Case Studies: Effect of Fasteners Bridging Resilient Channels on AIIC Performance in Wood-Framed Condominiums
This paper presents a case study of a wood-framed condominium project where the fasteners affixing ceiling drywall bridged resilient channels thus negating their function. There were no other construction defects.
Complaints were raised by occupants/owners at the time of the one year performance audit required by the Tarion Warranty Program in Ontario Canada.
“Mini impact tests” were done in all units, using average reverberation times to expedite measurement collection and post processing. Ceilings were cut open to count the number of bridging fasteners. A strong correlation was found between the percentage of resilient channel / floor joist intersections with bridging fasteners, and the AIIC scores. This allowed for clear identification of all defective ceilings, which were then taken down and reinstated, subsequently achieving AIIC scores consistent with the design intent.
A second case study is presented for a similar wood-framed condominium project, where a similar relationship between the percentage of resilient channel / floor joist intersections with errant fasters and the AIIC score was found.
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