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Last modified: August 30, 2019

Magnesiacore Soundproofing Drywall

Whether you are looking for a quieter living room, bedroom, garage or building a home theater; magnesiacore brings you an easy and inexpensive solution. Isolate, remove echo and reverberations and hear sounds undistorted with a system that’s fast to put together and more DIY friendly than other options.

For existing rooms, apply a layer of magnesiacore (any thickness) with acoustical goo over existing walls, ceilings and floors for remarkable acoustical improvement. Sinmple soundproof sheetrock solutions for the DIY and professional sound consultant or acoustical trade contractor we offer improved materials and innovations for better quietness in today's more noisy environments.

Acoustical Goo is a sound Isolating Dampening Compound of the class of materials known as viscoelastic. Acoustical goo does not harden but remains gooey between two layers of material to dampen sound by consuming the energy in the sound waves as it travels between layers of magnesiacore. The dampening material and two magnesiacore sheets function together like a shock absorber to amortize the sound traveling through them.

How does it work?

Constrained layer damping, sometimes referred to as CLD, a dampening material sandwiched between two stiff materials are  sheared rigid. With Acoustical Goo sandwiched between two layers of magnesiacore dampening occurs when the viscoelastic center is sheared. When bent, shear forces pull and stretch the dampening material. The unique polymeric construction of Acoustical Goo efficiently converts the mechanical energy to heat. The vibration energy is not only isolated, it is dissipated and transformed and thus removed.

Magnesiacore with much higher density and elasticity is superior to other sheetrock or drywall construction boards to work with Acoustical Goo to provide the best combination for isolated mass dampening. Acoustical Goo is formulated specifically to neutralize sounds traveling in building walls, floors and ceilings.

As refractory material magnesia molecules respond to energy of sound waves much like other radiation by refraction to enhance Acoustical Goo ability to dampen and neutralize the energy of the sound waves as they travel.

Attractive flooring applications that create sound management in office, commercial and residential environments by the "Isolated Mass Dampening of Sound Waves" thus consuming acoustical energy rather than reflecting it.

flooring flooring flooring flooring flooring

Video shows how to make simple acoustical panels on  existing wall with 9mm magnesiacore over Acoustical Goo.

Based on independent laboratory testing for acoustical material, 9mm (3/8") magnesiacore is superior to 16mm (5/8") gypsum board in an equal acoustical design.

However, in additions to magnesiacore being also very suitable for floors and even exteriors (which gypsum board is not good for), magnesiacore provides better acoustical performance by refracting sound energy waves. Plus unique designs are made possible such as stapled magnesiacore to magnesiacore avoiding short circuits from screwing face sheets to framing work that permits sound to travel through structures.


Details for Walls, Ceilings and Floor Construction:

Acoustic Goo Diagram

Recommended Acoustical Goo coverage is from 1 to 3 tubes per 4' x 8' panel (122cm x244cm) in uniform random layout (see figures below for methods)

Green Glue PatternUniform random coverage of Acoustical Goo gives optimum performance across all sound frequencies

Applying Green Glue for improved low frequency performanceLeaving patches uncovered using the same amount of Acoustical Goo results in thicker film when two sheets are together. This slightly improves low frequency behavior at the slight expense to higher frequency performance

Installation method to go Charting difference from to this

NOTE - Acoustical Goo takes approximately 30 days to set and reach optimum consistency to neutralize sounds waves. Although sound dampening occurs immediately by the system it will increase dramatically over time reaching its maximum dampening performance when fully set.

A key feature of the above wall / floor assembly is the reduction in number of screws and fasteners between the face wall panel (that air born sound hit) and the structure (studs). Reducing the number of fasteners to no more than one every 16" (40cm) apart reduces the number of "short circuits" that sound can take after hitting the face wallboard. This method permits Acoustic Goo to function better between two sheets since magnesiacore is stapled together separately from the studs.


Acoustical Assembly Test per ASTM E90

                    (5/8") ~16mm paperfaced gypsum drywall
STC 43 [16mm gypsum board] + [metal stud & batts] + [16mm gypsum board]

                    (~3/8") 9mm solid magnesiacore
STC 48  [9mm] + [metal stud & batts] + [9mm]
STC 50  [9mm / goo / 9mm] + [wood stud & batts] + [16mm gypsum board]
STC 55  [9mm / goo / 9mm] + [wood stud & batts] + [9mm / goo / 9mm]
STC 55  [9mm / goo / 9mm] + [metal stud & batts] + [9mm] =
STC 60  [9mm / goo / 9mm] + [metal stud & batts] + [9mm / goo / 9mm] =

Notes * STC 50 is typical code requirement for hotels, motels, apartments, condominiums, monasteries and convents blocking approx. 50 dB... loud speech cannot be understood. STC 60 is typically specified for highly sensitive areas blocking around 60 dB off sound volumes... loud speech cannot be heard. It is estimated that 12mm (1/2") of magnesiacore applied to both sides of metal studs and batts will provide more than STC 50 to satisfy code.

STC 60 acoustical test results ASTM E90 STC 55 acoustical test results ASTM E90 STC55 ASTM E90 acoutical test results wood studs ASTM E90 STC 50 acoustical test wood framing ASTM E90 STC 48 acoustical test results

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