Home  5  Books  5  GBEzine  5  News  5  HelpDesk  5  Register  5  GreenBuilding.co.uk
Not signed in (Sign In)


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.

Buy individually or both books together. Delivery is free!

powered by Surfing Waves

Vanilla 1.0.3 is a product of Lussumo. More Information: Documentation, Community Support.

Welcome to new Forum Visitors
Join the forum now and benefit from discussions with thousands of other green building fans and discounts on Green Building Press publications: Apply now.

    • 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.
    • 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.
    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.
    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.
    • 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.
Add your comments

    Username Password
  • Format comments as
The Ecobuilding Buzz
Site Map    |   Home    |   View Cart    |   Pressroom   |   Business   |   Links   

© Green Building Press