Green Glue versus QuietRock. Which is better?

Comparing Green Glue with QuietRock

Clients often ask me this question. They want to know an unbiased recommendation which soundproofing product they should use for maximum noise reduction and soundproofing effectiveness. Is it Green Glue, QuietRock or SilentFX? To find out my answer, read on.

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Comparing Green Glue, QuietRock and SilentFX acoustical test data

The test data referenced below is provided by manufacturers, Green Glue Company and PABCO Gypsum, the manufacturer of QuietRock and CertainTeed, the manufacturer of SilentFX. They both provide test reports commissioned from reputable third party acoustical test laboratories. The table below compares STC (Sound Transmission Class) values for four pairs of comparable assemblies. Note that I consider two layers of drywall with Green Glue between layers comparable to one layer of QuietRock or SilentFX.

Green Glue Assembly

STC

​Ref

QuietRock or SilentFX Assembly

​STC

Ref

Steel, Green Glue on one side only:


5/8" Drywall


Green Glue Compound


5/8" Drywall


Steel 3-5/8" Studs // 24" o/c


R13 Fiberglass


5/8" Drywall

56

[1]

Steel, QuietRock or SilentFX on one side only:


5/8” QuietRock ES


Steel 3-5/8" Studs // 24"


R13 Fiberglass


5/8" Drywall

55

[2]
[9]

Steel studs, GG on both sides:

5/8" Drywall


Green Glue Compound


5/8" Drywall


Steel 3-5/8" Studs // 24" o/c


R13 Fiberglass


5/8" Drywall


Green Glue Compound


5/8" Drywall

61

[3]

Steel studs, QR on both sides:

5/8” QuietRock ES


Steel 3-5/8" Studs // 24" o/c


R13 Fiberglass


5/8” QuietRock ES

57

[4]

Wood, staggered studs:

5/8" Drywall


Green Glue Compound


5/8" Drywall


Wood 2" x 4" Staggered Studs // 16" o/c


R13 Fiberglass


5/8" Drywall


Green Glue Compound


5/8" Drywall

62

[5]

Wood, staggered studs:

5/8" QuietRock ES


Wood 2" x 4" Staggered Studs // 16" o/c


R13 Fiberglass


5/8" Drywall


5/8" Drywall

60

[6]

Wood studs:

5/8" Drywall


Green Glue Compound


5/8" Drywall


Wood 2" x 4" Studs // 24" o/c


5/8" Drywall


Green Glue Compound


5/8" Drywall

56

[7]

Wood studs:

5/8” QuietRock ES


Wood 2" x 4" Studs // 24" o/c


5/8” QuietRock ES

54

[8]

Other differences between the two products

Green Glue Assemblies

Noise Reducing Board Assemblies

Test data is available with resilient channels and resilient clips on walls, showing improved noise attenuation with resilient mounting [9]

QuietRock is not recommended over resilient channels on walls [10], while SilentFX allows resilient channels [9].


Can be used with resilient channels on ceilings [11]

Can be used with resilient channels on ceilings [12]

​Has increased noise attenuation at low frequencies by 2-3 dB versus similar assemblies with the other product.[13].

Has reduced noise attenuation at low frequencies by 2-3 dB versus similar assemblies with the other product [13].

References for other differences:

[9] Resilient channels with GG

[10] Resilient channels with QR

[11] Ceilings with GG

[12] Ceilings with QR

[13] Information obtained by inspection of detailed attenuation data per frequency.

Conclusion

The acoustical test data for comparable assemblies shows small advantage of using Green Glue, particularly at low frequencies. However, for most test assemblies the advantage of Green Glue is small, within a measurement error. It is up to the individual contractor to make an installed cost analysis and chose the product that can be installed more economically.

There are many more assemblies available with test data for each product, but the assemblies are not directly comparable. I therefore recommend using the most suitable assembly with available test data that meets client’s objectives, whether it is with Green Glue,  QuietRock or SilentFX.

The manufacturers for SilentFX and QuiteRock provide tested assemblies that are different from the competitor's assemblies, making precise comparison difficult.  However, both products function on the same physical principle and are functionally identical.

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About the Author Ivan Koval

The author is the publisher of the Soundproofing.Expert website. He is a soundproofing and building acoustics consultant working in Toronto and GTA, Ontario, Canada. Telephone (416) 471-2130

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