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using floor joists i already have with extra wide center beam to complete a span

chadwi | Posted in Code Questions on September 16, 2020 08:59pm

exterior home dimensions on a partial 2 story house on cinder block foundation.
i need to completely raise home and replace all basement floor joists, sill plate and rim joists.
*** I have a certified company doing the actual raising part so no worries about that
so my code question is as follows:

the complete span i have is 28′ to the outside of the cinder block, if i use 2×8 treated lumber for the sill can I use 26′ standard 2×10 lumber on 16″ spacing for the floor joists if i meet the 3″ minimum requirement for surface of each joist resting on cinder block “effectively making the span 26’6″ from inside the basement with 3″ overhang of joists onto the sill included” and then sistering enough 2×10 lumber to make the center support beam atleast 6″ thick effectively making the span 26′? so each side of the 26′ joist would be 13′ which is ok by code. do i need to cut each 26′ joist in half and use hangers on the main beam or can i simply put the main beam under the middle of the 26′ joists and call it a day? “yes i would have to notch out the foundation to do it this way versus the main beam resting on the sill” i would double up the rim joists to meet the exterior foundation aswell”  i would be using 1 piece adjustable steel support jacks every 6′ along the length of the main beam which as i understand is allowed anchoring them with 4 stainless steel bolts into the concrete floor and 4 bolts into the above main 2×10 wood beam.  reason im using 26′ 2×10 is i got them 2 years ago and obviously using what i have already is much cheaper purchasing new. BTW this is in wisconsin.
Thank you

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  1. User avater
    sawdust_steve | Sep 17, 2020 08:59am | #1

    Gee wiz. Go to a lumber yard and their joist suppliers will give you all of this information and even engineer a system for you free of charge as long as you buy the material from them.

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