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An acoustic consultant can help ensure compliance in meeting requirements and obtaining necessary permits or approvals from regulatory authorities. Through years of data, it has become apparent floor toppings and underlayments have a much greater effect on the high-frequency IIC performance of a floor/ceiling system.
The wood I-joist (WIJ) assemblies were added to DCA3 in 2001 and were intended to promote the usage of engineered lumber by simplifying the associated design, specification, and permitting processes. It is relatively common for building owners to ask for their floor assemblies to be designed to exceed these code minimums.
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