Cavity Sliding Door - Mass Loaded Vinyl for sound proofing

rusty_spoon · Jun 21, 2018 7:52 pm

Hi

I am researching ways to reduce noise transfer via the empty ‘pocket’ in the wall where the cavity sliding door sits when open. This pocket cannot be filled with acoustic insulation due to obvious reasons.

I have stumbled across MLV (mass loaded vinyl) which is a thin, flexible noise barrier. The barrier is approximately 3mm in thickness.

My question: how much clearance is there inside the CSD frame between the door itself? I was hoping to install the MLV on the inside CSD frame, where the door sits.

Is there a better way to mount this? The outside edge of the csd frame, behind the gyprock, is likely to interfere with the gyprock as it will cause a raised section of gyprock where the cavity is. I don’t wish to cover the whole wall in MLV as I will have acoustic insulation in the rest of the wall.

Thanks

rusty_spoon · Jun 23, 2018 6:17 pm

Has anyone used any other methods to reduce sound transfer through the pocket cavity?

alexp79 · Jun 24, 2018 11:49 am

The best way to insulate acoustically will be to use either staggered studs or double studs (better) and then attach double layer of gyprock over furring channels which are attached to the studs using noise proofing clips.

If you could also get some Green Glue between your gyprock layers, you will get the best sound insulation you could possibly achieve (+25-30 STC to your current level easily, sound studio level).

MLV will never get close enough (may be +10 STC max, depending on the density of the vynil you are planning to use).

If you are using sound batts for acoustic insulation, you only get up to 5 STC max, but usually 2-3 STC.

alexp79 · Jun 24, 2018 11:55 am

And yes, if you still want to use MLV, best way will be to cover the full section of the pocket wall between gyprock and studs.