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

Joining RSJs

Discussion in 'Building Regulations and Planning Permission' started by igglepiggle3, 24 Mar 2012.

  1. igglepiggle3

    igglepiggle3

    Joined:
    24 Mar 2012
    Messages:
    1
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi.

    We are hoping to have a extension built to our home and will be requiring RSJs to be installed, at the moment we have a flat roof extension at the rear and want to build up from that.



    We have a existing steel beam in place which will need another one attached to it running towards the rear of the house and that one will then be connected to a new one running across the rear window forming an H shape if you looked down on them from above.



    SE has said that the beam connecting the two will have to be joined by the web of the existing one because of the load so will have to be boxed round under the celing height.



    This is the main thing that I did not want and wanted the joining beam to sit across the top of the other 2 in the celing void.



    Can this not be done as wouldnt the load be the same on the beam anyway?



    He should know about this as he has done our Planning And Building Regs which have both passed and I have mentioned many times that I did not want another boxed beam.


    I feel very angry at the moment as we have spent £2500 on plans and fees since this started last August and to be told yesterday afternoon that the RSJ will be below the ceiling has is not acceptable .


    Should I cancel his cheque and get another SE to sort it out as he is not doing what I want him to do?


    Any help appreciated.

    I stopped smoking in January and have never wanted one more than now!!!!
     
  2. Sponsored Links
  3. ^woody^

    ^woody^

    Joined:
    3 Sep 2006
    Messages:
    34,069
    Thanks Received:
    4,624
    Location:
    West Mids
    Country:
    United Kingdom
    It's hard to comment without knowing the layout, design or loads

    Is he a proper structural engineer?
     
  4. tony1851

    tony1851

    Joined:
    23 Feb 2012
    Messages:
    10,353
    Thanks Received:
    1,566
    Location:
    Manchester
    Country:
    United Kingdom
    Normal steelwork practice is to join beams meeting at right-angles by fixing into the web of the supporting beam. This means extra expense because it involves welding an endplate on the incoming beam, and some hole-drilling and bolting. For normal domestic loadings, though, it is usually possible to simply sit the incoming beam on top of the supporting beam without any bolting.

    However, there is an important qualification, which might be applying in your case. If the existing beam is quite slender, when considering its span, it is possible that the additional load from the incoming beam would overstress it and cause it to buckle sideways. A way to prevent this is to rigidly restrain the beam, by bolting the incoming beam into the web. If this is the case, sitting the incoming beam on top of the existing beam would not be accepted as giving adequate lateral restraint - you would only be relying on friction.

    As the previous poster said, it depends on the loadings, spans and the size of the existing beam(s). Having said that, SEs sometimes try and make life easy for themselves by not bothering to do proper figures. Ask why, and don't take this at face value.
     
  5. 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