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Notching floor joists

Discussion in 'Floors, Stairs and Lofts' started by Londontennistube, 21 Jan 2021.

  1. Londontennistube

    Londontennistube

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    I'm running 15 mm copper pipe and need to go through 5 floor joists. Is there any limit on how many you can notch in a row?
     
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  3. blup

    blup

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    Only if they affect the overall structural integrity of the building.

    Blup
     
  4. JBR

    JBR

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    I'm no expert, but I suppose that the best place to run the pipes would be in holes sited half-way between the top and bottom of each joist, rather than notches in top or bottom.
     
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  5. Londontennistube

    Londontennistube

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    The trouble with that is you have to chop the pipe up into sections to pass it through the holes. With notching the whole length can go down across the 5 joints.
     
  6. JBR

    JBR

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    Oh yes of course, unless you use flexible pipes and you're installing mains wiring. Even then, I think it might be difficult to drill the holes unless you have a 90 degree attachment for the drill!
     
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  8. Londontennistube

    Londontennistube

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    It's an 8 inch x 3 inch joist and want to notched about 15 mm from the top and 30 mm wide
     
  9. denso13

    denso13

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  10. Tigercubrider

    Tigercubrider

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    Seeing as this topic comes up quite a bit, does nobody manufacture something as a solution for this?
    Thinking of pairs of steel/plastic(?) brackets that could be quickly fixed around a joist to give strength back?
     
  11. Londontennistube

    Londontennistube

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    Yes but you still have to leave the notch or hole so any plates or brackets would need to be shaped around the alterations.
     
  12. Tigercubrider

    Tigercubrider

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    Yeah- I was thinking of premade with maybe 25mm pre cut notch
     
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