating and cooling. The walls and roofs of buildings are primarily responsible for this energy use; any improvement in their performance can yield appreciable reductions in energy demand.

As building standards up the insulation requirements for buildings, air tightness becomes a more critical issue. Air tightness has been estimated to increase heating and cooling loads between 33 to 50 percent. Air tightness not only impacts energy efficiency but also the durability of the wall or roof as air moving through the building envelope component can deposit substantial amounts of moisture within the construction. For the past several years, the Oak Ridge National Laboratory has been investigating these issues. A summary of projects performed on roof and wall systems will be discussed.

Learning Objectives:

Types of products that can be deployed as air barriers.

How to test for the impact of air leakage on energy performance.

Impact that air leakage has on energy efficiency of roofs and walls.

Where does air actually leak through a building envelope component.

Speaker Bio:

André Desjarlais is the group leader for the Building Envelopes Research Program at the Oak Ridge National Laboratory (ORNL). He has been involved in building envelope and materials research for 40 years, first as a consultant and, for the last 22 years, at ORNL. He is active in the building industry, participating in ASHRAE, ASTM, Cool Roof Rating Council, SPRI, RCI Foundation, Roof Industry Committee on Weather Issues, Federal Roofing Committee, and the Building Environment and Thermal Envelope Council. Areas of expertise include building envelope and material energy efficiency, moisture control, and durability.