Mass Loaded Vinyl (MLV) is a dense, flexible material used for soundproofing walls, floors, ceilings, and even vehicles. Made from vinyl combined with barium sulfate or other mineral fillers, MLV effectively blocks noise by adding mass to structures. But one common question is: Is MLV waterproof?

Is Mass Loaded Vinyl Waterproof?

Yes, standard MLV is inherently waterproof because it is made from vinyl, a synthetic plastic polymer that resists moisture. This makes it suitable for damp environments where other soundproofing materials might degrade.

Key Waterproof Properties of MLV:

• Vinyl Composition – Naturally repels water and moisture.
• No Absorbent Fillers – Unlike fiberglass or foam, it won’t soak up water.
• Mold & Mildew Resistant – Does not promote bacterial growth in humid conditions.

Where Can You Use MLV in Wet or Damp Areas?

Since MLV is waterproof, it can be used in:

• Bathrooms & Showers – Behind tiles or under flooring for noise reduction.
• Basements – Helps with soundproofing in moisture-prone areas.
• Kitchens & Laundry Rooms – Resistant to spills and humidity.
• Exterior Walls & Automotive Applications – Withstands rain and condensation.

Limitations & Considerations

While MLV itself is waterproof, proper installation is key:

• Sealing Edges – Use waterproof acoustic sealant to prevent moisture seepage.
• Avoid Prolonged Submersion – MLV is water-resistant, not designed for underwater use.
• Check Adhesives & Barriers – Some MLV installations may include non-waterproof layers (e.g., foam backing).

Alternative Waterproof Soundproofing Solutions

If MLV isn’t suitable for your project, consider:

• Closed-Cell Foam – Water-resistant and lightweight.
• Rubber Mats – Good for flooring in wet areas.
• Green Glue & Waterproof Drywall – For moisture-prone walls.

Conclusion

Mass Loaded Vinyl is waterproof and highly effective for soundproofing in damp or humid environments. Its durability and moisture resistance make it ideal for bathrooms, basements, and even outdoor applications—as long as it’s installed correctly.