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Re: Joist Sizing [Re: TIMBEAL] #25126 01/11/11 02:34 PM
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Jim Rogers Online Confused
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Originally Posted By: TIMBEAL
What is the rule for pocket depth?


At the class I took at Heartwood school where they taught us beam sizing and other engineering stuff, they gave us this rule of thumb for floor joist to sill beam situation:



We also learned that you should size the joist first and then size the timbers to hold up the joist next. And work you way down to the foundation, making timbers large enough to hold everything up properly.

If that is the case, then maybe the sills in this extended frame will have to be deeper to be stronger.

As I mentioned just adding a supporting sleeper under the middle may solve the problem without changing a lot of joints and beam sizes.

Like this:



He would just have to make it so his foundation would support the ends and add a pier to the middle.

Jim Rogers


Whatever you do, have fun doing it!
Re: Joist Sizing #25127 01/11/11 02:43 PM
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Paul Freeman Offline
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That's perfect! Notice the "scooped" out notch, that's exactly what we do to avoid the whole horizontal shear issue. If you run the calcs for square joist notches there's no way that would work on your longer spans, but the gradual transition works great.

But, if you add the midgirt like you show in teh picture it won't be an issue anyway, unless the floor load was very high because you're bringing in a tractor something.

Nice examples, thanks Jim (and Tim!)

Re: Joist Sizing #25132 01/12/11 02:02 AM
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Andre L Offline OP
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I like the sleeper idea, I'm gonna run with that one. I won't be bringing in any tractors!

Thanks for all the help!

Re: Joist Sizing #25134 01/12/11 02:15 AM
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Paul Freeman Offline
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Make sure you size it right, a support in the middle would help significantly.

Re: Joist Sizing #25135 01/12/11 04:32 AM
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Dave Shepard Offline
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I'll be using two sleepers to support the threshing floor in my current project, as the span is almost 10'. The sleepers in turn will be supported by three Samson beams, as they are about 45' long.


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