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Replacing long joists in garage roof

Discussion in 'Wood / Woodwork / Carpentry' started by JayDiy, 28 Aug 2017.

  1. JayDiy

    JayDiy

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    Hi all I have a garage with flat roof neglected for years hence the joists are rotting away, I need to replace them but only problem is these joists are 5.3 metres long! I've not seen any timber this long anywhere, longest is 4.2 metres so I was wondering is it possible to join two 3 metre joists together to create one long piece? Would it sag? Would it buckle? Would it be strong enough? Btw the garage dimensions are 5.3m x 7.1m. Also the 18mm ply would all need to be replaced and covered with roof paint and fibreglass. It's gonna be expensive I guess but it's got to be done. Would appreciate any advice.
     
  2. foxhole

    foxhole

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    6m timber readily available.
    EPDM would be a cheaper easier diy option.
    What's roof paint?
     
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  3. JayDiy

    JayDiy

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    Byroof paint I meant the top coat after resin fibreglassetc is applied which comes in various colours. Sorry what's EPDM, how is it applied?
     
  4. foxhole

    foxhole

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    Google it or YouTube , lots of vids, rubber sheet , one piece , glued to ply. 40+ year life.
     
  5. Any good woodyard will supply those timbers, but no, you couldn't join 2 timbers together. And thanks Foxhole, I checked Youtube, and it was damned impressive; looking at it, it's much easier than fibreglass.

    It also looks as though they are using OSB, which should be cheaper than ply.
     
  6. DIYnot Local

    DIYnot Local

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