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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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    • CommentAuthordelprado
    • CommentTimeDec 5th 2017
    What does everyone think about this? The coefficient looks really impressive for a hard product - no idea how it achieves that?

    • CommentAuthortony
    • CommentTimeDec 5th 2017
    Sound absorbing plaster, do you mean absorbing sounds made in the room or noise coming in from the other sides of the walls or ceilings?
    • CommentAuthorBeau
    • CommentTimeDec 6th 2017
    At 27mm thick it seems more than possible. Could do with something like that here so will be following this with interest.
    What's the difference in sound levels compared to 2 boards of DB and skim finish?
    <blockquote><cite>Posted By: Victorianeco</cite>What's the difference in sound levels compared to 2 boards of DB and skim finish?</blockquote>

    Was wondering that too also. Suspect that would be a whole lot cheaper, but indeed, how does that compare acoustic wise?
    • CommentAuthorMike1
    • CommentTimeDec 7th 2017 edited
    Posted By: tonySound absorbing plaster, do you mean absorbing sounds made in the room or noise coming in from the other sides of the walls or ceilings?

    This particular product is used to reduce reverberation and noise levels within the room in which the noise is generated. Acoustic plasters are (often much) thicker than regular plasters and are normally aerated using a foaming agent (such as aluminum powder) to incorporate pores that absorb and convert the sound wave energy into heat.
    • CommentAuthorMike1
    • CommentTimeDec 7th 2017
    Posted By: VictorianecoWhat's the difference in sound levels compared to 2 boards of DB and skim finish?

    That's aimed at reducing sound transmission, rather than reverberation, so not comparable.
    We have used that very product on the ceiling of the kitchen/dining room, which is open plan to the stairs leading up to the bedrooms in a minimalist house with hard floors. Sound does still carry up the stairs, but you can tell that the acoustic in the treated room is less echoing than the rest of the house, so I think it's helping though hard to quantify.
    It was very expensive, but we were pleased with the firm. They tinted it to match our wall colour and got it wrong first time, but were happy to come back and respray it to get the colour right.
    They put on a squashy fibrous sort of board first, then spray it with a foamy sort of coating which looks just like plaster but has tiny pores which absorb the sound.
    • CommentAuthordelprado
    • CommentTimeDec 20th 2017
    Apparently clay plaster is very absorbent of sound
    • CommentAuthordelprado
    • CommentTimeDec 29th 2017
    Here is another one with a lower coefficient but at least its "just" a wet plaster that goes on the wall:


    Further research on clay is ongoing - clearly it has good mass - but the clay works plaster suggests a sound absorban coefficient of only 0.09 which is rubbish!
    • CommentAuthordelprado
    • CommentTimeJan 10th 2018
    I think the boy thing these plasters are doing is stopping noise going out or coming into a room not reflections in he room, despite their sound absorption factor, because they are finished with a conventional flat, reflective finish of lime
    • CommentAuthorCWatters
    • CommentTimeJan 15th 2018 edited
    The tech spec says..

    The 27mm construction consists of 2mm adhesive, 20mm thick mineral board, base and top coat Oscar Elite synthetic acoustic plaster totalling approximately 5mm

    Not clear to me which bit provides most of the sound absorption.

    They say to improve the sound absorption at low frequencies you add an air gap of 60-125mm in addition to the 27mm make up. The combination of an air gap and a mass layer are standard methods of absorbing noise.

    See also..


    Anyone know how to convert/compare "sound absorption coefficients" to "Rw dB"?
    • CommentAuthordelprado
    • CommentTimeJan 15th 2018
    CW - the only unique thing about that oscar stuff is your finish is nto reflective. As you say everything behind it is standard spec for reducing noise
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