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Green Building Bible, Fourth Edition
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    Apologies if this has been posted before, but I can't really find what I'm looking for. I'm wondering about ways of construction internal walls. The external walls are hempcrete, and I'm planning on lime plastering them. I'd like to take the lime plaster all the way round the internal walls too, so was thinking I'd need some kind of carrier board. I'll use untreated timber stud work, but what about the build up of the rest of the wall, I guess for sound insulation primarily? I'd be interested in something environmentally friendly and economical. Any comments would be appreciated!
    Not certain, re sound insulation, but have you looked at Heraklith (wood-wool) boards? Got a bit of cement in, but quite heavy, IIRC.
    • CommentAuthortony
    • CommentTimeMar 3rd 2017
    Wattles daubed then lime plastered?
    • CommentAuthorgyrogear
    • CommentTimeMar 3rd 2017 edited
    Or bamboo cane lattices, pegged to the wall face then lime plastered ?

    see "bamboo lathe and plaster wall, thailand"

    OR : https://fr.pinterest.com/pin/556546466427853869/

    +1 for Heraklith (wood-wool) boards

    We have 25mm thickness in our ceilings and 15mm in the stud walls. They have some acoustic and thermal insulation qualities (not a huge amount but certainly more than solid plaster boards) and are fire resistant.

    I can attest to their fire resistance as I tend to put any wood off-cuts (i.e. from building stud walls) into our wood burner and I forgot the wood wool boards were fire proof. I put some bits in a roaring fire and they were still there when the fire went out hours later.

    You can also get them bonded to insulation, the ones I saw had rockwool sandwiched between the woodwool faces.

    They carry lime plaster really well, even for a rubbish plasterer like myself (I do the bottom layers and get a pro to do the finish/top coat).
    A carrier board sounds a good idea. How about within the walls? I was wondering about clay.
    I've found one useful thread here: http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9429&page=1#Item_0
    Is PB really that bad?
    We're using lime plaster for the external walls, so we'd prefer to also use lime plaster on the internal walls.
    • CommentAuthordelprado
    • CommentTimeMar 4th 2017
    Clay boards are the most environmentally reductions you can buy and they have massive thermal mass and superb sound proofing with wood fibre
    Thanks @delprado. Can you provide more information about clay boards please? I'm not sure what you're referring to.
    • CommentAuthordelprado
    • CommentTimeMar 5th 2017
    Boards literally made out of clay. They are expensive (but these are cheaper than claytec)


    They are literally lumps of mud with fibreglass running through it (serving the purpose much like cardboard with conventional plasterboard).

    I used clay because apparently its really good at neutralising smells and buffering humidity. But its incredible mass is really effective at absorbing sound, especially when used with high mass pavatex wood fibre batts
    Thanks @delprado!
    • CommentTimeMar 7th 2017
    FWIW, my external walls have lime plaster and my internal walls are conventional studwork, plasterboard and gypsum plaster skim. I used the same clay paint everywhere.
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