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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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    • CommentAuthordereke
    • CommentTimeJul 19th 2017
     
    For my timber framed (100x47 + 100mm EWI) garden office I am having a 3m wide bifold door.

    I obviously need a lintel of some description for this. It will be supporting a roof on a 4degree pitch built with joists/insulation and sheet metal roofing.

    Will a couple of lengths of 225x47 be sufficient or should I get a steel lintel? If so what steel lintels are there for timber frames - I see a lot for timber frames with a cavity and brick but nothing for timber frame, EWI and timber cladding.
    •  
      CommentAuthordjh
    • CommentTimeJul 19th 2017
     
    I can't answer your question directly. I expect the span tables can tell you; just make sure that you allow enough clearance above the door so that when the lintel is deflected downward a bit by the roof load, it doesn't compress the door. If the tables show that you need a deeper beam than you would like then you could consider a flitch beam (i.e. two thin wooden beams bolted either side of a steel plate, typically 10 mm steel). They are stiffer but still allow timber to timber fastenings. You do have to consider thermal bridging to avoid cold spots.
  1.  
    We have a similar sized lintel that is 150 (made up of 3 x 50) x 200 mm timber lintel for such a span.
    • CommentAuthorgoodevans
    • CommentTimeJul 20th 2017
     
    Check your bi-fold door make-up - I've been looking at one company - their wood framed bi-folds are hung from the top (i.e. the lintel has to take the load of the glass etc) - their aluminium bi folds support the glass at the bottom. It makes a big difference to the loading on the lintel or floor.
    • CommentAuthordereke
    • CommentTimeJul 20th 2017
     
    @djh thank you - I didn't know about flitch beams that sounds like a good option.
    And I think I better do some roof load calculations after all.

    @ComeOnPilgrim interesting - what sort of structure was this supporting above?

    @goodevans I hadn't though about top hung bifolds you are right that would make a big difference.
  2.  
    Ours is a house, so carrying much more on top. Though it also carries our top hung bifolding doors that are triple glazed and incredibly heavy.
    •  
      CommentAuthordjh
    • CommentTimeJul 20th 2017
     
    Posted By: derekeAnd I think I better do some roof load calculations after all.

    I believe you'll need an engineer's sign-off on the beam design.
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