Indoor Environment

Specifying Acoustical Criteria for Buildings

This Update discusses the quantities that should be specified to ensure successful acoustics for complete rooms in buildings.

Successful building design depends as much on acoustical performance as it does on lighting and ventilation. Rooms where occupants cannot hear conversation because there is too much background noise or too much reverberation are failures. So too are rooms where occupants are distracted by intrusive sound from elsewhere. Full story

Individual Control over Office Lighting: Perceptions, Choices and Energy Savings

Employees say they want more control over their workplace environment, including lighting. What the benefits of greater control are — to workers, employers, and facilities managers — is a question the Lighting Quality research project conducted by NRC’s Institute for Research in Construction tried to answer. This Update reports on an experiment performed as part of this project. Full story

Sound Isolation and Fire Resistance of Assemblies with Fire Stops

This Update examines various fire-stopping techniques that meet the intent of the National Building Code of Canada (NBC) with respect to fire resistance and that do not adversely affect the sound isolation of the wall assembly. The information is derived from the results of an industry-sponsored consortium project led by the National Research Council’s Institute for Research in Construction (IRC).1 Full story