Carpeted Wood Floor Ceiling Assembly with Acoustiblok

NGC Testing Services rates this floor configuration with an IIC (impact insulation class) of 67 dB, and an STC (sound transmission class) of 54. See report graphs below.home depot composite decking prices Note the high performance in blocking the lowest noise frequencies, otherwise difficult or impossible to control.

The tested assembly: 1 layer 44 Oz. 7/16" thick carpet, 1 layer 1/4" underlayment, 1 layer sound mat material .33" thick, 3/4" t & g plywood sub-floor, 1 layer 16 Oz. Acoustiblok, 2" x 10" wood joists spaced 16" o.c. with 1" x 4" wood cross bracing, 3- 1/2" fiberglass insulation, and 1 layer 5/8" type X drywall mounted with resilient channel.

Impact Insulation Class (IIC) is a single number rating used to compare the performance of floor/ceiling partitions in blocking impact noise, such as footsteps and dropped objects. The higher the IIC rating number, the better the performance. An IIC of 50 is usually considered the minimum for preventing noise complaints in residential building. IIC ratings are calculated by a method similar to STC ratings (see description of STC below).
The IIC of a particular floor assembly is derived using a standard tapping machine,wood plastic composite decking dubai as stipulated in ASTM method E492.3 This machine incorporates five steelfaced hammers that strike the test floor and generate noise in a room below. The noise levels are measured and used to calculate the impact insulation class (IIC), following ASTM method E989.

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