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Help! Knocking internal bearing wall

  • 25-10-2017 12:44pm
    #1
    Corgie123
    Registered Users, Registered Users 2 Posts: 2 ✭


    Looking for advice .... is it possible to hide RSJ in the ceiling when the joists are perpendicular to the wall that's being knocked? If so, how exactly does this work?

    I understand the science of cutting into the joists and putting the beam in between them, when the joists are parrell. Not sure about the options when perpendicular though?

    This will be done by professionals, just trying to understand the options first!


Comments

  • #2
    Gumbo
    Moderators, Society & Culture Moderators Posts: 40,351 Mod ✭✭✭✭Gumbo


    What is the beam holding up if the joists are running alongside it.
    A wall upstairs?


  • #3
    Corgie123
    Registered Users, Registered Users 2 Posts: 2 ✭Corgie123


    Hi kceire. The joists are running in the opposite direction of the current wall (the one we're knocking). So the beam would also be running in the opposite direction - ie. perpendicular to the joists. We would like to have the ceiling flush and hide the beam within it, if possible!


  • #4
    Gumbo
    Moderators, Society & Culture Moderators Posts: 40,351 Mod ✭✭✭✭Gumbo


    Corgie123 wrote: »
    Hi kceire. The joists are running in the opposite direction of the current wall (the one we're knocking). So the beam would also be running in the opposite direction - ie. perpendicular to the joists. We would like to have the ceiling flush and hide the beam within it, if possible!

    Standard detail for the engineer.
    It can be sized with a plate at the bottom to catch the joists. The joists may need to be notched also.


  • #5
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    If I understand the detail correctly it’s an inverted ‘T’ beam to engs spec, propping joists each side before removing any wall.


  • #6
    James 007
    Registered Users, Registered Users 2 Posts: 962 ✭✭✭James 007


    How wide is the ope going to be. Are you sure if a beam is only required or is a full picture frame required, the loads may justify this if the ope is wide enough. This needs to be answered first.

    The next part is for the suitable construction. Assuming the beam is only required then you will need to support both the wall and the floor joists. There are several options to this, existing joists would have to be cut to suit:

    1. Use I-beam, infill web with timbers and support joists using joist hangers
    2. Use I-beam, with welded bottom plate, rebate notch out of bottom of joists.
    3. Use box section, adapt solns 1. or 2. above or angles fixed to the sides to support the joists.

    No. 1 above would be the most common option for me to use.


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