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FeloniousFunk t1_ixzyz1c wrote

Hilarious. You absolutely can and it’s carpentry 101. /r/DIY, you should be ashamed of yourselves for lying to OP.

OP, this is structural work and you should fully educate yourself on what can go wrong before attempting this but it’s not a big deal. Shore up the joist with a vertical 2x4 to prevent sag when you cut the joist and use hangers on the new header (joist than runs perpendicular). Sistering the adjacent joists is an option but not every case, that’s the only thing that would cost a bit.

https://codes.iccsafe.org/s/IRC2015/chapter-5-floors/IRC2015-Pt03-Ch05-SecR502.10

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ten-million t1_iy073fv wrote

I think I would sister the first and third joist and head off the second. Not too big of a job depending on stuff we can’t see. Pretty common job. I get the impression the OP is willing to spend the money to do this.

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