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Flat channel ducting through flat roof joist

Discussion in 'Roofing and Guttering' started by DerMitchie, 26 Jan 2021.

  1. DerMitchie

    DerMitchie

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    22 Jan 2021
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    I have a simple question, to which I have been getting conflicting answers:

    Can I cut a section out of a flat roof joist to run through some ducting? Happy for it to be flat channel. The rafters are 170mm.

    I've seen some info but think it's about floor boards:

    [​IMG]

    I have seen enforcement plates, but only from the US.

    [​IMG]

    One challenge is that the joist is only approx. 400mm long.
     
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