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Can a timber beam be used instead of steel I beam rsj?

Discussion in 'Roofing and Guttering' started by Barry378, 1 May 2020.

  1. Barry378

    Barry378

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    Hi folks, I’m currently building a granny annex at the end of my garden, built from concrete blocks with a 100mm cavity. measuring at 7.2m deep, 5.2m wide and 2.5m high with a flat roof

    Iv been toying with the idea of bolting two roof rafters together to make a beam to hang the roof rafters from, instead of using a steel I beam RSJ. As I believe this will be more cost effective in materials and labour.
    (Beam width approximately 4.8m)

    I just wanted to know if this is a good idea or not? And if so what size timber would be most suitable?

    Would appreciate any suggestions many thanks
     
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  3. Nozzle

    Nozzle

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    Glulam beam?

    Nozzle
     
  4. noseall

    noseall

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    It would need to be hefty at that span. You'd be wrong to think it would be more cost effective too. Are we talking ridge beam here?
     
  5. catlad

    catlad

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    12x2" joists
     
  6. noseall

    noseall

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    Would a pair of those be cheaper than a steel beam?
     
  7. catlad

    catlad

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    I mean't for the whole roof, he stated a flat roof of 5.2m
     
  8. noseall

    noseall

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    I thought it was a ridge beam...:cautious: I'll leave the thread quietly..
     
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