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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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    • CommentAuthordelprado
    • CommentTimeDec 28th 2017
    I'd like to batton out one room in my house (walls are brick built cavity, with 70mm of eps in cavity) so I can run cables, but also so I can have sound absorbing walls.

    How can I do this without creating an excessively low u value and risk interstitial condensation?

    • CommentAuthortony
    • CommentTimeDec 28th 2017
    Just do it, wet plaster or page coat the walls first

    For the OCD do a condensation risk chart or run a model, but it will be OK
    As you describe it, you have not yet added any thermal insulation, so what do you think is the risk of interstitial condensation? (Assuming the original wall construction passed a condensation risk assessment).
    • CommentAuthordelprado
    • CommentTimeJan 9th 2018
    So at the moment I have a cavity wall, which has 70mm of eps already in it. I am going to add more insulation internally. I dont want to if its going to create risk of condensation?
    I see. I had taken the batten space as a cable void, with sound-deadening boards on top - without providing significant additional *thermal* insulation. Do you want additional thermal insulation as well as acoustic? If not, you could use something like this: https://www.soundproofingstore.co.uk/store/SoundBoard-3-(1-2m2)-24mm-p52219203. (Other suppliers exist - I didn't use this one, but they seem cheaper than the one I did use!)
    • CommentAuthordelprado
    • CommentTimeJan 16th 2018
    What I really want is not more mass, but an absorbent layer. I can't find an absorbent layer which does not also add insulation.

    Alternatively, shall I just forget about finding that and just insulate?
    • CommentTimeJan 16th 2018
    Posted By: Nick ParsonsIf not, you could use something like this: https://www.soundproofingstore.co.uk/store/SoundBoard-3-(1-2m2)-24mm-p52219203

    I'm a bit confused. That board is designed to reduce sound transmitted through it, specifically by reflecting high frequency sound back into the room. Is that what delprado wants?

    I had thought he was looking to damp the acoustics within the room, which would point more towards surface treatments such as uneven cork bark, or cloth panels over acoustic foam etc.
    I think I am confused too! I read (sound) 'absorbing' as (sound) 'proof'. @ delprado, can you clarify?

    It's amazing the difference just soft furnishings make. I know a bar which, when first opened, was so 'boomy' that I simply could not hear conversations (nothing to do with nearly 50 years of drumming, honest!). Simply adding a few cushions made a massive difference.
    • CommentAuthorSilky
    • CommentTimeJan 17th 2018
    presuming the goal is to improve the acoustics then what Nick said, you don't really want to completely cover the walls as this would make the sound totally 'dead', 80% of getting a good sound is 'the room', sound absorbing materials are usually placed to eliminate any particularly exaggerated frequencies - not to kill reflection of sound completely. Google 'mastering studios' and look at the panels they place around the room, that is all you need, i.e. you probably want your sound to be more lively than a mastering studio and even they don't cover a complete wall.
    • CommentAuthordelprado
    • CommentTimeJan 18th 2018
    To be honest I wanted to kill both birds with the same stone. I figured by adding a sound absorbing plaster I'm removing reflections within the room, lowering transmittance outside of it, while at the same time removing the need to add sound absorbing panels later which are unsightly
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