This will give the MLV a way to flex or move from side to side as well as allowing it to resonate inwards towards the stud or joist cavities. Now for a few more STC points, it is advisable to have a 1/8" gap where the foam backed MLV does not touch the edges of the adjoining walls, ceiling or floor.
The next step is to tape the caulked seams, it is not necessary to tape the perimeter. You will also need to caulk the entire perimeter of the newly installed vinyl. The foam backing will face towards the existing drywall and all seams will be caulked liberally with an acoustical caulking. The foam backed MLV can be nailed or screwed directly to existing drywall, hitting the studs and joists as much as possible. That is why we recommend using the mass loaded vinyl with the standard or the premium foam backing.
#Mass loaded vinyl over drywall full#
If the MLV is sandwiched between drywall, it is virtually impossible for it to move or resonate, so in essence you will only be experiencing a fraction of the vinyls full soundproofing potential. Basically regular mass loaded vinyl needs to be able to move or resonate as the sound tries to pass. There is a misconception about mass loaded vinyl being sandwiched between 2 layers of drywall. I will discuss one very effective method in this article. There are many ways to get effective soundproofing without removing the existing sheetrock. There are a lot of people out there who want to soundproof walls and ceilings, but do not want to demo (demolish) the existing drywall.
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