The ASTC ratings of high-rise constructions using CertainTeed SilentFX® QuickCut gypsum board

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TypeTechnical Report
Physical description65 p.
SubjectASTC; high rise; steel stud; SilentFX QC; CertainTeed; NBCC
AbstractThe 2015 edition of the National Building Code of Canada (NBCC) includes significant changes to the acoustic requirements for residential constructions. The 2015 edition of the NBCC changes the acoustic requirements for residential constructions from requirements based on a Sound Transmission Class (STC) rating to requirements based on an Apparent Sound Transmission Class (ASTC) rating. The ASTC rating includes contributions from both the direct transmission through the common building element and flanking transmission through the attached junctions and elements. The ASTC rating is therefore a better metric than the STC rating for describing the sound insulation of a building construction. The 2015 NBCC requires an ASTC rating ≥ 47 for constructions between dwelling units. The ASTC rating that a building constitution will achieve depends on the design of the building elements including the gypsum board, the framing and the thermal insulation as well as the design of the junctions between the building elements. Changes to the building elements or the junctions will change the ASTC rating. This report includes twenty-two examples of the calculation of the ASTC rating for lightweight (25 gauge) steel stud walls typically used high-rise constructions in conjunction with concrete floors and ceilings. The steel stud walls use combinations of 15.9 mm (5/8”) SilentFX® QuickCut gypsum board and 15.9 mm CertainTeed Type X gypsum board directly fixed to the steel studs. The façade walls include lightweight walls and concrete masonry walls. All of the constructions shown in the examples achieved an ASTC rating of 47 or greater.
Publication date
PublisherNational Research Council Canada. Construction
AffiliationConstruction; National Research Council Canada
Peer reviewedNo
NPARC number23002223
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Record identifierf308069f-1b20-4aac-bc6d-e7b174ff21bb
Record created2017-09-07
Record modified2017-09-12
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