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15 Cards in this Set
- Front
- Back
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What can be done in an apartment building layout for noise protection? |
The layout of the most critical rooms (bedroom, living) are protected from adjoining apartments by a buffer zone of non critical areas. |
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What is the adequate sound transmission loss between adjacent apartment non-critical zones? |
45db |
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What is the adequate sound transmission loss between adjacent apartment quiet aka critical zones? |
50 db (is also typically used for floors) |
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What is the adequate sound transmission loss between a critical and non critical zone? |
none or much greater than 50 db |
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True or False: Floor transmission is the commonest and most disturbing noise problem in existing apartments |
True |
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What is the main sound transmission requirement for partitions between tenants in office buildings, and what is the average acceptable transmission loss? |
Speech privacy, 35-40 db |
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What is the transmission loss in typical current office partitions and ceiling panels? |
25 db |
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What can be done to prevent transmission loss over the partition above a suspended ceiling in an office building? |
Use ceiling panels backed by a heavy impervious layer that reduces sound OR Building adequate partitions in the space above the ceiling (whole problem may be simplified by restricting the location of major partitions to modular intervals ) |
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What rooms constitute the most critical noise problem in office buildings? |
Executive offices and conference rooms Note: noise produced by mechanical equipment & infrastructure can also be a problem. A suitable performance specification is required to ensure equipment is designed to meet noise criterion |
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What are the Noise Criteria (NC) for executive offices, small offices, general offices, large general offices and machine rooms? |
NC-30- Executive offices, conference rooms seating 50 people. NC-35- Small offices, semi-private offices, conference rooms seating 20 people. NC-40- General offices, in which speech and telephone communication are important. NC-45- Large general offices, drafting rooms. Normal communications at 3 to 6 ft. NC-55- Business machine rooms, communication in raised voice at 3 to 6 ft. |
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No general solution can be prescribed for factory noise since the intensity and character very. Apart from airborne noise there is often a vibration problem. How is a vibration problem usually solved? |
By providing special foundations or vibration-isolating mountings. |
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What are the principle considerations for industrial noise control in factory areas? |
Prevent hearing impairment among machine operators Facilitate necessary speech communication amount operators Prevent transmission of excessive noise into other parts of the building or into adjacent buildings. |
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Regardless of the assembly what is essential to the integrity of the the transmission loss of a wall/floor etc? |
it is essential that the wall be as air-tight as possible |
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What can be done for doors in wall where high sound insulation is required? |
Doors should be of solid wood and carefully fitted to minimize cracks |
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Plumbing fixtures are often troublesome noise produces. What can be done to mitigate problems with noisy plumbing fixtures and infrastructure? |
Quite fixtures Resiliently supported service pipes (not on critical walls) Doors from washrooms should not open directly into quiet areas and should be well fitted Ventilating louvers should have noise filters Layout - stack and group plumbing functions. |
