1 LB Mass Loaded Vinyl 4' × 25' (100 SF) STC 26 Soundproofing

Manufacturer-Direct Mass Loaded Vinyl

EnviroFlex™ 1 LB Mass Loaded Vinyl is manufactured by EnviroFlex, a Quebec-based producer of recycled rubber and vinyl products. When you buy from Sheets & Rolls, you're buying directly from the source — no distributor, no middleman, no markup stacked on top of someone else's margin. The same commercial-grade MLV used by acoustical contractors on professional installations is available to you at trade pricing.

How it works

Mass loaded vinyl works on a simple principle: sound transmission through a wall, floor, or ceiling is directly related to the mass of that assembly. Heavier surfaces transmit less sound. MLV adds mass in a thin, flexible, limp layer — dense enough to meaningfully block airborne noise, flexible enough to install on irregular surfaces, in vehicle door cavities, and behind finished wall assemblies without requiring structural modifications.

EnviroFlex 1LB MLV carries a 26 STC (Sound Transmission Class) rating, which corresponds to a reduction of approximately 20 dB in airborne sound — enough to reduce loud conversation to barely audible levels through a treated wall or ceiling.

What it's used for

• Apartment and condo party walls — blocking neighbor noise
• Home theater walls, floors, and ceilings
• Recording studio isolation
• HVAC duct wrapping and mechanical room liners
• Generator and compressor enclosures
• Cargo van and truck cab soundproofing
• Boat engine bay insulation
• Basement ceiling liners beneath noisy rooms
• Laundry room and home office walls

Installation

Cut to size with a standard utility knife — score and snap, or cut cleanly in a single pass. Fasten to wall studs or ceiling joists using screws with large fender washers, cap nails, or construction adhesive. The material is flexible enough to drape over curves, wrap around corners, and fit inside irregular cavities. Seal all seams and perimeter edges with EnviroFlex MLV Seam Tape to maintain the acoustic barrier. Ships rolled — unroll and allow 15–20 minutes to relax flat before cutting.

Specifications

Why buy from Sheets & Rolls?

• Manufacturer-direct pricing — you're buying from EnviroFlex, not a reseller
• Free shipping on all MLV orders
• Price match guarantee — find it lower anywhere, we'll match it
• Volume discounts available — contact us for project pricing
• Real product support — call or email and you'll reach someone who knows the product

Need help sizing your project? Use our Soundproofing Calculator or contact us directly.