Mass loaded vinyl (MLV) is utilized as a sound barrier in walls, floors, and ceilings to reduce noise transmission, functioning similarly to materials like green glue or lead sheeting. Installation is achievable for both professional sound engineers and do-it-yourself enthusiasts. This article details the process of installing MLV, covering necessary materials, preparation, and step-by-step instructions for walls, ceilings, and floors.
Materials Required for Installation
Successful MLV installation requires specific tools and materials. These include the mass loaded vinyl itself, available with or without a pressure-sensitive adhesive. Stepladders are necessary to reach higher areas of walls and ceilings. Accurate measurements are obtained using a tape measure, and markings are made with a pencil or chalk. A T-square or straight edge guides a utility blade for precise cuts.
Fastening requires a hammer, pneumatic cap stapler, or heavy-duty nail gun, along with appropriate fasteners such as roofing nails, cap staples, or collated nails. Washers should be used if fasteners lack caps. Acoustical sealant and a caulking gun are essential for sealing gaps, while construction adhesive is needed for floor applications. Vinyl tape, specifically Quiet Barrier® tape, helps seal seams between MLV sheets.
Optional materials that may be beneficial include putty pads for electrical outlets, adequately sized plywood sheets for ceiling installations, and a drywall lift.
Preparing for Installation
Prior to installation, preparation steps can enhance the outcome. Applying putty pads to electrical outlets and switches minimizes air gaps that can compromise soundproofing. If using self-adhesive MLV, the backing can be peeled off and the material pressed firmly onto the studs. When installing on existing walls, locating the studs is crucial, especially since they are often concealed behind drywall. A stud finder is recommended for this purpose. Accurate measurements are vital, and it is advisable to subtract 1/8 to ¼ inch from the wall’s height when cutting the MLV.
Installing MLV on Walls
The installation process for walls involves several steps. First, the MLV is measured and cut to size using a utility blade and a straight edge. Assistance from another person is helpful for lifting and supporting the MLV between the floor and ceiling. The material is then fastened to the studs using nails, screws, or staples, spaced approximately every 8 inches along the length of the studs.
As the MLV is installed, it should be pressed against electrical outlets, switches, and other objects. The utility knife is then used to carefully cut around these obstructions, exposing the boxes. Where MLV pieces meet at a stud, they should be pressed together without overlapping. Acoustical sealant and vinyl tape are used to seal any resulting breaks. For optimal results, seams should align with the center of the studs.
Installing MLV on Ceilings
Installing MLV on ceilings typically involves attaching it to the joists. The process often begins with measuring and cutting the MLV to the appropriate size, then attaching it to a pre-measured and pre-drilled plywood sheet. A drywall lift is used to raise the plywood and MLV into position. Fasteners are driven through the pre-drilled holes, spaced every 8 to 12 inches, ensuring the holes are large enough to allow for board removal later. The center of the MLV is secured to prevent drooping. Seams should avoid meeting directly over joists, instead butting up where they can be mechanically fastened. The final step involves installing drywall over the MLV.
Installing MLV on Floors
Floor installation is generally the simplest method, as the MLV does not require support during fastening. The floor surface is measured, accounting for walls and trim boards. The MLV is laid out in a brick formation, and any necessary cuts are marked with chalk or a pencil. A ¼-inch gap is left around the perimeter for acoustical sealant. The MLV is cut using a utility knife and T-square. Construction adhesive is used during floor installations.
Additional Installation Considerations
When working with existing walls, the MLV is fastened horizontally at the top first, then worked downwards, securing the material every 36 inches at the studs. Overlapping MLV pieces should be avoided; instead, seams should be butted together and sealed with seam seal tape. After installation, any areas covered by MLV around electrical outlets and other openings are carefully cut open to expose them. Finally, acoustical sealant is applied around the perimeter to ensure a complete seal.
For installations under drywall, measurements should include a ½-inch gap around the perimeter. The MLV is cut to size using heavy-duty scissors or a utility knife, and a straight edge or T-square ensures straight cuts. The material is stripped at a corner of the wall with assistance, ensuring it drapes evenly. Fastening begins horizontally at the top and progresses downwards. If seams terminate on a stud, they are butted together, caulked, and taped. If they terminate between studs, they are overlapped by about 2 inches and taped.
Tips for Enhanced Performance
To maximize the effectiveness of MLV, several tips should be considered. Proper sealing is essential, and acoustical sealant should be used to caulk the perimeter. When installing on walls, it is recommended to fasten the sound barrier every 12 inches. Seams should be carefully sealed with vinyl tape to prevent sound leakage. Accurate measurements and precise cuts contribute to a professional and effective installation.
Conclusion
Installing mass loaded vinyl is a viable method for reducing noise transmission in residential, commercial, and industrial settings. Careful preparation, accurate measurements, and adherence to the outlined steps are crucial for successful installation on walls, ceilings, and floors. Utilizing the appropriate tools and materials, along with attention to detail, will result in a quieter and more comfortable environment.