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Apparent sound insulation in mass timber buildings

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.4224/40001816
AuthorSearch for: 1; Search for: 1; Search for: 1; Search for: 1
Affiliation
  1. National Research Council of Canada. Construction
FormatText, Technical Report
EditionSecond edition
Physical description204 p.
SubjectASTC; CLT; DLT; NLT; laminated timber; flanking; apparent sound transmission class; lining; mass timber; cross-laminated; timber; nail-laminated; dowel-laminated; NRC; National Research Council of Canada; sound transmission; building; acoustics; sound; structure-borne; building acoustics; RR-335; RR-331; loss factor; wave number; transmission loss; NBCC; National Building Code Canada; worked examples; Kij; vibration reduction index; radiation efficiency; ISO 12354; ISO 15712; statistical energy analysis; SEA; wood; topping; neighbour noise
Abstract
This Report presents the results from experimental studies of the airborne sound transmission of mass timber assemblies, together with an explanation of the calculation procedures to predict the apparent sound transmission class (ASTC) rating between adjacent spaces in a building constructed of mass timber assemblies. The experimental data which is the foundation for this Report includes the laboratory measured sound transmission loss of wall and floor assemblies constructed of Cross Laminated Timber (CLT), Nail-Laminated Timber (NLT) and Dowel-Laminated Timber (DLT), and the laboratory measured vibration reduction index between assemblies of junctions between CLT assemblies. The presentation of the measured data is combined with the presentation of the appropriate calculation procedures to determine the ASTC rating in buildings comprised of such assemblies along with numerous worked examples. Several types of CLT constructions are commercially available in Canada, but this study focused on CLT assemblies with an adhesive applied between the faces of the timber elements in adjacent layers, but no adhesive bonding between the adjacent timber elements within a given layer. These CLT assemblies could be called “Face-Laminated CLT Assemblies” but are simply referred to as CLT assemblies in this Report. Another form of CLT assemblies does have adhesive applied between the faces of the timber elements in adjacent layers as well as adhesive to bond the adjacent timber elements within a given layer. These assemblies are referred to as “Fully-Bonded CLT Assemblies” in this Report. Because fully-bonded CLT assemblies have different properties than face-laminated CLT assemblies, the sound transmission data and predictions in this Report do not apply to fully-bonded CLT assemblies.
Publication date
PublisherNational Research Council of Canada. Construction
Series
  • Research Report (National Research Council of Canada. Construction), no. RR-335 (8 January 2020).
Related publication
  • Mahn, Jeffrey, David Quirt, Christoph Hoeller, and Markus Mueller-Trapet. ‘Addendum to RR-335: Sound Transmission through Nail-Laminated Timber (NLT) Assemblies’. National Research Council of Canada. Construction, 1 March 2018. https://doi.org/10.4224/40000417.
Other version
  • Hoeller, Christoph, Jeffrey Mahn, David Quirt, Stefan Schoenwald, and Berndt Zeitler. ‘Apparent Sound Insulation in Cross-Laminated Timber Buildings’. National Research Council of Canada. Construction, 10 July 2017. https://doi.org/10.4224/23002009.
LanguageEnglish
Peer reviewedNo
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Record identifiere38fb723-6a4c-4a78-9e47-5a73c92c448f
Record created2020-01-08
Record modified2022-06-03
Date modified: