The following report contains the Transmission Loss (TL) results measured in accordance with ASTM E90-09 of 8 cross-laminated timber (CLT) wall assemblies and the TL results and normalized impact sound pressure level results measured in accordance with ASTM E492-09 of 26 CLT floor assemblies and 3 glulam floor assemblies.

Reference tables containing the specimen number, sketch, short description, rating(s) as well as the page number of all the assemblies tested are found starting on page 16.

The wall assemblies were built and tested between November and December 2014. The specimen descriptions and the reported mass per area of the 8 wall assemblies that were previously published under report numbers A1-006070.1 to A1-006070.8 have been revised in this report.

The floor assemblies were built and tested between December 2014 and June 2015. The specimen description and the reported mass per area of floor specimen A1-006070-11F that were previously published under report number A1-006070.9 have been revised in this report.

The following discussion section contains analyses and graphical comparisons of the tested wall and floor assemblies used to highlight key findings:

In-situ TL vs. Laboratory TL Results

2. TL Results of Current Bare Assemblies vs. Previous Assemblies

3. TL Results of Walls vs. Floors

4. TL Results of CLT Walls

5. TL Results of CLT Floors

6. TL Improvement of Toppings and Resilient Membranes

7. TL Difference of Poured vs. Precast Concrete Topping

8. TL Interpolation for Floor Toppings

9. TL Improvement of Floor Coverings

10. TL Improvement of Hung Ceilings

11. TL Results of Glulam Floors

The last three pages of this report contain additional test setup information for each facility. APPENDIX: ASTM E90-09 – Airborne Sound Transmission – Wall Facility APPENDIX: ASTM E90-09 – Airborne Sound Transmission – Floor Facility APPENDIX: ASTM E492-09 – Light Impact Sound Transmission – Floor Facility