Question Soundproofing queries

Discussion in 'Home Cinema Building DIY' started by mo786, Jun 21, 2015.

  1. mo786

    mo786
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    Hi

    I am doing some work on the hosue and have built an independent stud wall.

    Its 63mm CLS with a 3 or 4cm gap.

    I am planning on filling it with wither 50 or 60mm rockwool which sits inside the CLS ro getting 75mm which will go outside the CLS into the airgap making the airgap smaller (but still about 1cm).

    My questions are

    1 - should I retain the 3 or 4cm gap and just use 50 or 60mm rockwool or should i just get 75mm in and therefore reduce the airgap - most places say the airgap only needs to be 1 to 1.5cm anyway.
    If the rockwool is sticking out the back I also need to ensure it doesn't fall out but this shouldn't be a problem.


    The wall was originally meant to be 75mm studwork hence this query.

    2 - if I have the gap do I really need the resilient bars?

    3 - if I plasterboard and then use accoustic sealant can you skim over the sealant? I am not double boarding so can't seal the bottom layer and then not seal the top layer. I also want to put the accoustic sealant around plugs - which I assume happens when boarded but before skimming.

    I am unsure whether the skim will adhere to the sealant properly.

    Thanks
     
  2. Peter Parker

    Peter Parker
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    I've seen it said that having the rockwool to the back can help prevent fire creeping up behind the stud wall should there be one, but I don't usually see that mentioned. I'm not sure how much sound transfer you will get if the rockwool is touching the wall you want to isolate but I wouldn't think it would be much. Not touching obviously makes sure that there is no transfer and is ideal I would think.

    If you're worried about plastering over the sealant around the edges, use scrim tape to go over it and you shouldn't get any cracking.

    Any reason you're not using two layers?

    Gary
     
  3. mo786

    mo786
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    was just gonna go single 15mm board to save space on say 2 12.5mm

    If I have resiliant bars that will obv also take away extra space.
     
  4. Peter Parker

    Peter Parker
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