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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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    • CommentAuthorshortjedi
    • CommentTimeDec 10th 2012
     
    A quick introduction,
    About to start a new build oak framed barn. So far we've got detailed planning permission and the oak frame detailed drawings are due this week. The frame to be exposed internaly and exterior is oak weatherboarding.

    We've not finalised a build system yet and are struggeling to make a decission. So far looked at oakrights rightwall and roof system, border oak do something similar, also SIPS. Our favorite is hemcrete but our architect isn't keen on "tree hugging technology" he recomends a blockwork outer leaf with whatever insulation on the inside.

    It would be great to talk to someone who's already done similar.

    cheers Steve
    • CommentAuthorDarylP
    • CommentTimeDec 10th 2012
     
    Steve,

    We have just finished the shell of a oak-framed barn-conversion with 'PassivHaus' levels of insulation, and no CH boiler.
    Email me for the basics if you want, I would be happy to share them with you.

    Cheers,
    Daryl
    • CommentAuthorRobur
    • CommentTimeDec 10th 2012
     
    Hi Steve,

    The oak frame will shrink more than you think & vertical shrinkage is often discounted - but these factors should guide your envelope choice. Pesonally, I wouldn't consider an external masonry skin to a green oak frame as the frame could be left 'hanging' off the masonry wall or your wall ties will get torn off the frame leaving the masonry skin less than ideally restrained - you might get away with it on a single storey, 2 storeys less likely and a 2 storey gable end even less so. Flexible building = flexible skin. Design for shrinkage and then add some failsafes - and if your architect is not experienced with timber frames then consult with your framer.
    • CommentAuthorseascape
    • CommentTimeDec 11th 2012
     
    Have you spoken to the guys at hemp construct? They do a block 600x300x300 and get a u value of 0.17 I think - check this. Fire regs BRE A+ Approx £85m2 cost.

    I'm sure he said they specifically did oak frame and infill. Call them and go and see one that they have done before committing to masonary. Your architect sounds like he needs to go back to university for a refresher course.
    • CommentAuthorEd Davies
    • CommentTimeDec 11th 2012
     
    Friends did an extension (basically a one bedroom+study house, less the kitchen) by these people. This is not theirs but similar general appearance:

    http://www.welshoakframe.com/gallery/category/annexes

    Can't quite remember what the inside of the walls are: just plasterboard painted with clay paint IIRC. Then service void, OSB, hemp between studs (75 mm or more?), 80 mm or so Pavatherm+ (woodfibre board with waterproof outer layer), ventilation gap, western red cedar cladding.

    Roof is oak rafters, plasterboard, 2 x 80 mm Pavatherm, 20 mm or so of the treated Pavatex waterproof layer (Isolayer?), counter battens, battens, tiles.

    It all seemed to go together well enough and they're happy with it. It seems to me that, apart from the plasterboard, it should all be reasonably flexible to follow any movement in the oak without too much drama.
    • CommentAuthorecohome
    • CommentTimeDec 15th 2012
     
    Hi Steve, when you say an oak framed barn, do you mean an oak framed house? Otherwise why are you worrying about insulation?

    There seems to be a direct conflict between building a framed structure (& an expensive one at that) & then adding a twin leafed infill which is also capable of being structural (blockwork - or SIPS for that matter). Hemcrete (or straw bale or any other lightweight infill) seems eminently more suitable. The tree-hugging comment seems ill informed, but without more info about your build its difficult to help with the best options. An oak framed solutions really does require expert advice but there seem to be a fair few around.
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