18 Questions
What is the primary reason why the sound-reducing property of the air space is negated in lightweight walls?
The direct structural connection between the two wall surfaces
What is the potential benefit of using light-gauge steel studs at 24 inches in the center instead of wood studs at 16 inches in the center?
Less sound energy transmission
What is the estimated STC rating of a wood-framed wall with 3%inch-thick fiberglass acoustical insulation and 2-inch gypsum board on both sides?
STC 39
What is the purpose of using resilient channels in wood-framed assemblies?
To isolate the materials and raise the STC rating
What is the estimated STC rating of a steel stud-framed wall with 3%inch-thick fiberglass acoustical insulation and 2-inch gypsum board on both sides?
STC 48
Where are resilient channels typically installed in wood-framed assemblies?
Across the face of the studs
What is the STC rating of a wood-framed wall with a 6-inch gypsum board on resilient channels spaced at 24 inches vertically?
STC 48
What is the effect of adding layers of gypsum board on one or both sides of a wall?
It provides some increased mass, which can reflect more sound and decrease the amplitude of vibration
What is the effect of using two layers of 5-inch gypsum board on wood-framed walls with insulation?
The STC rating increases to 55
What is the effect of using inch gypsum board instead of -inch gypsum board?
The STC rating increases by 2-4
What is the effect of increasing the density of insulation while maintaining a constant thickness?
The STC rating stays the same
What is the incorrect assumption about acoustic insulation?
Higher-density insulation provides better sound transmission loss
What is the most critical property in a wall cavity for optimal wall performance?
Complete filling of the cavity between wall surfaces
What is the primary purpose of using an acoustical sealant in wall construction?
To fill gaps and prevent sound transmission
What is a common characteristic of acoustical sealants?
They retain their acoustic properties over time
What is a technique used to attenuate airborne sound in ceilings and floors?
Adding sound absorptive insulation and resilient channels
What is a common pathway for sound transmission in walls?
Through electrical outlets and other wall penetrations
What is similar between wall construction and floor/ceiling joist construction techniques?
The techniques and performance
Learn how to increase sound transmission loss and improve STC ratings in lightweight walls. Discover strategies to reduce sound transmission, including the use of light-gauge steel studs and optimized stud spacing.
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