AWC releases new report on sound transmission of wood-framed assemblies

Oct 25, 2018
LEESBURG, VA. – The American Wood Council (AWC) has released a new report on sound transmission, “Technical Report 15 (TR15), Calculation of Sound Transmission Parameters for Wood-Framed Assemblies.”

A free pdf version of TR15 can be found on the AWC website:

“As always, our goal is to make the job of code officials and building designers easier, this time by providing an empirical sound transmission model,” said AWC Vice President of Engineering Brad Douglas. “Building codes stipulate minimum performance requirements regarding noise transmission through certain interior walls, partitions and floor-ceiling assemblies. This initial version of TR15 summarizes how these code provisions apply to floor-ceiling assemblies and demonstrates how wood-framed floor-ceiling assemblies can comply with a calculation-based analysis approach.”

The 2018 International Building Code provides two parameters to establish minimum acoustical requirements: Sound Transmission Class (STC) and Impact Insulation Class (IIC). Compliance with these requirements may be demonstrated either through testing or through engineering analysis based on empirical test data from other similar assemblies. TR15 shows how to use the new AWC empirical model and may be used for analysis of wood-frame floor-ceiling assemblies to determine compliance with the code-regulated STC and IIC sound transmission parameters. 

Additionally, a free eCourse is available for viewing at the user’s own pace to provide the basis for the calculation-based analysis approach. The course is accredited by the International Code Council and approved by the American Institute of Architects for continuing education credits, and is available here.