How many dB does mass-loaded vinyl reduce? | ASLONG Guide

How many dB does mass-loaded vinyl reduce?

Professionals in the sound insulation materials industry often ask, How many dB does mass-loaded vinyl reduce? Understanding this performance metric helps optimize soundproofing system designs, meet regulatory requirements, and ensure customer satisfaction. This article provides concise, fact-based insights into the dB reduction offered by mass-loaded vinyl, using authoritative data.

What is Mass-Loaded Vinyl (MLV)?

- Definition:

Mass-loaded vinyl (MLV) is a flexible, high-density material designed for sound attenuation.

- Composition:

Manufactured from PVC (polyvinyl chloride) combined with dense minerals.

- Applications:

Used in residential, commercial, and industrial sound insulation projects—ideal for walls, floors, and ceilings.

How Many Decibels (dB) Does Mass-Loaded Vinyl Reduce?

- Typical Reduction Range:

- MLV reduces airborne sound transmission by approximately 20 to 35 dB when properly installed, depending on thickness and setup (source: *Engineering ToolBox*; *STC ratings*).

- Sound Transmission Class (STC):

- 1/8 (2 lb/ft²) MLV typically provides an STC rating of 26–27 as a stand-alone product.

- When combined in a wall assembly, the overall system STC may exceed 40–55, based on design (source: *Acoustical Surfaces*, *National Research Council Canada*).

- Performance Factors:

- Actual dB reduction depends on:

- Thickness and weight (e.g., 1 lb/ft² vs. 2 lb/ft²).

- Single or multi-layer installation.

- Sound frequency: better performance at mid to high frequencies.

- Proper sealing of joints and edges.

- Integration with other materials (drywall, insulation).

Why Choose Mass-Loaded Vinyl?

- High Density for Effective Barrier:

Superior to lightweight foams or felts; density is key for airborne noise reduction.

- Versatility:

Easy to integrate in new builds or retrofits.

- Fire and Mold Resistance:

Most commercial-grade MLVs are Class A fire-rated and moisture-resistant.

- Flexible Installation:

Can be cut, shaped, and fitted around obstacles without compromising performance.

Industry Standards and Testing

- ASTM E90 & E413:

Tests for airborne sound transmission loss and STC ratings confirm performance claims.

- Certifications:

Look for products with third-party verified test data and up-to-date compliance documentation.

Practical Tips for Maximizing dB Reduction

- Seal All Gaps:

Flanking paths and air leaks can significantly reduce effectiveness.

- Decouple Layers:

Use resilient channels or double-stud construction for additional STC improvement.

- Pair with Absorptive Materials:

Use MLV alongside fiberglass or rock wool for best results in complex assemblies.

Common Use Cases

- Industrial Noise Control:

Machinery enclosures, generator rooms.

- Commercial Buildings:

Office partitions, theaters, conference centers.

- Residential Soundproofing:

Home studios, bedrooms, shared walls.

Authoritative Sources:

- *Engineering ToolBox* - Sound Transmission Class and dB Loss Data

- *Acoustical Surfaces Inc.* - MLV Product Testing Reports

- *Acoustical Society of America* - ASTM Standards

For the best performance and to meet project requirements, always consult ASLONG's technical specialists for MLV selection and system design guidance.