1. Comfort
  2. Exterior noise intrusion

Exterior noise intrusion

Features/Comfort/Feature 74

Exterior noise intrusion

Intent: 

To reduce acoustic disruptions by limiting external noise intrusion.

BACKGROUND

Particularly in urban areas, loud or repetitive exterior noises can be a source of stress and a risk factor for certain health outcomes. Studies show that individuals exposed to traffic noise have a higher risk for diabetes, stroke and heart attack, and those exposed to road traffic and aircraft noises have a higher risk for hypertension. In addition, exposure to noise can lead to reduced reaction time and increased levels of annoyance. Preventing excessive exterior noise from reaching building interiors can help improve occupant comfort and well-being.

Part 1
Sound Pressure Level

Each regularly occupied space meets the following sound pressure level as measured when the space and adjacent spaces are unoccupied, but within 1 hour of normal business hours:
a.
Average sound pressure level from outside noise intrusion does not exceed 50 dBA.

Part 2
Sound Pressure Level in Residences

Each regularly occupied space meets the following sound pressure level when the space and adjacent spaces are unoccupied:
a.131
Average sound pressure level from outside noise intrusion does not exceed 40 dBA.

Part 3
Acoustical Narrative

The project team provides a narrative describing:
a.
The sources of external and internal noise considered in design.
b.
The strategies undertaken to manage these sources.

Part 4
Sound Pressure Level in Schools

Each regularly occupied space meets the following sound pressure level when the space and adjacent spaces are unoccupied:
a.133
Spaces equal to or less than 1,900 m² [20,000 ft²]: average sound pressure level from outside noise intrusion is less than or equal to 35 dBA.
b.133
Spaces greater than 1,900 m² [20,000 ft²]: average sound pressure level from outside noise intrusion is less than or equal to 40 dBA.