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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.

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    • CommentTimeJan 12th 2019
    Any ideas for a lightweight finish direct onto EPS EWI – other than render or claddings like boarding, sheeting etc?

    The application - don’t laugh – wd be EWI on end-of-life caravan, now static, for use as office/studio/guest sleeping.
    All the crummy interior wd be stripped out, surfaces made good, pretty wallpaper, nice furniture from the auction rooms, painted. No cooking or washing facilities, just a room.

    The usual bugbear, damp, would be ended – it has two sources:

    Leakage stopped by the EWI ‘tea cosy’, the walls finished externally with the whatever, the roof having an aerofoil-curved ventilated Onduline rainscreen overhanging 200mm all round;

    Interstitial condensation stopped by the 75mm EPS EWI fixed outboard of the vapour barrier that the aluminium skin forms.

    The EPS fixed using spider-web spray contact adhesive or non-expanding insulation-fix squirty ‘foam’ – all joints foamed. I have a hot wire cutting table, which easily makes precision cuts in white EPS (grey problematic).
    Angled/splay cuts around (most of) the windows and door.
    Proper lead-faced Flashband would be dressed over the splays and onto the rubber gasket face against which the windows close and seal.

    So what as a lightweight finish direct onto the EPS EWI? I have so far thought of glassfibre mesh, UV proof, rollered into more of the spider-web spray contact adhesive while still wet. Slick enough that rain runs off, but vapour permeable.

    Any ideas/comments?
    • CommentAuthortony
    • CommentTimeJan 12th 2019
    Nylon mesh and acrylic render from tubs or lime wash
    • CommentTimeJan 13th 2019
    You reckon limewash in place of render? Sounds good. Will it stick to nylon? The whole idea is to avoid the work and weight of rendering.

    BTW, I think 'nylon' is a central European term used for any plastic incl prob the glassfibre mesh which AFAIK is what EWI render mesh is. Is that the stuff you mean?
    Tom, when you say 'glassfibre mesh' do you mean the sort of reinforcing mesh used in EWI render systems and wood-fibre IWI, or do you mean the sort of glass-fibre 'cloth' which is used on phenolic foam boards for EWI? The latter would probably work, but the former, with lime-wash or anything thinner than render, will surely just leave you with the appearance of painted mesh.

    How about the very thin glass-fibre cloth with silicone silicate paint over?


    ''Product Description
    This incredibly light woven glass fibre reinforcement, at only 25gsm, is just about as light a fabric as can be laminated by hand. Even off the roll the fabric is almost transparent and incredibly thin. The weave pitch is a diminutive 24 picks per centimetre!

    Uses and Suitability
    Such a light fabric is used almost exclusively by radio controlled aircraft builders and U.A.V. (Unmanned Air Vehicle) builders wanting to laminate very thin skins of GRP onto aircraft wings and fuselages as a wing skin glass cloth or fibreglass wing skin.

    This woven 'E' glass does not include any chemical binders and therefore is suitable for use with any resin system including epoxy, polyester and vinylester.''

    Silicone paint: https://ewistore.co.uk/shop/ewi-005-silicone-paint-5l/

    No connection with either firm other than as a customer of the latter.
    • CommentTimeJan 13th 2019
    Posted By: fostertomYou reckon limewash in place of render?

    How does that work then? Limewash is a very thin paint. Takes multiple coats to achieve anything.

    Surely there are paints that will adhere to EPS, perhaps with a primer? Or maybe cover the whole lot with exterior hardboard?
    • CommentAuthorgyrogear
    • CommentTimeJan 13th 2019
    Posted By: fostertomSo what as a lightweight finish direct onto the EPS EWI?

    I am planning on simple cement board, 3mm thick, cemented over the insulation then given a good coat of facade paint.

    This is limited EWI around my garage door piers & reveals, which are a dreadful heat-sink.

    • CommentTimeJan 14th 2019 edited
    I was thinking of the EWI-surface reinforcing type mesh, but thanks for that source on glass fibre Nick - lots of info there.

    Prob actually the heavier cloth/mesh/fabrics would be more robust, and it won't be continuously bonded - spider-web of spray contact adhesive or similar - in order to leave open area for vapour permeability - unless some vapour-permeable adhesive capable of thin even application i.e. prob not the non-expanding squity 'foam' adhesive.

    Silicate paint gd idea. I wouldn't mind the mesh grinning through, as long as it cd be applied as neatly as wallpaper.

    Overall shape will be quite 'moulded' in parts - so a board finish isn't on. Jointlessness will be important. The paint won't really 'see' the EPS - it'll be sticking to the cloth/mesh.
    Gyrogear , when you say cement board cemented , what exactly where you thinking of cementing it with ?
    Tom, Is fireproofing an issue? as you know the thincoat render does that job
    • CommentAuthorjamesingram
    • CommentTimeJan 17th 2019 edited
    not vapour open , horrible plastic .. but quick and easy
    Hoarding boards 3mm , nice bright colours
    • CommentAuthorgyrogear
    • CommentTimeJan 17th 2019
    Posted By: jamesingramGyrogear , when you say cement board cemented , what exactly where you thinking of cementing it with ?

    probably PVC cement, otherwise adhesive mortar.

    • CommentTimeJan 17th 2019
    Freestanding (ex)caravan(s), plenty of space away from any other manmade things - will ignore fireproofing.
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