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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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    • CommentAuthordelprado
    • CommentTime4 days ago
     
    Has anyone ever supported all first floors, then chopped joists back, installed a wall plate all the way along the wall with is thermally broken from the wall and then use joists hangers all the way along the wall plate like the photo below? Doesnt strike me as that hard to do

    https://www.greenbuildingstore.co.uk/lower-royd-radical-retrofit-windows-first-floor-extension/
    • CommentAuthortony
    • CommentTime4 days ago
     
    Debby dale is closest but bolts are thermal bridges
    • CommentAuthorgravelld
    • CommentTime4 days ago
     
    Only required in an IWI retrofit though right (as Lower Royd is). So goes without saying, but EWI if you can.
    • CommentAuthorgyrogear
    • CommentTime4 days ago edited
     
    "hangers and wall plates, similar to those used at Denby Dale, which are bolted through to the outside wall."

    except that in the example cited, the wall plate does not look like it is "bolted through the wall", but simply nailed into it; the entire weight of the floor thus bean supported by a few wire nails; (NTIAASOASPOC)*


    *(not that I am any sort of a structural person of course...)

    gg
    •  
      CommentAuthordjh
    • CommentTime4 days ago edited
     
    Posted By: gyrogear"hangers and wall plates, similar to those used at Denby Dale, which are bolted through to the outside wall."

    except that in the example cited, the wall plate does not look like it is "bolted through the wall", but simply nailed into it; the entire weight of the floor thus bean supported by a few wire nails; (NTIAASOASPOC)*

    You need to find a better optician!

    They are quite clearly the heads* of some fairly substantial bolts, as they would need to be given the standoff of the compacfoam. I'd lay money at 1000:1 that they were signed off by a structural engineer, given GBS involvement. What interested me was the description being bolted THROUGH rather than TO the external wall, which implies some very long bolts and large washers on the other side.

    You're not confusing the bolts with the nails holding the joist hangers to the ledger beams are you?

    * or nuts

    I don't understand why they describe the ledger beams as 'wall plates' though. Wall plates sit on top of walls to give a place to mount the roof.

    The blog doesn't say they were pre-existing joists that were chopped short, either. They could well be new ones, which would be a much easier job.
    • CommentAuthorgyrogear
    • CommentTime3 days ago edited
     
    Hi, DJH, I was not referring to Denby Dale, I was talking about the example cited :

    https://www.greenbuildingstore.co.uk/wp-content/uploads/Compacfoam-in-intermediate-floor-detail-1-768x432.jpg

    they sure look like nails to me !

    (but I do agree with you about "wall plate", Ching calls it a "planar support")

    gg
    •  
      CommentAuthordjh
    • CommentTime3 days ago
     
    • CommentAuthorTimSmall
    • CommentTime3 days ago
     
    Since the joists are timber I beams, I assume it's all new. They look like bolts to me (although a pretty grainy picture). Stainless I assume...
    • CommentAuthorcjard
    • CommentTime3 days ago edited
     
    Pretty grainy? How kind.. It looks like a photo of a watercolour painting! Interesting technique though.. presumably the boltheads can then be insulated to kill the bridge
    • CommentAuthordelprado
    • CommentTime3 days ago
     
    yes exactly, just like those pins you use for say adding insulation boards.
    •  
      CommentAuthordjh
    • CommentTime3 days ago
     
    There's no sign of nuts and washers on the outside of the barn, so it'd be interesting to know where they're bolted through to.

    In our case the bolts just screw into timber that's on the warm side of the wall (though on the other side of the airtightness barrier), so no need to insulate them. Our engineer also required the bolts a lot closer together than on that picture (200 mm from memory). I don't know what the lower bolts do? I'd have thought the upper bolts would take almost all the load.
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