PDX_29_Acoustics 4 Flashcards
Limiting noise in the building:
Construct a cavity wall:
Two separate layers that are not rigidly connected, increasing width of airspace, placing sound absorbing material in the airspace will do so further.
Limiting noise in the building:
Doubling the mass of the wall will increase the TL by:
6 dB
Limiting noise in the building:
Stagger studs at 8 inches on center and mount sheet rock with:
Resilient clips
Limiting noise in the building:
Locate similar areas
Next to each other both horizontally and vertically
Limiting noise in the building:
Use closets and hallways to:
Buffer noise producing spaces.
Locate noise producing areas away from quieter areas.
Limiting noise in the building:
In long hallways, such as a hotel,
Stagger doors
Limiting noise in the building:
Avoid parallel walls with hard services in:
Small rooms.
The rooms acoustics are dependent on it shape, form, volume, and nature of services.
Parallel services, concave surfaces, convex services
Parallel services reflect sound back-and-forth.
Concave services focus sound and create hotspots.
Convex surface is diffuse sound and are desirable and listening areas
It clear echo is caused when reflected sound at sufficient intensity reaches a listener more than __ms after he has heard the direct sound
50 ms
Limits the amount of exposure to high decibel noises in the workplace
OSHA
Ex. 90 dB = 8 hrs exposure
100 dB = 30 min exposure
Gen. rules of thumb:
STC for walls, floor, ceilings
STC for entrance doors
STC 54 walls, floor, ceilings
STC 26 for entrance doors
Walls must extend to the ______ ____ in order to achieve optimal isolation.
Structural deck
Installing insulation with in a wall or floor/ceiling cavity will improve the STC rating by about ____,
4–6 dB, which is clearly noticeable
Acoustic performance of wood studs compared with metal studs
Metal are superior
