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  1. #1
    Join Date
    Jun 2008
    Posts
    19

    Default Sistering floor joists

    We are sistering a few 2x10 joists that support our 2nd floor bathroom to help support a cast iron clawfoot tub. We have pulled out the kitchen ceiling below (badly stained anyway) and we see that we can set the ends of the sisters up onto the top plate with the old joists on both ends of the room (spans 13').

    The problem is that old and new 2x10s are not exactly the same width, right? So is it more important that the bottom edge rests even on the top plate with the old joist, or that that top edges are level against the floor up above.

    Also, in a couple of places there is a bit of notching near the top that has to happen to help accommodate the tub drain. Should we get these new joists attached before or after the plumber replaces all the old pipe?

    Thanks in advance!

  2. #2
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Sistering floor joists

    So is it more important that the bottom edge rests even on the top plate with the old joist, or that that top edges are level against the floor up above.
    This can be easily done by placing the new joist up against the floor above and placing shims under these joists where they rest on the wall plates.

    in a couple of places there is a bit of notching near the top that has to happen to help accommodate the tub drain.
    Notching for plumbing always makes me shudder.
    There are specific guidelines regarding notching floor joists and it's critical this is done properly.
    If at all possible consider routing the plumbing in another direction to avoid notching.


    Should we get these new joists attached before or after the plumber replaces all the old pipe?
    This may depend on how easy it would be to get the new joist in place after the plumbing is done ..... it might be simpler to install them before hand.


    Hope this helps.
    "" an ounce of perception -- a pound of obscure "
    - Rush

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