Category Studio Construction

Four Aspects of Sound Isolation

Four Aspects of Sound Isolation

When it comes to sound isolation for your recording studio environment, you only need to keep four things in mind.
Mass: The first line of defense in soundproofing
Decoupling: Break the connections that sound vibrations use to get from one side of a wall to the other.
Distance: Gain better overall sound reduction and increased low frequency isolation.
Absorption: Control mid to high frequency and also damp the individual wall panels.

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Vapor Barrier placement.


Where does the vapor barrier go on an exterior framed wall assembly?

When you frame wall assemblies in a basement, and this assumes the basement is more underground than not, you install a vapor barrier on the interior side of the framed wall assembly.

Not that it (the vapor barrier) would go anywhere else in a cold region but it could be a case that you would not need one, but that would be determined by the actual wall assemblies that exist, the materials they are made of, and how cold exactly is the climate you live in and for how many days a year it remains cold at what temperature.

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Floor Isolation


Floor Isolation

STC/IIC Sound Test Data, Concrete Structural Deck
Airborne Sound Transmission Loss, Impact Sound Transmission and Special Impact Tests Measurements Performed on One(1) Floor Assembly:

for Kinetics Noise Control

Investigation of the sound isolation of concrete slab floors
“The talks studios in the basement of Broadcasting House Extension were mounted on rubber pads as a protection against noise and vibration from the Bakerloo line which passes very close to the building. The isolation achieved, however, was less than the calculated figures and, although a margin of safety was allowed, the noise level in one studio proved to be higher than the maximum acceptable.”

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Sheetrock transmission Loss

Sheetrock transmission loss in wall assemblies

Sheetrock transmission loss data IR 761
“Results of sound transmission measurements to show ability to reproduce the same results after a complete specimen rebuild. The upper curves are data for the nominal STC 57 wall while the lower curves are for the nominal STC 46 wall.”

Noise Isolation Provided by Gypsum Board Partitions
With the exception of partitions built with single wood studs without resilient furrings, there is an approximate 5 point STC rating increase each time the gypsum boards are doubled on either side of the partition. At low frequencies, the transmission loss is increased by about 5 dB for every doubling of the gypsum boards on one side of the partition.

USG The Gypsum Construction Handbook
“Outlines methods for matching systems to specific performance criteria. Covers fire and sound criteria, wood and steel partitions and sound control systems. Specialty systems include area separation walls, cavity shaft walls, fireproofing, curtain wall/fire containment systems, thermal insulation, air water and vapor control.”

Soffit Mounted Monitors

Speakers mounted in soffits or in the wall

SOFFIT MOUNTED MONITORS
“Speakers have two theoretically ideal working conditions. The first is if its radiation space is into a full space (spherical radiation) or into a half space (hemi-spherical radiation). To achieve ideal full space conditions the speaker needs to be small compared to the radiated wavelength. Because the speaker front baffle is small the higher the frequency the smaller the radiation angle will be.”

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Basement moisture control

Basement moisture control starts when designing.

One of the main reasons a basement gets or stays wet is due to the walls being below ground level and subject to the moisture that the Earth contains, that’s one reason. Another is the fact that the Earth is cooler and if the temperature/dew point is elevated above the exterior wall then you have a classic example of “warm to the cold side” path when temperature seeks equilibrium. Still a third reason is the typical porous cinder blocks used in the construction that can retain water.

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Acoustical Separation floating floor


Floating floor over concrete

Floating walls and ceiling?
“If you excite the floor with sound, wouldn’t there be flanking towards other parts of the building? Normally you would float the floor and build the walls and ceiling on the floating floor to get total decoupling”


Is a Floating Floor Right For You? Answer: Probably NOT
“One of the most common assumptions people make about studio designs is that a floating floor is necessary to achieve the necessary amount of isolation (a.k.a soundproofing). “

Kinetics: STC/IIC Test Data: Floor and Ceiling Products
“Kinetics Sound Test Data for Architectural Products Sound Transmission Class (STC) and Impact Insulation Class (IIC)”

Floating floor over basement concrete
“One thing few cover on floating floors – rubber is a spring. Springs ONLY act like springs when they are NOT at the ends of their travel. When they ARE at the ends of their travel, they are NOT resilient at all, and could just as easily be THROWN AWAY. “

Glenns Isolated Drum Riser: Exploded View
“This drum isolation riser is intended to decouple a drum kit from the floor of the studio. It is designed with enough mass to be stable but floats on a layer of rigid insulation or other types of isolation pads.”

Floor Stc Values

STC- Sound Transmission Class: floor stc values

QTrbm – resilient base mat
“QTrbm is a dimpled, resilient base mat that can be applied under gypsum or full weight concrete to produce some of the thinnest sound rated systems in the industry.”

Kinetics Noise Control: Model RIM for Wood Floating
“Kinetics Noise Control’s premier rollout system easily creates an airspace of 1 to 4 inches and incorporates a high-performance resilient decoupler.”

Sound Transmission Class (STC) ratings for concrete and masonry walls
“Q: What are the Sound Transmission Class (STC) ratings for concrete and masonry walls? “

BSI-003: Concrete Floor Problems
“Moisture is involved in most building problems. The most serious tend to be structural damage due to wood decay, unhealthy fungal growth, corrosion, freeze-thaw, and damage to moisture sensitive interior finishes. Avoiding these problems requires an understanding of moisture, the nature of materials, and how it interacts with materials”

STC of Isolation Assemblies


STC of simple wall assemblies, isolation and sound proofing

Calculation of STC, MTC, OITC and Rw explained
“Note: This document is an extension/adaptation of a document explaining STC and OITC It is expanded (+ additional adjustments and more in-depth comments) with the MTC and RW single number rating.”

Acoustic Shaping
“In the preceding sections we showed that significant forces could be generated in unsteady fields, especially standing wave fields, due to interaction between the field and solid (or liquid) particles.”

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