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Which joists?

Discussion in 'Wood / Woodwork / Carpentry' started by Faye C-Davis, 31 Jul 2017.

  1. Faye C-Davis

    Faye C-Davis

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    Hi all. We are having an double extension and the architect has stipulated that the floor joists need to be 63 x 170mm C24. The length will be just over 4m. Spaced at 400mm over a 10m space.
    I am really struggling to find this specific size of timber anywhere.
    I have been looking at the option of open/metal web joists but have not yet gone as far as getting a quote.
    Does anyone have any experience with anything I have written? If so any advice would be greatly appreciated

    Thanks,

    Faye
     
  2. freddiemercurystwin

    freddiemercurystwin

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    Just use slightly larger joists that are readily available.
     
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  4. foxhole

    foxhole

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    Architects should have stipulated "or equivalent" they seems to have little knowledge of stock timber sizes.
     
  5. Mr Chibs

    Mr Chibs

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    The figures you have are probably what you've been given, from the Trada tables (span tables).
    63x170 c24 gives a span of 4.19 Metres @ 400 centres.
    With 75x170 c24 timber this span would be 4.43M, so this should be suitable and easy to find.

    47x195 = 4.36m
    These are in the 0.25 to .50 dead load column
     
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