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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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    • CommentAuthordickster
    • CommentTimeSep 21st 2021
     
    So, I built the frame for my solar panels out of the metric equivalent of 2x3s and 2x4"s, planed all round (3 years ago), timber kept dry and of good straight quality. Lovely job.

    Used coach bolts to join lapped joints (and orange glue and mudguard washers).

    I was taking down some bunting after our spate of family and friends summer parties and noticed a bolt which I had missed and hadn't tightened. (Unusual for Mr Pedantic).

    Turns out that they were all loose, not even finger tight. A quick spanner sorted it, but was it shrinkage or thermal cycling that was/is the culprit?

    Best check the shed next!
  1.  
    Dry summer I think.

    I put up a load of south-facing 115mm shiplap cladding in the Spring and painted over it. The boards have shrunk and now there's a 2mm unpainted line visible beneath each overlap, so they shrunk about 2/115 = ~2%. Maybe they will take up again over Winter.

    If your 50mm timbers shrank the same amount 2%, the bolts will be slack by about 1mm, or say one turn of the nuts.

    Ditto if we built a timber frame house or wooden boat. There's a lot to be said for using wooden dowels.
    •  
      CommentAuthorfostertom
    • CommentTimeSep 21st 2021
     
    Shrinkage, surely - carpentry timber is as 'young' as suppliers can get away with. Your outdoor framing, by definition in sunny location, couldn't be better exposed to rapid 'seasoning' aka drying/shrinking. By thermal cycling, you mean repeated tensioning/relaxing of the bolts, leasing to tiny rotation of nuts ea time? Given that shrinkage will be going on as well, it's unlikely that much if any of the tensioning phase could continue for long.
    • CommentAuthortychwarel
    • CommentTimeSep 21st 2021
     
    That's why you should use nylock nuts, then at least when they are a little slack they cant actually undo.
    • CommentAuthordickster
    • CommentTimeSep 22nd 2021
     
    Thanks to all,

    Fostertom, I think you've hit the nail on the head, can't move nut counterclockwise, but shrinkage leaving it high and dry.

    I don't like nylocks, fiddly blighters, especially when you can't be bothered to use the right spanner for the job.

    Lovely Indian summer down here:)
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