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ENVIROFLEX™ MASS LOADED VINYL

Soundproofing Applications for Mass Loaded Vinyl

Use added mass to reduce sound transmission through walls, floors, ceilings, vehicles, pipes, ducts, and mechanical enclosures.

Shop Mass Loaded Vinyl MLV Installation Guide STC Explained

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Walls & Shared Spaces

Add Mass Where Sound Is Passing Through.

Mass Loaded Vinyl is used as a flexible sound barrier in wall, floor, ceiling, vehicle, pipe, and mechanical assemblies. Choose the application below to see the recommended approach, material weight, and installation considerations.

Apartments, condos & shared walls

Stop Hearing Your Neighbor.Without Opening the Walls.

1LB MLV installs as a retrofit over existing drywall — no demolition, no stud access required. In a standard wall assembly with batt insulation, it brings the wall to STC 41, where loud speech becomes muffled and barely intelligible.

Apartments

1LB MLV (STC 26) — right for this application: STC 41 in standard wall assembly is the residential target. 2LB is rarely necessary for apartment shared walls — the additional mass and cost is hard to justify when 1LB achieves the required performance.

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Step #1

Calculate Coverage

Wall height × width for each wall. Add 15% waste. One roll of seam tape per 2–3 MLV rolls.

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Walls

Stop sound transmission through shared walls.

Add MLV to a wall assembly to increase mass and reduce airborne sound passing from room to room. It can be installed during construction or as part of a retrofit assembly.

Typical recommendation1 LB MLV is the standard starting point for most residential wall projects. Use 2 LB when maximum mass or lower-frequency control is the priority.

Shared wallsBedroomsHome officesApartments

Basic installation flow

Measure the wall

Calculate total square footage and add material for seams and trimming.

Cut MLV to fit

Cut sheets or rolls with a sharp utility knife on a safe work surface.

Fasten securely

Support the material and fasten it to the assembly according to the installation method.

Seal seams and penetrations

Keep joints tight and seal gaps around seams, outlets, and penetrations.

Complete the assembly

Install the final finish layer while preserving sealed joints and perimeter details.

Assemblies

Mass works best as part of a complete assembly.

MLV adds mass, but overall performance also depends on framing, insulation, air sealing, decoupling, and finish layers. Treat STC values as assembly-level performance—not a promise from one material by itself.

Design around the weak pointsDoors, windows, outlets, penetrations, flanking paths, and unsealed edges can limit the performance of an otherwise strong wall or ceiling assembly.

Key design factors

Added massMLV

Cavity absorptionBatt / mineral wool

Air sealingSeams + perimeter

DecouplingAssembly dependent

Finish layerDrywall / panel

PerformanceAssembly dependent

Mechanical Equipment

Control breakout noise around equipment and enclosures.

MLV can add mass to equipment enclosures, generator housings, HVAC barriers, and other sheet-metal or framed assemblies. Maintain ventilation, service access, and required clearances.

Do not block required airflowSound-control materials should never compromise equipment ventilation, combustion air, heat rejection, access panels, or manufacturer-required clearances.

HVACGeneratorsMechanical roomsEnclosures

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Pipes & Ducts

Wrap noisy pipes and ducts with a layered barrier system.

Use MLV as the mass layer in pipe or duct lagging systems to reduce sound radiating through thin walls. Pair it with an appropriate decoupling or absorptive layer when the assembly calls for one.

Seal the wrapTight seams, overlaps, penetrations, and transitions matter. Gaps in a lagging system can become dominant sound paths.

Drain linesSoil stacksDuctworkUtility piping

The full system

Vehicles

Add mass to vehicle panels where road and drivetrain noise enter.

MLV is commonly used on floors, cargo areas, doors, wheel wells, and firewall assemblies. Fit pieces carefully so they do not interfere with seats, wiring, drainage, airbags, service access, or moving components.

Use the right layer for the jobMLV is a barrier layer. It is often paired with vibration damping and decoupling materials rather than used as a substitute for them.

Cargo vansAutomotive floorsDoorsWheel wells