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I am going to be replacing the subfloor in a room, but just noticed that the exiting joists at the end wall (room getting new subfloor is a dining room, room next to it is a bathroom) end at unfortunate spots. The wall is just about in the middle of the floor between these two joists, which means I either have to demo the bathroom or end the subfloor a foot earlier than I want.

So, my question: can I use a 14’ (I am able to add a post at about 9’) 2x6 (because of space restrictions) to act as the end joist for a new subfloor? I could double them up, but anything larger than 2x6 will not fit.

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  • Are you saying you are going to span 9’ with a 2x6 as a floor joists?
    – Ed Beal
    Apr 10, 2022 at 3:16
  • Yes, sorry. 9’ and 5’ I guess
    – Dave Johnson
    Apr 10, 2022 at 3:39
  • I answered for a 2x6 joist, but if you are asking for rim joists, beams or girder you'd have to provide a sketch with dimensions and location of support points.
    – P2000
    Apr 10, 2022 at 4:22
  • Does the new post being added have footing?
    – Lee Sam
    Apr 10, 2022 at 4:32
  • @LeeSam no, no footing over here
    – Dave Johnson
    Apr 10, 2022 at 12:47

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You can use 2x6 for a 9' span, if the joists are spaced 16" OC.

Ref: https://www.mycarpentry.com/joist-span-table.html

enter image description here

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  • Nice chart easy to understand.
    – Lee Sam
    Apr 10, 2022 at 16:58

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