How to dig a footing for floor joist support???

Discussion in 'Misc DIY' started by Richard Holliingsworth, May 20, 2004.

  1. Hello:

    In restoring my wood flooring, I found a rotten spot around the
    fireplace. I cut out the rotten flooring, subflooring and then found
    rot in the floor joists that were touching the masonary of the fireplace.

    I plan to cut off all the rot, cripple on a 2x10 and connect it to the
    rim joist with joist hangers on both sides of the fireplace. That will
    shure up those two joists.

    The problem is that there is a cross beam (2 2x10s nailed together)
    between these two joists so that the other floor joists can be hung.
    Since there is also rot on this cross beam, I need to replace them
    also. It has been suggested that I place a support under the new cross
    member to act as additional support, so I need to build a footing for
    the support(s).

    How should I build this footing pad? Can I just dig a 18 to 20" hole,
    say 18" deep and fill it with quickqrete? Would that be strong enough?

    What about just laying a 2 foot steel plate flat on the ground and
    placing my supports on these?

    Any help would be greatly apppreciated.

    Thanks,
    Richard
     
    Richard Holliingsworth, May 20, 2004
    #1
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  2. Richard Holliingsworth

    m Ransley Guest

    A plate may work or settle or bend , concrete will be best.
     
    m Ransley, May 20, 2004
    #2
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  3. Richard Holliingsworth

    SLQ Guest

    According to a recent episode of Fix this old House, the foundation footing
    should be 2' x 2' square. 2' deep. They also reccomend bringing it above
    the surface of the current floor 2" to 4". IIRC they did use quickcrete,
    but I would double check that because it does not have the compressive (load
    bearing) strength of other types concrete. Adding a steel plate would be
    good as it will prevent moisture from wicking up the concrete into the wood.
    I plan to do this myself for some failing wood supports on an outdoor deck.

    Your other alternative would be to use the metal support columns with the
    screws to adjust the height, $20-40. These seem to be acceptable by code
    for support as long as they are on concrete and not wood.
    --
    Nothing Remains the Same-SLQ

    "Richard Holliingsworth" <> wrote in message
    news:...
    > Hello:
    >
    > In restoring my wood flooring, I found a rotten spot around the
    > fireplace. I cut out the rotten flooring, subflooring and then found
    > rot in the floor joists that were touching the masonary of the fireplace.
    >
    > I plan to cut off all the rot, cripple on a 2x10 and connect it to the
    > rim joist with joist hangers on both sides of the fireplace. That will
    > shure up those two joists.
    >
    > The problem is that there is a cross beam (2 2x10s nailed together)
    > between these two joists so that the other floor joists can be hung.
    > Since there is also rot on this cross beam, I need to replace them
    > also. It has been suggested that I place a support under the new cross
    > member to act as additional support, so I need to build a footing for
    > the support(s).
    >
    > How should I build this footing pad? Can I just dig a 18 to 20" hole,
    > say 18" deep and fill it with quickqrete? Would that be strong enough?
    >
    > What about just laying a 2 foot steel plate flat on the ground and
    > placing my supports on these?
    >
    > Any help would be greatly apppreciated.
    >
    > Thanks,
    > Richard
    >
     
    SLQ, May 20, 2004
    #3
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