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  1. #11
    Veteran Member GPintheMitten's Avatar
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    Sep 2009
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    Flushing, Michigan
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    Kubota B2620 with BH65 backhoe, Ford 2N

    Default

    BTW, this leanto is already built. Probably about 25 years ago. It has plywood sheathing on the roof with a steel panel roof.

    I can't add an additional rafters easily and can't build anything on top of the rafters.

    I want to safely be able to lift a max of 1000 pounds with either a chainfall or an electric motorized cable hoist.

    My research tells me that 1.25" schedule 40 pipe will be strong enough for a 24" span. I just need to determine an appropriate way to attach it and determine if some upgrade is needed for the rafters that I can afford and can do myself.

  2. #12
    Veteran Member Depmandog's Avatar
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    Nov 2010
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    Buckner MO
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    2005 Kubota L5030 GST; Farmall 706

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    I would sister the rafter all the way - wall to wall, with 1/2 ply glued and screwed in between. Then I would repeat the same on the next rafter. Finally, I would install two rows of blocking the full length on the lean to. You wouldn't have to use 2x12 for the blocking, I wouldn't use less then 2x8.

    The blocking will transfer the load onto adjacent rafters - past your pipe.

    As a "safety", string a mason line taught wall to wall at the bottom edge of a rafter. Tap a nail in as a reference point into the rafter, under the mason line. When applying a load, keep you eye on the line. If the nail separates from the line more than say 1/2"-3/4", you have reached your "pucker factor load limit"
    Dean


  3. #13
    Super Member radioman's Avatar
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    May 2008
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    5,692
    Location
    Ontario, NY
    Tractor
    Kubota BX24

    Default Re: Support for Chainfall.

    I agree - sister it all the way. if you dont- you are just adding more dead weight. blocking is a great idea - similar to building a beam to go across a few rafters.

  4. #14
    Elite Member
    Join Date
    Jul 2009
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    4,876
    Location
    SW WA
    Tractor
    Kubota BX2360

    Default Re: Support for Chainfall.

    you could get one of these, and use it other places when needed.

    1 Ton Telescoping Gantry Crane



    For reinforced wood beams, here is some good reading:
    Structural Design in Wood - Judith J. Stalnaker, Ernest C. Harris - Google Books

    Bruce

  5. #15
    Veteran Member GPintheMitten's Avatar
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    Sep 2009
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    Location
    Flushing, Michigan
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    Kubota B2620 with BH65 backhoe, Ford 2N

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    Quote Originally Posted by Depmandog View Post
    I would sister the rafter all the way - wall to wall, with 1/2 ply glued and screwed in between. Then I would repeat the same on the next rafter. Finally, I would install two rows of blocking the full length on the lean to. You wouldn't have to use 2x12 for the blocking, I wouldn't use less then 2x8.

    The blocking will transfer the load onto adjacent rafters - past your pipe.

    As a "safety", string a mason line taught wall to wall at the bottom edge of a rafter. Tap a nail in as a reference point into the rafter, under the mason line. When applying a load, keep you eye on the line. If the nail separates from the line more than say 1/2"-3/4", you have reached your "pucker factor load limit"
    Ok, what you say makes sense. I'll do it the way you suggested. Thanks very much.

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