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Floor Joists replacement options

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  • #1

    Floor Joists replacement options

    I have a question about floor joists. I have 12" engineered wooden I beam joists on 16" center above my ceiling. Has anyone replaced a few of these to maximize height in their space? I would think that a 4" steel I beam would be as strong and give me a lot more clearance. Has anyone had experience with this?
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  • #2
    I would recommend having some contractors come out to give you a quote for the job. That way you can pick their brain and make sure they're meeting the code standards for your area.

    Comment

    • fortner28
      #2.1
      fortner28 commented
      01-14-2021, 05:10 PM
      Editing a comment
      I will definitely do that. I will probably have an engineer certify things as well. I was just curious to see if any people have gone through the process. There are variables such as span and load that make every situation a bit different.
  • #3
    I did that with a structural engineer...but has 2x6 sandwiched on either side of my 2x10...then trimmed to match the width of the 2x6 to pick up a few inches. Definitely work with an engineer to come up with the plans.

    Comment

    • fortner28
      #3.1
      fortner28 commented
      01-14-2021, 07:29 PM
      Editing a comment
      Did you look at steel as an option? From the calculation I find it looks like a 4" steel I beam is stronger than the joists I want to replace. Of course steel costs a good deal more.
    • Holtzeeeeee
      #3.2
      Holtzeeeeee commented
      01-15-2021, 02:02 PM
      Editing a comment
      Yeah he brought that up but to your point would have been exponentially more in cost for two inches of additional height.
  • #4
    I replaced a couple in my garage. Because it was structural “legally” I had to have plans from a structural engineer, and a permit. The cost from the engineer was a few hundred. I took out 2 joists for an 8 foot span, and was able to raise the ceiling a couple feet. It was totally worth it.

    Comment

    • #5
      Originally posted by fortner28 View Post
      I have a question about floor joists. I have 12" engineered wooden I beam joists on 16" center above my ceiling. Has anyone replaced a few of these to maximize height in their space? I would think that a 4" steel I beam would be as strong and give me a lot more clearance. Has anyone had experience with this?
      Depending on span you'd better with LVL
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      Comment

      • fortner28
        #5.1
        fortner28 commented
        01-15-2021, 08:36 PM
        Editing a comment
        I think the smallest LVL beam is 7.5 inches. This would gain 4". I was really hoping to gain at least 6". I will have to figure out how much the extra space is worth.
      • mthunt
        #5.2
        mthunt commented
        01-15-2021, 09:24 PM
        Editing a comment
        Depending on the span you can trim 2 inches off of the LVL. I’ve done it.
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