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Category Archives: 09 00 00 Finishes

Improving Floor/Ceiling Sound Control in Multifamily Projects: Sound Testing Practices

The sound transmission class (STC) and impact insulation class (IIC) are ASTM-derived single number ratings that try to quantify how much sound a stopped by partition being tested. Laboratory testing involves an ideal setting for the floor/ceiling assembly—it is isolated from the walls, and there are no penetrations for HVAC, plumbing lines, sprinklers, can lights, or electrical boxes. In the field (i.e. F-STC and F-IIC), the floor/ceiling assembly often sits on load-bearing walls, is connected to the structure, and contains many ceiling and floor penetrations for the items just mentioned. Consequently, the code allows for a lower rating for field scores over those in the lab.

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Improving Floor/Ceiling Sound Control in Multifamily Projects

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Demand for better floor/ceiling acoustics in multifamily construction has been spurred by consumer desires, new guidelines from code bodies, and stricter enforcement of existing codes. This article reviews important new guidelines, delving into how construction manufacturers have created new products or enhanced existing ones in the pursuit of achieving higher acoustical performance.

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Shapes and Sounds: Designing concert halls with curves

Images courtesy Radius Track Corporation

Using curved surfaces in performing arts facilities can diffuse sound and create distinctive appearances; the wide variety of options—may made available through use of modeling technologies and cold-formed steel (CFS)—means a wide palette of dramatically different visual results.

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Designing for Comfort & IAQ: Air distribution per ASHRAE 55 and 62.1

Photo © BigStockPhoto/Pavel Losevsky

The goal of a room air distribution system is to provide thermal comfort and a healthy living environment for occupants in the space. This article looks at designing such assemblies for comfort and indoor air quality (IAQ) per ASHRAE 55 and 62.1. It examines the common method of overhead distribution, but focuses on partially mixed (i.e. most under floor air distribution [UFAD]) and fully stratified (i.e. displacement ventilation) systems.

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Passive Fire Protection and Interior Wall Assemblies

All images courtesy ClarkDietrich Building Systems

To ensure optimal fire protection, building codes require interior wall assemblies to be evaluated by industry standards to determine their fire performance. This article gives examples of fire-rated wall assemblies and passive firestop systems, describing the testing they must go through to achieve their fire ratings. It also covers best practices for the specification and installation of each.

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