1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Notches over holes?

Discussion in 'Plumbing and Central Heating' started by Starship_Toby, 27 Feb 2020.

  1. Starship_Toby

    Starship_Toby

    Joined:
    27 Feb 2020
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi,

    Just a quick question regarding notches in floor joists...

    My plumber plans to run pipes in the floor joists above existing holes where the electrics run. As shown in the photo. Is this acceptable?

    I’m certainly no expert in anything DIY but something told me it’s not right.

    Hopefully I’m probably panicking about nothing!
     

    Attached Files:

  2. Sponsored Links
  3. John D v2.0

    John D v2.0

    Joined:
    26 Aug 2016
    Messages:
    6,315
    Thanks Received:
    876
    Country:
    United Kingdom
    Not really, but your house is unlikely to fall down, most likely is the odd extra crack in the ceiling below and heavier noises from footsteps etc through the floor
     
  4. lostinthelight

    lostinthelight

    Joined:
    11 Feb 2016
    Messages:
    2,600
    Thanks Received:
    480
    Location:
    monmouthshire
    Country:
    United Kingdom
    Has he,she fitted those comp elbows as well? If so it doesn't inspire confidence unless there's a good reason
     
  5. HERTS P&D

    HERTS P&D

    Joined:
    9 Apr 2010
    Messages:
    11,591
    Thanks Received:
    1,758
    Location:
    Hertfordshire
    Country:
    United Kingdom
    He ain't no plumber!

    Andy
     
  6. Buxus

    Buxus

    Joined:
    29 Aug 2015
    Messages:
    26
    Thanks Received:
    3
    Country:
    United Kingdom
    Why have isolation valves under the floor, out of interest?
     
  7. Nozzle

    Nozzle

    Joined:
    23 Dec 2012
    Messages:
    2,112
    Thanks Received:
    271
    Location:
    Suffolk
    Country:
    United Kingdom
    Is that notch in the centre of the joist or near the edge where it bears on a wall?

    Nozzle
     
  8. Madrab

    Madrab

    Joined:
    4 Oct 2012
    Messages:
    7,563
    Thanks Received:
    2,103
    Location:
    East Renfrewshire
    Country:
    United Kingdom
    hmmm... 3 issues there IMO.

    1. do not use ISO's in an area that isn't easily accessible, just asking for trouble
    2. compression fittings under a floor are not a professional approach
    3. That large a notch above an already drilled joist is a no no. Notch shouldn't be more than 1/4 the depth of the joist.

    Notches and hole are meant to be cut into different parts of a joist, holes in the centre, notches at the ends
     
  9. Madrab

    Madrab

    Joined:
    4 Oct 2012
    Messages:
    7,563
    Thanks Received:
    2,103
    Location:
    East Renfrewshire
    Country:
    United Kingdom
    Just as an addition, will your house fall down .... probably not .... will the joist fail ..... probably not. It just isn't good practice.
     
    • Like Like x 1
  10. Sponsored Links
  11. big-all

    big-all

    Joined:
    12 Jul 2004
    Messages:
    18,578
    Thanks Received:
    1,437
    Location:
    Surrey
    Country:
    United Kingdom
    what is the unsupported span under those joists if its a small span it may be less off a problem ??
     
  12. Elkato531

    Elkato531

    Joined:
    22 Jul 2009
    Messages:
    985
    Thanks Received:
    228
    Location:
    Sussex
    Country:
    United Kingdom
    I'm sure you know Madrab but max notch depth is 1/8th of joist depth. Its max hole size is 1/4
     
    • Thanks Thanks x 1
  13. Starship_Toby

    Starship_Toby

    Joined:
    27 Feb 2020
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Just to clarify on the image...

    I believe the valves are temporary. Once the room is refurbished the pipes will continue through more notches to feed radiators.

    The elbows connect on to very old pipes which I’m told are a much thicker copper.

    The notches are 45cm from the wall and the joist span is 4m.

    Thanks for the comments.
     
  14. Madrab

    Madrab

    Joined:
    4 Oct 2012
    Messages:
    7,563
    Thanks Received:
    2,103
    Location:
    East Renfrewshire
    Country:
    United Kingdom
    Oops ... yup, thanks for that ... wrong reference. :oops:
     
  15. Gasguru

    Gasguru

    Joined:
    9 Sep 2005
    Messages:
    11,789
    Thanks Received:
    3,085
    Location:
    Sussex
    Country:
    United Kingdom
    Google the building regs diagram for joist notches/holes...what you have there is a bodge and non compliant.
    Building regs aren't optional.
     
  16. big-all

    big-all

    Joined:
    12 Jul 2004
    Messages:
    18,578
    Thanks Received:
    1,437
    Location:
    Surrey
    Country:
    United Kingdom
    no redundancy to play with on a 4m span:(
    was hoping sub 3m
     
  17. jj4091

    jj4091

    Joined:
    1 Dec 2006
    Messages:
    4,950
    Thanks Received:
    452
    Location:
    Cumbria
    Country:
    United Kingdom
    You could see that sort of thing & worse in many houses. If you have concerns ask him to strengthen it with metal plates/brackets.
     
Loading...

Share This Page