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Hollow Core & RSJ

  • 26-11-2007 11:11am
    #1
    Ted10
    Closed Accounts Posts: 58 ✭✭


    I've been told I need an RSJ and a steel hanger to support the hollow core first floor. Is this something the hollow core fitters will install for me or do I need to have some one fit them myself (blocklayers ?). Very green about this process so any advice appreciated.


Comments

  • #2
    whitelightrider
    Registered Users, Registered Users 2 Posts: 3,100 ✭✭✭whitelightrider


    Ted10 wrote: »
    I've been told I need an RSJ and a steel hanger to support the hollow core first floor. Is this something the hollow core fitters will install for me or do I need to have some one fit them myself (blocklayers ?). Very green about this process so any advice appreciated.

    Hiya Ted. Ive just been through this as we're waiting on our hollowcore. My blocklayers installed this for me when they were blocklaying to first floor level.


  • #3
    Ted10
    Closed Accounts Posts: 58 ✭✭Ted10


    Thanks for the reply, that's what I thought but the hollow core crowd said they deliver the RSJ & hanger with the hollow core. I can't figure how they'd expect to have them fitted while the crane waited to unload the hollow core. What if it was a bad day etc. or the blockies didn't show up. Maybe I better talk to the company again and have the RSJ on site for fitting well before the hollow core is due to be laid.


  • #4
    muffler
    Registered Users, Registered Users 2 Posts: 46,545 ✭✭✭✭muffler


    You can do it either way - well depending on the firm involved. Most of them will supply and fit the slabs and RSJ's but you would have to have someone there when they are being delivered. A couple of minutes will put the RSJ in place.

    It is better practice however to have the steel in place beforehand as you need to ensure that the girders are supported on to padstones so you can get the steel yourself and get the brickies to fit it - drawback with this is that they will need to know "precisely" where to put the RSJs as it could affect the slabs when they arrive later.


  • #5
    archtech
    Registered Users, Registered Users 2 Posts: 1,046 ✭✭✭archtech


    muffler wrote: »
    drawback with this is that they will need to know "precisely" where to put the RSJs as it could affect the slabs when they arrive later.

    Most precast/hollowcore flooring suppliers supply an arrangement drawing in advance of deliver indicating the location and detail of the slabs and RSJs, so there shouldn't be an issue in locating the RSJs assuming the standard of workmanship is up to scratch.


  • #6
    Mellor
    Registered Users, Registered Users 2 Posts: 39,900 ✭✭✭✭Mellor


    to be fair, thats a pretty bit assumption.
    Take an RSJ that is spanning from the end of two wall, where they both turn away from the span. Say the walls are each 12m long. the tolerance in a 12m wall is quite large, and the wall could easily vary by 25mm, the RSJ is now out by 12mm, and this could easily result in the slab not having enough bearing.


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  • #7
    muffler
    Registered Users, Registered Users 2 Posts: 46,545 ✭✭✭✭muffler


    Mellor wrote: »
    to be fair, thats a pretty bit assumption.
    Take an RSJ that is spanning from the end of two wall, where they both turn away from the span. Say the walls are each 12m long. the tolerance in a 12m wall is quite large, and the wall could easily vary by 25mm, the RSJ is now out by 12mm, and this could easily result in the slab not having enough bearing.
    Thats the way i see it also.
    archtech wrote: »
    Most precast/hollowcore flooring suppliers supply an arrangement drawing in advance of deliver indicating the location and detail of the slabs and RSJs, so there shouldn't be an issue in locating the RSJs assuming the standard of workmanship is up to scratch.
    The drawing is one thing but it does still need measured on site. That is why I said "they will need to know "precisely" where to put the RSJs as it could affect the slabs when they arrive later."

    The brickies will need to know where to put the RSJs and measure the span first to ensure the correct length and then it needs measured again for the slabs.

    How often have you seen the blockwork/walls built "precisely" as per plan?


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