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Building: Design for Sound and Acoustics Part 4 – Overview of Soundproofing Materials
This is part 4 of a series of articles that will provide a solid understanding of the principles of sound and acoustics as they relate to the design and construction of public and private spaces. Part 1 covers the basics of sound, Part 2 covers decibels, Part 3 STC ratings and Part 5 room acoustics.
A basic understanding of sound insulation methods and types of materials is an integral component of proper planning and design of any room or public area. If you are concerned about improving the experience of residents, residents or visitors, learn about the use of the facility. Sound insulation plays an important role in the success of your project.
Quick Point #1
Soundproofing a room is an almost impossible task. It can be done, but the cost of most applications is prohibitive. Therefore, a more realistic goal is to minimize room-to-room noise transmission within a given budget.
The purpose of sound insulation is to block the flow of sound energy through the walls and structures of the room. Once inside the building structure, sound energy is carried from room to room, reducing the experience of residents, residents, and visitors to your facility. The two most effective forms are separation and density. There are many products and techniques used by soundproofing companies that manufacturers recommend. I’ll try to give you a basic idea of the types of materials and systems you can consider. Before choosing any product or method, it is important to analyze the purpose and use of the space to be soundproofed. What you want to avoid is choosing too much or too little product. Using the Goldie Locks method will give you the best solution. As with most products, the better the performance, the more investment you’ll make.
Although insulation and compaction are the most effective sound insulation methods, a hermetically sealed concrete bunker may not be a practical solution for your application. The density of concrete offers a solid level of sound insulation, but there are still problems with sound insulation such as ventilation, lighting, electricity, windows and entrance doors. A general rule to follow is where the airflow will sound.
Okay, so the concrete bunker idea isn’t for you? Consider several options for soundproofing. In the next section, I will examine four types of soundproofing materials and compare their soundproofing performance. To understand the sound insulation performance of these products, we need to understand the evaluation elements. We will use the Decibel(dB) and Sound Transmission Class (STC) ratings in Sections 2 and 3, so please take some time to review these articles.
Option #1 is a product called MassLoaded Vinyl (MLV) or Lame Mass Barrier.
Level 1 soundproofing material for sound insulation beyond standard drywall and fiberglass insulation.
MLV is a low-mass material used to block unwanted sound and reduce sound transmission without reducing space. Many soundproofing companies offer this or similar products under different names, but they are essentially the same product.
MLV products are typically installed on frame supports in front of drywall. It can also be installed between two layers of drywall to improve sound insulation performance. Generally, these products achieve an STC rating in the 26-27 zone. Performance degrades significantly in lower bass frequencies and will not perform well in low-frequency areas such as music rooms and performance halls. Some of the key features are listed below.
1) The most common MLV product is 1 pound per square foot.
2) Usually comes in 54″ wide rolls. It is flexible and available in various lengths.
3) Can be cut with a carpet knife.
4) Weight and flexibility make it difficult to handle.
5) Installation requires additional labor and generally requires a crew of 2 or more installers.
6) Due to the weight and nature of the product, it is especially difficult on the ceiling
Option #2 A product called industrial damp drywall. As the name suggests, it is a drywall-based product specifically manufactured as a sound insulation material. The official name is ceramic polymer gypsum composite drywall. During manufacturing, a layer of sound dampening product is sandwiched inside the drywall. As with standard drywall, the product comes in various thicknesses from ½” to 1 3/8″. Sound insulation performance will vary by product and installation method.
The main advantage of this product is the installation process. It is basically installed in the same way as standard drywall. This product is more expensive than standard drywall, but the ease of installation can offset the increased cost in labor savings.
In terms of performance, the product delivers as advertised. Depending on the product selected and installation method, it offers good to excellent performance in the low frequency range. It would be one of my top picks for large rooms based on its ease of installation. It doesn’t require a special installation crew, so there shouldn’t be any problems with installing a standard drywall installer. Some of the key features are listed below.
