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.
Wall type (b) has higher TL because the vibration of air particles within stud spaces is retarded by friction between air particles and glass fibers. This leads to the loss of sound energy; hence a greater TL for the assembly.
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