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    fg19537's Avatar
    fg19537 Posts: 17, Reputation: 1
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    #1

    Dec 6, 2008, 12:55 PM
    I beam for attached car port
    I would like to build an attached car port to my house, but would like only 2 poles to support opposite the house. Could I use an I beam to support a 25 to 30 foot length? (with tar shingle roof).

    Thank you
    KBC's Avatar
    KBC Posts: 2,550, Reputation: 487
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    #2

    Dec 6, 2008, 03:34 PM

    What is the rafter alignment,is the gable resting in the beam or the rafter ends?Is this a lean-to type roof?(shed)

    And what purpose are the 2 posts?Instead of a stud wall?

    Back to you.
    fg19537's Avatar
    fg19537 Posts: 17, Reputation: 1
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    #3

    Dec 7, 2008, 12:05 PM
    Quote Originally Posted by KBC View Post
    What is the rafter alignment,is the gable resting in the beam or the rafter ends?Is this a lean-to type roof?(shed)

    And what purpose are the 2 posts?Instead of a stud wall?

    Back to you.
    Lean to off the side of a ranch style house. I imagine a beam lag bolted high on the side of the house, rafters pitching down to the I beam. I am trying to eliminate the need for a lot of posts because I am going to have to plow snow between the posts.

    Thank you for your response.
    KBC's Avatar
    KBC Posts: 2,550, Reputation: 487
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    #4

    Dec 7, 2008, 12:30 PM

    OK,thank you for the added info.

    If you are concerned about snow removal,are you prepared for the expense of an engineered beam(pre-lam),or something similar?

    How much does the open spacing mean to you?

    A third post,or forth for that matter,would make it a lot more cost effective,and you could do it with standard 2X lumber,rather than expensive pre-lams or an I-beam.

    Maybe a solution you can accept?
    fg19537's Avatar
    fg19537 Posts: 17, Reputation: 1
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    #5

    Dec 7, 2008, 12:53 PM
    Quote Originally Posted by KBC View Post
    OK,thank you for the added info.

    If you are concerned about snow removal,are you prepared for the expense of an engineered beam(pre-lam),or something similar?

    How much does the open spacing mean to you?

    A third post,or forth for that matter,would make it a lot more cost effective,and you could do it with standard 2X lumber,rather than expensive pre-lams or an I-beam.

    Maybe a solution you can accept?
    It would depend on the cost of the I beam. Are we talking $1000, $2000? The way you are answering makes me think you think it can be done. Do you think the I beam could take
    The weight between 2 post?

    Thank you
    KBC's Avatar
    KBC Posts: 2,550, Reputation: 487
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    #6

    Dec 7, 2008, 01:16 PM

    While I am not a structural engineer,I can say,an I-beam(not knowing specific size) would do any length you require.

    Bridges and spans of this sort are suspended for upwards of 200' with I-beams,those are very large beams!

    The deflection on this span may or may not be a problem,but the cost might be prohibitive.

    If you could put additional posts in,I believe you would save a considerable amount of money and effort(Ever tried to lift 30' of I-beam?)

    If you are sure this is what you want,I suggest contacting a metal supplier(posts should be metal and be able to withstand the I-beam weight in combination with the decking/shingles)

    And contact your local building inspector for code requirements.Plus a structural engineer for specifics on this project.

    Sorry,not an easy solution.
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