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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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    Hi All
    Would appreciate input from all.
    We are renovating an old farmhouse that predominantly has no insulation or heating.
    So far we have insulated between ceiling joists in various rooms where we can take up loft boards and stuff sheepswool between.
    Over our dining room however it is difficult to do this.
    i attach a detail cross section of ceiling construction.
    Above is a very large windy, unventilated loft, which we would like to use in spring and autumn (unheated/uninsulated) for yoga/spare bunkroom and the like.
    In the dining room we wish to keep the feel/look of the room with the white soffit between dark chestnut beams.
    So I'm looking for a insulating board that can be cut specifically to each gap fixed to underside of deck and then lined with heavy duty lining paper and painted.
    At 40mm thick (or so) it will improve a great deal the insulation and we can retain the very nice cherry boards above intact.
    I have considered at length taking these up, but after various thoughts and investigations and experience am unlikely to be persuaded otherwise!
    Any and all suggestions very welcome
    bty I have considered aerogel but after gaining a quote I'm looking for something much cheaper.
    I have just done a similar thing with Diffutherm wood-fibre boards between joists (other boards are available, cheaper), screwed up to the floorboards, meshed and lime plastered. Nothing like as good as Aerogel, or even Pu/PIR, but significantly better than nothing.
    Hi Nick
    Thanks for that suggestion, I've looked into those now and whilst almost ideal they are slightly thicker than I would like and have t&G edges, plus overall size might create a bit of waste.
    Despite all this would you say they could be papered over?
    Not looking for a fine finish, all surfaces in room quite rustic!
    Hi Andy,

    You said you were looking for a thickness of around 40mm. I used 40mm Diffutherm reveal board, which is not T&G. It's about 600 x 1200, and strangely, if I remember rightly, the 20mm version is 600 x 1100.

    I doubt you could paper it, though!
    • CommentAuthorRex
    • CommentTimeAug 11th 2018 edited
    Why not fill the entire 150mm with insulation.

    My house is a new build, timber frame and insulated with Warmcel. For the ceilings, I stapled the paper scrim, supplied by the Warmcel guys across the joists. Then they came in and blew the insulation into the space. Later, plaster boarded over. Full insulation, loads of sound deadening.
    • CommentAuthorowlman
    • CommentTimeAug 12th 2018
    For a not dissimilar job, I used ordinary plasterboard carefully cut to shape. I then laid it on the bench and stuck Styrofoam to the back with spray adhesive, then screw fixed. You can choose the Styrofoam thickness to suit.
    Careful "Foam gun,- fine nozzle" foam-filling around the edges and then the choice of finish is up to you, - plaster, standard or heavy duty or even themo-lining paper, and then emulsion finish.
    thanks guys but not quite what I was hoping for
    ideally want a woodfibre board capable of being papered, perhaps it doesn't exist!
    I'll keep hunting
    • CommentAuthorowlman
    • CommentTimeAug 15th 2018
    Square edged woodfibre boards are readily available. You'd most likely have to prime paint it first, then use a good heavy duty, ( best is ready mixed ), wallpaper adhesive. Getting a nice tight fit between the joists will be the hard bit.
    I screwed wood-fibre up into the floorboards (and just occasionally, in bare feet, I find one of the few which peeked through!), and filled any gaps with wood-fibre droppings mixed with water. I did plaster, but mix in a little wall-paper paste and it'll be fine, I expect.
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