4pAA8. Floor research project at NRC Canada: An update on progress---Airborne sound and standard tapping machine measurements.

Session: Thursday Afternoon, December 5

Time: 3:45

Abstract:

The extensive research project on sound transmission through floors is still in progress. This paper will present information on standard measurements made according to ASTM E90, ASTM E492, and ISO 140 parts III and VI. Since the last report in 1995, the effects of changing joist length, joist spacing and depth, wood I-beam type and depth, and the effect of adding concrete as a topping on the floor have been studied. Different types of subfloors and different types of gypsum board have been used in several combinations. For a given basic structure, the mass of the panels has the most effect on the single number ratings, STC and IIC, which are determined mainly by the sound transmission loss values around 125 Hz. Many structural changes have little effect around 125 Hz so STC values do not change much, although there are significant changes at other frequencies.