Acoustimac Soundlock Mass Loaded Vinyl review

Mass loaded vinyl is the material contractors reach for when a wall needs more mass, and Acoustimac's Soundlock roll is a clearly documented version sold direct. The 1 lb density roll is 1/8 inch thick and 4 by 12.5 feet, covering 50 square feet, and Acoustimac lists STC values between 10 and 45 across 100 to 4000 Hz. The company says it can go on walls, ceilings, floors and doors, and it posts installation instructions, a safety data sheet and sound transmission test results as PDFs. A 2 lb version and a 100 square foot roll are also sold. For most renters this is the last item on the list rather than the first: vinyl is heavy, it works best fixed behind drywall or sandwiched in a door, and seams must be sealed. If you own your unit or your landlord agrees to a project, it is the most direct way to add mass to a shared wall. At $96.95 per roll, it is priced fairly for the coverage.

Who it is for

Owners, or tenants with landlord permission, who can add a dense barrier layer to a shared wall or door.

Price

$96.95 for a 50 sq ft roll of 1 lb vinyl on the Acoustimac US store.

Acoustimac Soundlock Mass Loaded Vinyl 1lb Soundproofing barrier roll 50 sqft 12.5'x4' $109.99 $96.95
Quoted from the vendor pricing page on November 8, 2026.

Key features

• 1 lb per square foot density, 1/8 inch thick
• 4 x 12.5 foot roll covering 50 square feet
• Acoustimac lists STC values between 10 and 45 from 100 to 4000 Hz
• For walls, ceilings, floors, doors, windows and serve-through openings
• Installation guide, safety data sheet and transmission test results available as PDFs

Strengths and weaknesses

• Strength: Adds real mass, which is what blocking sound requires
• Strength: Thin enough to sit behind drywall or on a door
• Strength: 2 lb density and 100 sq ft rolls also available
• Weakness: Heavy and hard to hang well without construction work
• Weakness: Usually needs landlord permission in a rental
• Weakness: Gaps and seams must be sealed or performance drops

Key facts

• Price: $96.95 per 50 sq ft roll
• Density: 1 lb per sq ft
• Thickness: 1/8 in
• Roll size: 4 x 12.5 ft

Where it ranks

Acoustimac Soundlock Mass Loaded Vinyl is No. 9 in our Best Soundproofing Products verdict.