Abstract
A collaborative government-industry research programme was carried out at the National Research Council Canada to develop new sound-transmission classes and fire-resistance ratings for wood-frame floor assemblies protected by gypsum-board ceilings. Forintek Canada Corp., the Canadian Wood Council, and five manufacturers of wood I-joists participated in the programme on behalf of the wood industry. Fire-resistance ratings developed through the research programme range from 30 min to 1 h: sound-transmission classes range from 20 to 65. Many of the ratings will be published in the next edition of the National Building Code of Canada. This paper highlights some of those sound-transmission class and fire-resistance ratings and describes how they mere derived from data obtained through the research programme.
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