1) Sound insulation materials offer different levels of sound insulation (STC rating) and can be used on walls, ceilings and even floors.
2) Installed like traditional drywall.
3) It is more expensive than traditional drywall, but it has certain advantages in terms of installation over other soundproofing methods.
4) Heavier and slightly more difficult to cut than standard drywall. In general, this is one of the most difficult things to install in terms of technical labor.
5) Compared to other methods, it is a very effective method for sound insulation.
6) Test data is replicated by independent testing and product performance is well documented.
7) My experience with this product was good. It worked as advertised.
Option #3 is a so-called product visco-elastic sound-insulating compound (substance-like substance) sound-insulating materialIt is applied like a sealant between two layers of drywall. The product uses standard drywall but requires two layers of drywall. The first layer is installed according to the usual installation. On the inside of the second layer of drywall, an adhesive-elastic mixture is spread before installation. Then the second layer of drywall is placed on top of the first layer, with the opposite layers overlapping each other. The goal is to cover the layers of the first layer with the second drywall in a crosswise manner. This technique overlaps the layers and creates gaps inside the drywall, allowing sound to enter the building structure.
A big advantage of this product is that it can be used to create additional sound insulation without the need to reconstruct existing structures. Adding an additional layer of drywall over an existing layer of drywall can greatly improve the soundproofing performance of walls and/or ceilings. When used correctly, the material provides solid performance at lower frequencies. Some of the key features are listed below.
1) Sound insulation performance is offered, but you need to consider the cost of installing an additional layer of drywall. It requires application and installation control.
2) The compressive force between the two layers of drywall spreads the material apart.
3) The material will take several weeks to fully dry and achieve maximum results.
4) Cost per vial is approximately $15.00.
5) The recommended application rate is 2-3 tubes per 4×8 sheet of drywall.
6) Independent sound insulation test reports are available on the manufacturer’s website.
7) A good soundproofing option to balance budget and performance, but can be very messy to operate. The main thing is to use it correctly to get the desired result.
Option #4 is a process called separation. The basic idea is to remove the drywall connection to the frame. Accomplishing this objective can prevent sound energy from entering the structure of the structure, thereby eliminating or significantly reducing structural sound transmission. The process uses isolation mounting clips that are attached directly to the frame mounts. These clips are designed to block the transmission of sound energy. Then a metal strip, called a flexible or hat channel, is installed perpendicular to the wall and ceiling frame fasteners. Flexible ducts are metal strips that hold the drywall approximately ½” from the frame. They are usually installed 24″ on center, perpendicular to the studs. called a canal.
When installed correctly, this is a very effective sound insulation method. The key point is “properly installed”. Drywall is attached to flexible ducts, not frame fasteners. It is very important that the installers do not tighten the screws. If this occurs, the separation process may be compromised by allowing a path from the drywall into the frame infrastructure. Some of the key features are listed below.
1) Isolation is achieved without loss of space compared to double walls.
2) Offers good performance across the frequency range.
3) Works well as a low frequency sound insulator.
4) Separate the surface of the room from the structure.
5) Separate the surface of the room from the frame structure using insulation clamps, flexible channels (caps), isolation loops, and floating floor processing.
6) Clamps are directly attached to the frame.
7) Drywall is attached to a flexible channel, which prevents the transfer of mechanical energy (vibration) to the frame.
8) Without isolation clamps, flex ducts have had the problem of misplaced screws.
9) Screws entering the frame fasteners cause a short circuit of the system, reducing the effectiveness and sound insulation performance. As a result, you will spend a lot of money and effort, and it will not work to its full potential. Not good.
Sound insulation manufacturers have introduced insulation clamps into the system, greatly improving installation, eliminating the problem of misplaced screws and simplifying installation. My experience with this product was excellent. When properly installed, sound insulation is durable.
I hope this article has given you a better understanding of the various soundproofing methods. Please contact me if you have any questions or suggestions.
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