General rules of thumb for controlling noise between
Changes in STC/Changes in Apparent
- A wall must extend to the structural deck in order
to achieve optimal isolation. Walls extending only to a dropped ceiling will result
in inadequate isolation.
- Sound will travel through the weakest structural
elements, which, many times, are doors, windows or electrical outlets.
the mass of a barrier is doubled, the isolation quality (or STC rating) increases
by approximately 5 dB, which is clearly noticeable.
- Installing insulation
within a wall or floor/ceiling cavity will improve the STC rating by about 4-6
dB, which is clearly noticeable.
- Often times, specialty insulations
do not perform any better than standard batt insulation.
- Metal studs
perform better than wood studs. Staggering the studs or using dual studs can provide
a substantial increase in isolation.
- Increasing air space in a wall
or window assembly will improve isolation.
in STC Rating||Changes in Apparent Loudness|
Twice (or half) as
Weaknesses - What You Should Know
difference between STC and NRC
STC Ratings for Various Wall Assemblies
STC Ratings for Masonry Walls
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