Question 1

What is a resilient channel made of and what is its purpose?

Accepted Answer

The answer of What is a resilient channel made of...

Question 2

What is the speed of sound in air?

Accepted Answer

The answer of What is the speed of sound in...

Question 3

The International Building Code requires minimum STC 50 for a party wall between two dwelling units (condominiums or apartments). In terms of the transmission of speech or music through the wall, what will STC 50 provide?

Accepted Answer

The answer of The International Building Code requires minimum STC...

Question 4

In architectural acoustics, we distinguish between airborne sound and structure- borne sound. Place the followin sounds in one of the above two categories.
Sound from the speaker in an auditorium 
Sound from hailstorm on an auditorium roof
Sound from the footsteps of a person walking on the floor
 Sound from someone knocking on an entry door of a house Sound from the orchestra in a concert hall

Accepted Answer

The answer of In architectural acoustics, we distinguish between airborne...

Question 5

Is STC related to airborne sound or structure- borne sound?

Accepted Answer

The answer of Is STC related to airborne sound or...

Question 6

The International Building Code requires minimum STC 50 for a party wall separating two dwelling units (condominiums or apartments). With this STC value, loud speech is heard across the party wall with some effort and music is heard easily. As a consulting acoustician, what STC value would you recommend to the architect/project owner for the party walls in an upscale condominium project?

Accepted Answer

The answer of The International Building Code requires minimum STC...

Question 7

What is the typical center- to- center spacing of resilient channels?

Accepted Answer

The answer of What is the typical center- to- center...

Question 8

The addition of a resilient floor covering, such as vinyl tiles, improves the structures- borne sound insulation of a wood joist floor. Will the vinyl tiles also improve the airborne sound insulation of a floor?

Accepted Answer

The answer of The addition of a resilient floor covering,...

Question 9

Does the sound absorption coefficient of a material, a, vary with frequency? What is the unit of measurement of
a? What are the theoretical minimum and maximum values of a?

Accepted Answer

The answer of Does the sound absorption coefficient of a...

Question 10

Which wall assembly will provide a higher sound transmission loss (TL):
(a)6- 1/2- in.- thick concrete wall or (b)a 6- 1/2- in.- thick stud wall comprising 1- 1/2 in. × 5- 1/2 in. wood studs covered on each side with 1/2- in.- thick gypsum board? Give reason(s)for your answer.

Accepted Answer

The answer of Which wall assembly will provide a higher...

Question 11

What is the minimum building code- required STC value for a party wall separating two dwelling units (condominiums or apartments)?

Accepted Answer

The answer of What is the minimum building code- required...

Question 12

Explain what sound transmission class (STC)is.

Accepted Answer

The answer of Explain what sound transmission class (STC)is....

Question 13

What is impact insulation class, IIC? What is its unit of measurement?

Accepted Answer

The answer of What is impact insulation class, IIC? What...

Question 14

What is noise reduction coefficient, NRC? What is the unit of measurement of NRC? What are the theoretical minimum and maximum values NRC?

Accepted Answer

The answer of What is noise reduction coefficient, NRC? What...

Question 15

Does the transmission loss (TL)of an assembly vary with sound frequency?

Accepted Answer

The answer of Does the transmission loss (TL)of an assembly...

Question 16

STC represents the equivalent of average transmission loss (TL)of an assembly. The unit of measurement of TL is decibel (dB). Is the unit of measurement of STC also dB or different?

Accepted Answer

The answer of STC represents the equivalent of average transmission...

Question 17

What is the approximate range of frequencies (h)in human speech and their corresponding wavelengths? For all practical purposes, the speed of sound in air may be assumed = 1,000 ft/s in place of its exact value of 1130 ft/s.

Accepted Answer

The answer of What is the approximate range of frequencies...

Question 18

The ear's perception of the loudness of sound, commonly called sound level, is measured by the decibel (dB)scale. What is the approximate sound level in conversational speech at 1 m away from a speaker? Sound level in shouting speech at 1m from a speaker? Sound level that causes pain in the ear?

Accepted Answer

The answer of The ear's perception of the loudness of...

Question 19

Explain what transmission loss (TL)is. What is its unit of measurement?

Accepted Answer

The answer of Explain what transmission loss (TL)is. What is...

Question 20

Which wall assembly will provide a higher sound transmission loss (TL):
(a)a 6- 1/2- in.- thick stud wall comprising 1- 1/2 in. × 5- 1/2 in. wood studs covered on each side with 1/2- in.- thick gypsum board or
(b)same as wall type (a)but the air space between studs is filled with fiberglass? Give reason(s)for your answer.

Accepted Answer