Measure the length and width of the wall or ceiling where the MLV will be installed. Decide if your seams will be placed on the studs or if they will occur inside the joist cavaties, and adjust your measurements accordingly. Seams placed in joist cavities must be overlapped 2 in.
STEP 2 - MEASURE AND CUT THE MLV
Unroll the MLV and measure and mark the MLV corresponding to the wall or ceiling dimensions. Subtract 1/4 in. from the height of the walls to allow space for acoustic sealant. (For ceilings consider the height to be the dimension that runs parallel to the studs).
Cut the MLV using a straight edge or T-square and a utility knife. Make sure to cut the pieces a little bit larger in the direction of the length of the wall so as to allow the MLV to have some slack when installed loosely. (For ceilings, consider the length to be the dimension that runs perpendicular to the studs).
STEP 3a - INSTALL MLV (WALLS)
With assistance from a 2nd installer, place the MLV in the top corner of the wall, and make sure the
Fasten the MLV along the top plate with at least 5 fasteners (plus corresponding caps or washers - see installation notes on previous page). Be careful not to let the MLV tear under it's own weight. Continue fastening the MLV along the top plate placing fasteners every 24 in. Remember to leave a little slack in the MLV between studs.MLV is positioned straight.
Fasten the MLV to the studs from top to bottom, every 24 in. Fasten the MLV to the bottom plate, leaving 24 in. between fasteners.
STEP 3b - INSTALL MLV (CEILING)
With assistance from a 2nd and 3rd installer, place the MLV in one corner of the ceiling, and make sure the MLV is positioned straight. The MLV will be installed perpendicular to the ceiling joists.
Fasten the MLV along one outer-most joist with at least 5 fasteners (plus corresponding caps or washers - see installation notes on previous page). Be careful not to let the MLV tear under it's own weight. Continue fastening the MLV along each joist placing fasteners every 24 in. Remember to leave a little slack in the MLV between joists.
STEP 4 - TAPE SEAMS
Adhere vinyl or foil tape along any seams between sheets of MLV. If the seams exist along joists, cover with one layer of tape. If the seams exist between studs, cover with at least two layers of seam tape.
STEP 5 - FINISH MLV DETAILS
Make sure all fasteners are flush to the wall or ceiling.
Cut holes in the MLV where necessary for light switches, electrical outlets, lighting fixtures, etc.
Seal the gap around the perimeter of the MLV with acoustic sealant.
STEP 6 - INSTALL DRYWALL
Lift drywall into place and fasten with appropriate dry wall screws. Tape and mud as needed.
Make sure to Leave a 1/4" gap around the perimeter of the wall or ceiling, using shims at the bottom of the wall panels as needed.
Fill the 1/4 in. gap around the perimeter with acoustic sealant.
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