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Flat roof, joists resting on timer lintel. Sizing/Span chart

Discussion in 'Building' started by cascas, 14 Dec 2012.

  1. cascas

    cascas

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    Location:
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    I am looking to build small extension wih a flat roof on the back of the garage.

    The one end of the joists (2.8m long) will be on the brick wall, whilst the other will rest on a timber lintel. The lintel will need to span 4m.

    Can anyone point me towards a span table for this for timber sizing?
     
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  3. ^woody^

    ^woody^

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    There aren't any for that use. You need to calculate a beam of timber or steel
     
  4. RonnyRaygun

    RonnyRaygun

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    As Woody says, there aren't any tables for what you require.

    Floor trimmers, yes. Purlins, yes, but not roof beams.

    I can tell you that you need either a triple 47x220 C16 beam, or a double 47x245 C16.

    However, if you intend to involve Building Control they will want to see calcs.

    http://www.broxbourne.gov.uk/PDF/BC_TRADA_SPAN_TABLES _2008.PDF
     
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