The 7 Best Soundproofing Insulation Materials for Superior Acoustic Control

Creating a quieter, more comfortable environment in both residential and commercial buildings has become increasingly important.

And choosing the right soundproofing insulation is key to blocking unwanted noise and enhancing the overall acoustic quality of your space. 

To help you find an insulation that fits your needs, we’re discussing several of the best soundproofing insulation materials available at Rmax!

Factors In Choosing The Best Soundproofing Insulation

Selecting the best insulation for soundproofing involves understanding a few key attributes. For instance:

  • Sound Transmission Class (STC): This rating measures the material’s ability to block sound. A higher STC rating indicates better soundproofing performance.

  • Noise Reduction Coefficient (NRC): NRC measures how much sound a material can absorb, reducing echo and reverberation within a space.

  • R-Value: While primarily associated with thermal insulation, the R-Value also plays a role in soundproofing by adding mass to walls, floors, and ceilings, further inhibiting sound transmission.

The 7 Best Soundproofing Insulation Materials

Now that you have a clear understanding of what makes insulation effective for soundproofing, let's explore the best soundproofing insulation materials:

1. Mineral Wool Insulation

Mineral wool is known for its high NRC rating, often exceeding 1.0, which makes it one of the most effective materials for sound absorption.

It's fire-resistant and water-repellent properties contribute to its versatility in various construction applications, including walls, ceilings, and floors.

However, mineral wool has its drawbacks, particularly in moisture-heavy environments where it can absorb water.

  • Unlike mineral wool, polyiso insulation not only provides excellent soundproofing but also retains its thermal and acoustic properties in wet conditions, making it a more reliable choice for comprehensive building solutions.

2. Fiberglass Insulation

Fiberglass offers a strong balance between cost and soundproofing capability. With an NRC rating close to 1.0, it effectively absorbs sound across a range of frequencies. Fiberglass is lightweight and relatively easy to instal.

3. Spray Foam Insulation

Spray foam insulation is an excellent choice for filling gaps and cracks, ensuring a continuous barrier against sound. 

The expanding foam not only blocks noise but also provides superior thermal insulation. 

However, professional installation is recommended to ensure optimal coverage and performance.

4. Blown-In Cellulose Insulation

Made from recycled paper, blown-in cellulose is an eco-friendly option that provides effective soundproofing—particularly in residential settings.

It is especially effective in reducing noise in bedrooms and home offices. The dense, fibrous nature of cellulose helps absorb sound waves and adds an environmental benefit.

5. Mass Loaded Vinyl (MLV)

Mass Loaded Vinyl is a flexible, high-density material that excels at blocking sound transmission through walls, ceilings, and floors.

Its effectiveness is a result of its substantial mass, which inhibits the passage of sound waves. 

6. Acoustic Foam Panels

Acoustic foam panels, often used in recording studios, helps you manage sound reflections and reduce echo.

While they do not block sound as effectively as other materials, their ability to enhance sound quality within a room is unmatched. 

7. Rigid Foam Insulation Boards

Rmax offers a range of high-performance rigid foam insulation boards that not only provide excellent thermal insulation but also contribute to effective soundproofing. Below are the specific products:

DuraSheath®

DuraSheath® is a versatile polyiso insulation board designed for use across a variety of applications, including exterior walls and re-siding. 

It features a non-metallic, inorganic polymer-coated glass fiber mat facer that enhances both energy performance and durability. DuraSheath® is ideal for projects requiring robust thermal insulation while contributing to soundproofing, particularly in walls and ceilings.

EvoMaxci®

EvoMaxci® is a continuous insulation system that integrates seamlessly with the EVO™ Architectural Panel System. 

It utilizes ECOMAXci® FR Air Barrier that provides enhanced R-values and acts as a barrier against infiltration. The glass fiber reinforced aluminum facers on both sides of the board ensure durability and dimensional stability, which makes EvoMaxci® suitable for masonry or stud wall constructions where superior insulation and sound control are necessary.

Below-Grade Insulation Protection

Rmax Below-Grade insulation is engineered for below-grade exterior walls, offering energy-efficient thermal insulation coupled with protection against water absorption during backfill. 

The polyiso foam core—bonded to reinforced polymeric facers—creates a multi-layered defense that makes it an excellent choice for applications where both moisture resistance and soundproofing are needed.

TSX-8510

TSX-8510 is specifically designed for exposed interior applications, where it serves both as a thermal and sound insulation solution. 

The board consists of a closed-cell polyiso foam core with glass fiber reinforced aluminum facers, one side of which is coated with a white modified acrylic finish. 

TSX-8510 is ideal for use in pre-engineered metal buildings, tilt-up construction, and wood stud basements, where both insulation and soundproofing are required.

Rmax® Pro Select Polyiso Insulation Board

Rmax® Pro Select is a high-performance polyiso insulation board designed for both residential and commercial applications. 
It offers excellent thermal resistance, contributing to energy efficiency, while also providing moisture resistance due to its closed-cell structure. The board is lightweight, easy to install, and suitable for a variety of wall and roof assemblies, making it a great choice for projects that require reliable, long-term insulation solutions.

Why Rmax is the Best Choice for Soundproofing

Rmax insulation products stand out not only for their soundproofing capabilities but also for their comprehensive benefits in building construction.

By integrating high-performance polyiso insulation with excellent thermal properties, you ensure that your building is both quiet and energy-efficient. The company’s commitment to sustainability further enhances the appeal of their offerings, making Rmax a preferred choice for modern construction needs.

Discover Rmax’s Soundproofing Insulation Solutions

Partner with Rmax to achieve unparalleled acoustic and thermal performance in your next project. 

Our polyiso insulation products are designed to meet the highest standards of energy efficiency and sustainability while providing excellent soundproofing.

Contact us today for more information.