6 SOUND Flashcards
SOUND CONCEPT AIM
- to bolster occupant health and well-being
through the identification and mitigation of acoustical comfort parameters that shape
occupant experiences in the built environment.
-to provide a
comprehensive and holistic approach
to addressing the concerns of acoustical comfort through research-based design considerations
that buildings can accommodate for the purposes of improving occupant health and well-being
Health issues of external noise
3+1
exterior noise from transportation or industrial sources: sleep disturbance, hypertension and the reduction of mental arithmetic skills
risk for myocardial infarction - night road traffic men/air traffic women
Health issues of internally generated noise +sources
5
Dissatisfaction
HVAC- hinder productivity, focus, memory retention and mental arithmetic
create stress and disrupt performance on more complex cognitive tasks (e.g., the memory of prose, mental arithmetic)
Lack of privacy
Inappropriate reverberation times and background noise levels in a space can impede speech intelligibility and cause strain
How many and which preconditions?
1 Sound Mapping
Incorporate strategic planning required to prevent issues of acoustic disturbance from various sources of noise.
P S01 Sound Mapping
2 parts
Part 1
Label Acoustic Zones
Part 2
Provide Acoustic Design Plan
P S01 Sound Mapping
Part 1
Label Acoustic Zones
TD
- An annotated document is submitted and made available to occupants showing labeled zones throughout the project floor plan or similar schematic document as follows:Loud zones: includes areas intended for loud equipment or activities (e.g., mechanical rooms, kitchens, fitness rooms, social spaces, recreational rooms, music rooms)Quiet zones: includes areas intended for concentration, wellness, rest, study and/or privacy (e.g., restorative spaces, lactation rooms, nap rooms).Mixed zones: includes areas intended for learning, collaboration and/or presentation (e.g., auditoriums, classrooms, breakout spaces).Circulation zones: includes occupiable areas not intended for regular occupancy (e.g., hallways, egress, atria, stairs, lobbies).
- If Loud zones directly border Quiet zones, projects provide a plan for reprogramming or mitigating sound transmission between Loud zones and Quiet zones.
P S01 Sound Mapping
Part 2
Provide Acoustic Design Plan
A plan developed by the project team and/or project owner
OR
A detailed report from a professional in acoustics (conditions/solutions/measure) that outlines acoustical solutions and a timeline for implementation with a focus on (5)
PN
managing acoustical comfort, background noise, speech privacy, reverberation time and/or impact noise within the project boundary.
A detailed report from a professional in acoustics that describes existing conditions,
recommended solutions and
measurement results with a focus on managing background noise, speech privacy, reverberation time and/or impact noise within the project boundary. These measurements are not required to adhere to the Performance Verification Guidebook requirements for on-site testing.
How many and which optimizations
5
Feature S02
Maximum Noise Levels
Feature S03
Sound Barriers
Feature S04
Reverberation Time
Feature S05
Sound Reducing Surfaces
Feature S06
Minimum Background Sound
How many and which Beta features
3
Feature S07 Optimization
β Impact Noise Management
Feature S08 Optimization
β Enhanced Audio Devices
Feature S09 Optimization
β Hearing Health Conservation
Feature S02 Maximum Noise Levels
Achieve desired ambient noise levels such that HVAC, exterior noise intrusion or other noise sources do not impact occupant health and well-being.
1 part
measurement & tresholds
PT
Part 1 Limit Background Noise Levels
Background noise levels are measured over a period of five minutes and average sound pressure levels do not exceed the following thresholds, as applicable:
Note: Tier-1 pts/3pts
Category 1 Areas for conferencing, learning or speaking Average SPL (Leq) dBA 40 (35) Max SPL (LMax) dBA 50 (45) dBC +20
Category 2 Enclosed areas for concentration Average SPL (Leq) dBA 45 (40) Max SPL (LMax) dBA 55 (50) dBC +20
Category 3
Open areas for concentration, areas with regularly used PA systems, and areas for dining
core: lobbies, hallways and corridors within non-leased spaces
Average SPL (Leq) dBA 50 (45)
Max SPL (LMax) dBA 60 (55)
dBC +20
Category 4 Areas with machinery and appliances used by occupants (e.g., baggage handling areas, security, commercial kitchens, labs where spoken lectures do not take place) Average SPL (Leq) dBA 55 (50) Max SPL (LMax) dBA 65 (60) dBC +20
Feature S02 Maximum Noise Levels
Part 1
Limit Background Noise Levels (Max: 3 points)
For Dwelling Units
PT
Average background noise levels in bedrooms, when measured over a 12-hour minimum time period (which must include the hours of 10 pm to 7 am), do not exceed 35 dBA (Leq).
