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

How To Reinforce This Floor Joist?

Discussion in 'Building' started by Spuggy, 24 Jul 2018.

  1. Spuggy

    Spuggy

    Joined:
    14 Nov 2008
    Messages:
    78
    Thanks Received:
    1
    Location:
    Cornwall
    Country:
    United Kingdom
    Hi,

    Another joist problem in our 1950's house.

    Pulled down fibreboard and taped ceiling to replace with boards and found this split and knot in the first joist. The split is about 1m from the end. It runs over, but doesn't sit on the wall in the pic (and the wall is coming down anyway). No movement can be seen with weight moving about above (daughter's bedroom), but it kicks up about 5mm from this point as it enters the cavity.

    Because it runs alongside a supporting wall, I'll struggle to sister and bolt it. Any ideas?

    Cheers.

    20180724_103019.jpg
     
  2. Sponsored Links
  3. Ian H

    Ian H

    Joined:
    14 Sep 2010
    Messages:
    7,037
    Thanks Received:
    859
    Location:
    Rochdale
    Country:
    United Kingdom
    Double/triple it up once the wall has gone?
     
  4. geraldthehamster

    geraldthehamster

    Joined:
    7 Feb 2010
    Messages:
    2,973
    Thanks Received:
    320
    Country:
    United Kingdom
    I'd be inclined not to worry too much about it. Does the supporting wall alongside it continue in the upper room? If so there won't be a lot of jumping about on it.

    If you are worried, maybe you could drill right through it into the supporting wall, and resin in some studs?
     
  5. ^woody^

    ^woody^

    Joined:
    3 Sep 2006
    Messages:
    34,019
    Thanks Received:
    4,618
    Location:
    West Mids
    Country:
    United Kingdom
    Nope, can't see a problem. Is it that big knot?
     
  6. geraldthehamster

    geraldthehamster

    Joined:
    7 Feb 2010
    Messages:
    2,973
    Thanks Received:
    320
    Country:
    United Kingdom
    It looks like a big knot with a shake above it. The timber has probably flexed marginally at the knot.
     
  7. Sponsored Links
  8. Spuggy

    Spuggy

    Joined:
    14 Nov 2008
    Messages:
    78
    Thanks Received:
    1
    Location:
    Cornwall
    Country:
    United Kingdom
    Yes, it starts kicking up from the knot until it enters the cavity about 1m off to the left of the pic.
     
  9. tony1851

    tony1851

    Joined:
    23 Feb 2012
    Messages:
    10,349
    Thanks Received:
    1,566
    Location:
    Manchester
    Country:
    United Kingdom
    Not really a problem; timber is graded and factors of safety are inbuilt into the strength assumptions. Knots are allowed for.
     
    • Thanks Thanks x 1
  10. oldbutnotdead

    oldbutnotdead

    Joined:
    11 Jan 2013
    Messages:
    4,538
    Thanks Received:
    944
    Location:
    Durham
    Country:
    United Kingdom
    You could use a nail repair plate if you're worried or get a lump of plate steel and some coachscrews and do it that way. But as long as you're not putting the team bath on top of it it'll be fine
     
    • Thanks Thanks x 1
  11. martygturner

    martygturner

    Joined:
    25 Jan 2010
    Messages:
    9
    Thanks Received:
    1
    Location:
    Bristol
    Country:
    United Kingdom
    looks like 6x2 so polyurethane glue and coach screw a 5x2 along its length, stitch the screws at 100mm centres top 1/3rd bottom 1/3rd alternating ... 6x90 screwfix jobs are fine. £20 quid all in.
     
    • Like Like x 1
  12. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page