Design and Characteristics of a Novel Lightweight Insulating Concrete (LWIC) for Low Slope Roof Decks, Floor Leveling and Acoustical Insulation
presented by William A. Kirn, Quest Construction Products and David W. Yarbrough, PhD, R&D Services, Inc
Wednesday, May 21, 3:15 PM - 3:45 PM
Hall of Mirrors
Session: Reflective Roof Coatings and Systems

Light weight insulating concrete (LWIC) has been used for decades in the roofing industry as a proven technique to provide thermal insulation and create positive drainage on low slope (flat) commercial and residential roofs. These materials are divided into two types: cellular and vermiculite containing. The cellular type employs the addition of a polypeptide (surfactant) to the material, which when mixed at high speed, entrains air, hence the name "cellular". The second type employs the addition of ordinary vermiculite as a light weight insulating aggregate to achieve some minimal thermal insulation properties.

A new type of insulating concrete material has been developed for use as roof decking for commercial and residential low slope buildings, and to level and provide thermal and acoustical insulation for interior flooring applications. The new material, a novel type of light weight insulating concrete, has the performance, structural integrity and mechanical properties needed for applications in the most demanding environments. The low density concrete-composite has thermal properties that satisfy code requirements with thicknesses that compete favorable with existing systems. Physical, thermal and acoustical properties will be discussed in this paper along with a review of typical performance data.

Learning Objectives:

  • Identify the various types of lightweight insulating concrete.
  • Understand the installation procedures for lightweight insulating concrete.
  • Understand the unique features and benefits of the "Custom Roof Insulation System," lightweight insulating concrete.
  • Understand the basic concept of "Dynamic Benefits of Massive Systems."

  • Speaker Bio:

    William A. Kirn is Manager-Product Development for Quest Construction Products. Kirn has over 30 years’ experience in the roofing industry, ranging from product and roof design, development, and materials testing to expert witness, installation, and on-site field inspections and condition reporting.

    He is a Registered Roof Consultant and was on the faculty of the Roofing Industry Educational Institute. He is active in the Polymeric Materials Subcommittee of ASTM D-08 (Roofing and Waterproofing) and E-06 (Building Performance). He held the inaugural chair on the technical committee and is a past member of the board of directors of the Cool Roof Rating Council (CRRC) and a member of the Construction Specification Institute. Kirn is past president of the Reflective Roof Coating Institute. He also serves on the board of directors of the Energy Coordinating Agency in Philadelphia, a nonprofit corporation whose mission is to assist older and low-income residents with energy needs.

    Kirn holds a Bachelor’s Degree in Chemistry from Temple University, a Masters in Organic Chemistry from St. Joseph’s University, and an MBA from Temple University.