dBA
Leq
Noise level is measured in decibels (dB). A-weighted sound levels) . Il livello sonoro
Equivalent Continuous Level.
Sound exposure over an elapsed period of time.
dbA vs dbC sound level meter
The dBA sound level meter applies to the mid-range frequencies as opposed to the dBC sound level meter that measures low and high frequencies/ decibels relative to the carrier
Sound pressure level (SPL)
is the pressure level of a sound, measured in decibels (dB)
acoustic pressure level
Feature S03 Optimization
Sound Barriers
Increase the level of sound isolation and speech privacy between enclosed spaces.
2 parts
Part 1
Design for Sound Isolation at Walls and Doors (1 point)
Part 2
Achieve Sound Isolation at Walls (2 points)
Feature S03 Sound Barriers
Part 1
Design for Sound Isolation at Walls and Doors (1 point)
Interior walls meet the following sound transmission class (STC) or weighted sound reduction (Rw) values.
Doors that connect two occupiable rooms and doors to mechanical equipment rooms have :
Interior Wall Type Minimum STC or Rw
Between Loud zones and other occupiable spaces. 60
Between areas for conferencing, learning or sleeping and other regularly occupied spaces. 55
Between adjacent Quiet zones. 50
Between rooms for concentration and other regularly occupied spaces. 45
Between Circulation zones and regularly occupied spaces. 40
: a non-hollow core, minimum STC/Rw of 30 and seals at the head, jamb and base.
Sound transmission class is..
is a rating of sound isolation of a building wall assembly. The higher the STC rating, the better sound isolation the wall
A Weighted Sound Reduction Index or Rw
is the rating used to measure the level of sound insulating abilities of walls, floors, windows and doors. It is expressed in decibels (dB), and is used for a partition or single component only. The higher the Rw figure, the better the sound isolation that is provided.
Feature S03 Sound Barriers
Part 2
Achieve Sound Isolation at Walls (2 points)
2 options
Option 1: Noise isolation class OR Option 2: Speech privacy
S03/ part 2 / 1 option
For walls that separate regularly occupied spaces
Noise Isolation Class (NIC) or Weighted Difference Level (Dw) for each wall type
(5 LESS THAN STC)
Interior Wall Type Minimum Noise Isolation Class NIC or Dw Weighted Difference Level
Between Loud zones and other occupiable spaces. 55
Between areas for conferencing, learning or sleep and other regularly occupied spaces. 50
Between adjacent Quiet zones. 45
Between rooms for concentration and other regularly occupied spaces. 40
Between Circulation zones and regularly occupied spaces. 35
Noise Isolation Class (NIC)
is a single number rating derived from the measured values of noise reduction. The rating provides an evaluation of the sound isolation between two enclosed spaces that are acoustically connected by one or more paths. The STC and NIC ratings are similar.
S03/ part 2 Option 2: Speech privacy
For walls that separate regularly occupied spaces the following requirements are met:
The sum of the measured Noise Isolation Class (NIC) or Weighted Difference Level (Dw) combined with the Noise Criteria Rating (NC) or A-weighted Sound Pressure Level (LAeq) within a room achieves the following minimum values, as applicable. If an interior wall meets multiple categories listed, use the highest value listed.
Source Room & Receiver Room
Minimum NIC + NC or Dw + LAeq
Enclosed Loud zones &
Any Open areas for concentration or Circulation zones
80
All other occupiable areas
85
Enclosed areas for conferencing, learning or sleep &
Any Open areas for concentration or Circulation zones
75
Enclosed Quiet zones
80
Enclosed areas for conferencing, learning or sleep
85
Enclosed Quiet zones &
Any Open areas for concentration or Circulation zones
70
Enclosed Quiet zones (except offices)
75
Enclosed offices or areas for conferencing, learning or sleep
80
Any other occupiable space &
Enclosed Quiet zones
75
The noise criteria (sic) (NC)
is a single numerical index commonly used to define design goals for the maximum allowable noise in a given space.
