How to Install Mass-Loaded Vinyl Behind Drywall to Reduce Unwanted Noise

Overview

Living with noise sensitivities can be challenging, especially when external sounds disrupt your peace at home. One effective method to enhance your home's soundproofing is by installing mass-loaded vinyl (MLV) behind your drywall. MLV is a dense, flexible material designed to block sound transmission, making it an excellent solution for creating a quieter living space.

This comprehensive guide will walk you through the process of installing MLV behind your existing drywall. By following these detailed steps, you'll significantly reduce unwanted noise and create a more serene environment in your home.

---

Difficulty: Medium
Cost: Expensive

---

Materials and Tools You'll Need

• Mass-Loaded Vinyl (MLV): Enough to cover all targeted walls.
• Drywall Panels: New sheets if replacing existing drywall.
• Drywall Screws: 1 1/4-inch for attaching drywall.
• MLV Fasteners: Roofing nails or screws with washers.
• Acoustic Caulk: For sealing gaps and seams.
• Tape Measure: For accurate measurements.
• Utility Knife: For cutting MLV and drywall.
• Stud Finder: To locate wall studs.
• Drill or Screwdriver: For fastening screws.
• Pry Bar and Hammer: If removing existing drywall.
• Safety Gear: Gloves, safety glasses, and dust mask.
• Ladder or Step Stool: If working on higher areas.
• Sealant Tape (Optional): For additional seam sealing.
• Soundproof Putty Pads: For sealing around outlets and switches.

---

Step-by-Step Instructions

Step 1: Planning and Preparation

1. Assess the Space:

   • Identify the walls where noise reduction is most needed.
   • Measure the height and width of each wall to determine the amount of MLV required.
   • Consider any obstacles like windows, doors, outlets, and switches.

2. Gather Materials:

   • Purchase high-quality MLV; it's available in various thicknesses (1/8-inch is standard).
   • Ensure you have all necessary tools and safety equipment before starting.

3. Safety First:

   • Wear protective gear: Gloves, safety glasses, and a dust mask.
   • Turn off electricity: Switch off power to the room at the circuit breaker to prevent accidents.

---

Step 2: Remove Existing Drywall (If Applicable)

If you're installing MLV during new construction or renovation that includes removing drywall, follow these steps:

1. Remove Fixtures:

   • Take off baseboards, molding, outlet covers, and switch plates carefully.

2. Cut the Drywall:

   • Use a utility knife to score along seams and corners.
   • Gently pry off drywall panels using a pry bar and hammer.

3. Dispose of Debris:

   • Remove nails or screws from studs.
   • Dispose of old drywall in accordance with local disposal regulations.

---

Step 3: Prepare the Wall Studs

1. Inspect Studs:

   • Check for any damage, mold, or pests in the wall cavities.
   • Repair or treat any issues before proceeding.

2. Seal Gaps and Cracks:

   • Use acoustic caulk to seal any gaps, cracks, or holes in the studs or wall cavities.
   • Sealing prevents sound from leaking through unintended openings.

---

Step 4: Install Mass-Loaded Vinyl (MLV)

1. Measure and Cut MLV:

   • Measure the height of the wall from floor to ceiling.
   • Cut MLV sheets to size using a utility knife. It's easier to handle smaller sections.

2. Apply MLV to Wall Studs:

   • Start at one corner of the wall.
   • Hang the MLV vertically, aligning the top edge with the ceiling.
   • MLV can be heavy; assistance may be required.

3. Secure MLV:

   • Use screws or nails with wide washers (MLV fasteners) to attach the MLV to studs.
   • Place fasteners every 8 inches along the edges and every 12 inches in the field.
   • Ensure the MLV is flat against the studs without sagging.

4. Overlap Seams:

   • Overlap adjacent sheets by at least 2 inches to prevent sound leaks.
   • Use sealant tape or acoustic caulk along overlaps for added sealing.

5. Cut Out Openings:

   • Locate electrical outlets and switches.
   • Cut the MLV around these openings, leaving a slight overlap.
   • Seal edges with acoustic caulk or soundproof putty pads.

6. Seal Perimeters:

   • Apply acoustic caulk along the top, bottom, and sides where the MLV meets the floor, ceiling, and adjoining walls.
   • This ensures there are no gaps for sound to pass through.

---

Step 5: Reinstall or Install New Drywall

1. Measure and Cut Drywall Panels:

   • Measure wall dimensions and cut drywall accordingly.
   • Mark locations of outlets and switches on the drywall for cutouts.

2. Attach Drywall Over MLV:

   • Lift the drywall panels into place over the MLV.
   • Secure to the studs using drywall screws every 12 inches along the studs.

3. Handle Outlets and Switches:

   • Cut out openings for electrical fixtures using a drywall saw.
   • Ensure they align properly with existing boxes.

4. Finish Drywall Seams:

   • Apply drywall tape over seams between panels.
   • Cover with joint compound (mud) and smooth out.
   • Allow to dry and sand for a smooth finish.

---

Step 6: Seal and Finish

1. Apply Acoustic Caulk:

   • Run a bead of acoustic caulk along all edges and joints, including:
     • Where drywall meets the ceiling and floor.
     • Corners and seams.
   • Smooth caulk with a caulking tool or your finger for a neat finish.

2. Install Baseboards and Molding:

   • Reattach or install new baseboards and molding.
   • Seal any gaps between molding and walls with acoustic caulk.

3. Replace Fixtures:

   • Reinstall outlet covers and switch plates.
   • Use soundproof outlet gaskets if desired for additional sealing.

4. Prime and Paint:

   • Apply a primer suitable for new drywall.
   • Paint the walls with your chosen color.

---

Step 7: Final Inspection and Clean-Up

1. Inspect Your Work:

   • Check all walls for any gaps, cracks, or missed spots.
   • Ensure all acoustic caulk is properly applied and dried.

2. Clean the Area:

   • Remove all debris, dust, and tools from the workspace.
   • Dispose of waste materials responsibly.

3. Restore Power:

   • Turn the electricity back on at the circuit breaker.

4. Test the Soundproofing:

   • Spend time in the room during different times of the day to assess the noise reduction.
   • Make note of any persistent noise issues for future improvement.

---

Additional Tips and Considerations

• Work with a Partner: MLV is heavy and cumbersome; having an extra pair of hands can make the installation process safer and more efficient.
• Temperature Considerations: MLV becomes more flexible in warmer temperatures. If it's cold, allow the MLV to warm up indoors before installation.
• Resilient Channels (Optional): For even better soundproofing, consider installing resilient channels between the MLV and drywall. They provide decoupling, reducing vibration transmission.
• Floors and Ceilings: Noise can also travel through floors and ceilings. Consider adding MLV or other soundproofing materials to these areas for comprehensive sound control.
• Consult a Professional: If you're unsure about any steps, especially regarding electrical work or structural changes, consult a licensed professional.

---

Conclusion

By installing mass-loaded vinyl behind your drywall, you've taken a significant step toward reducing unwanted noise in your home. Although this project requires time, effort, and a financial investment, the payoff is a more comfortable and serene living environment. Remember to work carefully through each step, prioritizing safety and attention to detail. With your enhanced soundproofing in place, you can enjoy the peace and quiet you deserve.

---

Note: Always follow local building codes and regulations when performing home improvements. If in doubt, consult with a professional contractor or soundproofing expert.