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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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  1.  
    Hello all, long time no visit the GBF.

    We are just starting a new Barn Conversion project.
    I would appreciate some advice on various issues as it progresses...

    The walls are 500mm thick sandstone.
    There is a badly created window opening put in approx 1960's with a concrete lintel on the outside face and one on the inside face, with bits of timber in between (now rotten).

    We have replaced the outside lintel with a dressed stone lintel to match the original lintels over the doors.
    In the process of tidying up the badly created opening the window will be very slightly wider, which we have allowed for with the size of the stone lintel (150mm overlap on each end)

    What sort of lintel should we install to replace the rest of the bodge job with?

    The stone lintel is 130mm thick/deep so there is approx 370mm of wall thickness to support and then finish off internally with some insulation and plasterboard.

    The length of the lintel is 1800mm (1500mm wide window opening once all tidied up and plumb!)

    A single Catnic type steel lintel of the closest size suitable (heavy duty? extra heavy duty?) or several concrete ones side by side to fill the wall thickness?

    Any thoughts anyone?
    • CommentAuthortony
    • CommentTime3 days ago
     
    Prestressed concrete for me then lots of insulation that will also mitigate the thermal bridges, the new ones on the inside could go slightly higher up to hello with this

    How are you insulating the building?
    • CommentAuthorDarylP
    • CommentTime3 days ago
     
    Catnic 'box' lintel.....cuttable, moveable.......
  2.  
    Internal insulation unfortunately. Looking at about 100mm of Kingspan/Celotex/Recticel/Quinntherm then Plasterboard.
  3.  
    a Catnic Lintel like this would almost span the remaining wall depth:
      wide lintel.JPG
  4.  
    not sure if that bit of insulation would do much? Maybe I could squirt expanding foam in to fill the whole thing?
  5.  
    Just had a measure up and the remaining depth is 350/360mm so that picture above could be a good solution.

    I had thought of using concrete but then would I have to use 2 or 3 to fill the wall depth? They only seem to be 100 to 140mm thick. They could indeed go higher up in the wall then I could insulate underneath to meet up with the back of the window.
  6.  
    Dominic,

    (a) Welcome back!

    (b) Please forgive me answering a Q you didn't ask, but re the IWI, are you parge-coating the stone first?
  7.  
    Whats wrong with using stone. Machine square cut its as cheap as chips its only when you want hand dressed stone it starts to get expensive. Fortunately the conservation officer has insisted that all our replacement mullions and lintels are machine cut so that it can be distinguished from the original.
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