1 LB Mass Loaded Vinyl 4.5x20 (90 SF) - Flexible Soundproofing Roll

In this review the EnviroFlex 1 LB Mass Loaded Vinyl 4.5x20 (90 SF) is evaluated for homeowners, studio builders, and vehicle upfitters who need a straightforward way to reduce airborne noise. The bottom line: this roll delivers dense, flexible mass that noticeably cuts voices, traffic, and appliance noise when applied to walls, ceilings, floors, or vehicle panels. Installation is simple enough for a determined DIYer, and professionals will appreciate the 26 STC design intent and the non-toxic, odor-free vinyl construction.

Key Features

• High density 1 LB per ft: Provides mass to block airborne sound transmission effectively across common partitions and vehicle panels.
• 26 STC rating: Engineered for acoustic control to reduce voices, traffic, and appliance noise in residential and commercial spaces.
• Flexible and easy to cut: The roll bends around curves and corners and can be trimmed with a utility knife without special tools.
• Simple installation: Can be fastened with screws, adhesive, or nails to walls, ceilings, floors, and vehicle interiors for quick application.
• Non-toxic, odor-free material: Made from a recycled vinyl blend intended for long-term use without persistent smells or hazardous emissions.
• Versatile applications: Suitable for homes, studios, offices, cars, RVs, and light commercial environments where airborne noise reduction is needed.

Who It's For

This product is aimed at homeowners converting bedrooms or home offices, musicians and podcasters building or treating small studios, and vehicle owners wanting to reduce road and engine noise. The roll format and flexible material make it practical for installers who need to cover irregular surfaces or retrofit existing panels.

Those who should look elsewhere include buyers seeking full thermal insulation solutions or contractors needing a complete multi-layer sound isolation system; MLV adds mass but does not replace dedicated decoupling or absorption layers in high-end studio construction.

Pros & Cons

Pros

• High mass per ft reduces airborne sound effectively when added to common partitions.
• Flexible vinyl construction is easy to trim and conform to curves without tearing.
• Non-toxic, odor-free composition makes it suitable for indoor and vehicle use.
• Multiple fastening options let pros and DIYers choose screws, adhesive, or nails.

Cons

• MLV provides mass but does not address low-frequency structure-borne vibration without additional isolation methods.
• At 4.5 in by 20 ft per roll, larger projects require multiple rolls which adds seams that need careful overlap or sealing.

Specifications

Product type	Mass Loaded Vinyl soundproofing roll
Weight	1 LB per sq ft
Dimensions	4.5 ft x 20 ft (90 sq ft)
STC Rating	26 STC
Material	Recycled vinyl blend, non-toxic and odor-free
Installation	Cut with utility knife; fasten with screws, adhesive, or nails

Our Verdict

The EnviroFlex 1 LB MLV roll is a practical, cost-effective way to add blocking mass for airborne noise in homes, vehicles, and small studios. It is especially good value for projects that need a durable, odor-free layer that is easy to cut and install, though serious low-frequency isolation will still require complementary construction methods.

Frequently Asked Questions

Can this be used inside vehicles?
Yes. Its flexible vinyl construction is suitable for vehicle panels and can reduce road and engine noise when applied to doors, floors, or cargo areas.

Do you need special tools to install?
No. The roll can be cut with a utility knife and attached using screws, adhesive, or nails depending on the surface.

Is there an odor or hazardous emissions?
The material is described as non-toxic and odor-free, made from a recycled vinyl blend intended for indoor and vehicle use without persistent smells.