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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorbardo
    • CommentTimeMar 18th 2020
     
    Hi all, advice please on best ways to sound proof between internal timber 4 x 2 stud walls using plasterboard and some kind of acoustic insulation. What type of board and what type of wool, synthetic or natural for the insulation. I don't want to go too far with this, just considering basic privacy with bathroom and bedrooms.

    Cheers,
    • CommentAuthorbhommels
    • CommentTimeMar 18th 2020
     
    http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16485
    •  
      CommentAuthordjh
    • CommentTimeMar 18th 2020
     
    As a summary:
    - insulation should be acoustic rockwool and should not be as thick as the cavity is wide, so there's a gap.
    - ideally and for not much extra money, put the boards on one side on resilient bars to isolate them.
    - the boards want to be as heavy as possible. Simplest is normal plasterboard, better is [heavier] acoustic plasterboard*, alternative is multiple layers of plasterboard held togehter with acoustic sealant (AC50 et al). Other treatments include mass-loaded vinyl sheets on the back of plasterboard or between layers. One trick we used was to glue all our offcuts of plasterboard to the back of sheets with AC50 to increase the weight a bit and reduce waste.

    * or maybe moisture-resistant plasterboard for a bathroom; that's pretty heavy.
    • CommentAuthortony
    • CommentTimeMar 19th 2020
     
    I like double acoustic plasterboard both sides, one lot on resilient bars and all four layers of different thickness and as above for the frame with rockwool

    Concrete blocks work best

    Need to seal all cracks, gaps above the ceiling and below the floor in all cases
  1.  
    Interesting this one.

    We put acoustic rock wool in all our internal walls and between the floors. The wooden flooring on the upper floors is laid over UFH which runs in acoustic overlay panels. Wallboard was Fermacell

    I was expecting that to give pretty good soundproofing but I don't actually notice a real improvement over previous houses I've lived in - either victorian or 80's new build, neither of which would have any any sound insulation at all.

    I suspect hard floors don't help (I'd carpet upstairs if I was building again).
    •  
      CommentAuthordjh
    • CommentTimeMar 19th 2020 edited
     
    Posted By: tonyNeed to seal all cracks, gaps above the ceiling and below the floor in all cases

    In most cases joists will run across the top from room to room. Are you suggesting it's normal good practice to block all those gaps?

    FWIW, we didn't do anything like that. We have acoustic rockwool in the ceiling and the ceiling on resilient bars and all cracks at corners etc sealed. That seems to work pretty well for us; I haven't regretted not doing more.
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