They primarily apply to the noise produced by a ventilation system, but they may be applied to other noise sources.
Feature S04 Optimization
Reverberation Time
1 part
2 options
Part 1
Achieve Reverberation Time Thresholds (2 points)
Reverberation time design or performance
td or pt
S04 Reverberation Time
For projects in which the 5 space types listed in the table cumulatively make up at least 10% of the occupiable project area, the following requirements are met:
Space Type Space Volume, v (cubic meters) Reverberation Time, t (seconds)
Areas for learning, lectures and conferencing
v < 280 m3
t ≤ 0.6
280 m3 ≤ v ≤ 570 m3
0.5 ≤ t ≤ 0.8
v > 570 m3
0.6 ≤ t ≤ 1.0
Areas with regularly used PA systems N/A t ≤ 1.5
Areas for dining N/A t ≤ 1.0
Areas for fitness
v < 280m3
0.7 ≤ t ≤ 0.8
280 m3 ≤ v ≤ 570 m3
0.8 ≤ t ≤ 1.1
v > 570 m3
1.0 ≤ t ≤ 1.8
Areas for music rehearsal
v < 280 m3
t ≤ 1.1
280 m3 ≤ v ≤ 570 m3
1.0 ≤ t ≤ 1.4
Feature S05 Sound Reducing Surfaces
Design spaces with sound reducing surfaces to minimize the buildup of speech or other unwanted sound.
one part
For projects in which the 3 space types listed in the table cumulatively make up at least 10% of the occupiable project area, the following requirements are met:
Part 1 Implement Sound Reducing Surfaces
except for Dwelling Units
Noise Reduction Coefficient (NRC)
Space Type Metric Minimum NRC/aw Tier 1 1 Point Tier 2 2 Points Open workspaces 0.75 for at least 75% of the available ceiling area 0.90 for all available ceiling area Partial height barriers with a minimum height of 1.2 m above the finished floor and a minimum NRC/aw value of 0.70 between all opposing workstations Areas for conferencing and learning Minimum NRC/aw at ceilings 0.75 for at least 50% of the available ceiling area 0.90 for all available ceiling area Minimum NRC/aw at walls 0. 75 on at least 25% of two walls 0. 80 on at least 25% of two perpendicular walls Areas for dining Minimum NRC/aw at ceilings 0.75 on at least 50% of available ceiling area 0.90 for all available ceiling area
Feature S06 Minimum Background Sound
Increase acoustical privacy within and between occupied spaces.
2 parts
Part 1
Provide Minimum Background Sound (1 point)
Part 2
Provide Enhanced Speech Reduction (1 point)
Feature S06 Minimum Background Sound
Part 1
Provide Minimum Background Sound (1 point)
For Office Spaces
A sound masking system
is installed in open areas with Quiet zones, Circulation zones and enclosed rooms labelled as Quiet zones and
produces a 1/3 octave band adjustable output signal and
frequency spectrum of 100 Hz to 5 kHz.
The sound masking system is commissioned such that the following sound pressure levels are not exceeded:
Open areas with Quiet zones and/or Circulation zones: 48 dBA.
Enclosed rooms labelled as Quiet zones: 42 dBA.
The sound masking system is verified by a professional sound masking system installer in accordance with ASTM 1573-18 or equivalent standard.
Part 2
Provide Enhanced Speech Reduction (1 point)
For All Spaces
The project achieves the following features and parts:
Achieve two points in either Feature S03 Part 2 - Achieve Sound Isolation at Walls or
Feature S05 Part 1 – Implement Sound Reducing Surfaces.
Feature S06 Part 1 – Provide Minimum Background Sound.
ASTM 1573-18
American Society for Testing and Materials E1573-18 Standard Test Method for Measurement and Reporting of Masking Sound Levels
This test method specifies the procedure used to measure the masking sound in terms of A-weighted and one-third-octave-band sound
