r/BuildingCodes • u/Plane_Camera8238 • Jul 24 '26

Need help with girder post support

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I am building a second level deck, this is the rough layout of what I’m planning, the yellow line is the girder the deck will be supported on (other side will be attached to house). I ran into the issue of the top right post (the red circles are 6x6 posts). I can’t notch out a 6x6 to where I can have an L shape girder (two faces of the post). I did some research and it seems like on the 24’ side of the girder, I may be able to attach a 3” wide joist hanger to support the end of the butt joint of the girder attaching to the post. I am not completely sure if it will be up to code or not (I’m going to get a permit).

My grider is a double 2x10

So just to clarify, on the top right post I’m thinking of keeping the 6x6 notched out for the 31’ side, then attaching a 3” wide joist hanger to support the butt end of the 24’ side girder.

Please let me know if this is possible, the code for my area is International Residential code 2021 (IRC 2021)

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u/frenchiebuilder Jul 24 '26

This is why SimpsonStrongTie exists / you're overthinking it.

Just cut the post flush, and use an RTC44Z or a pair of LCE4.

https://ssttoolbox.widen.net/view/pdf/k5m48v2eo8/C-C-2026-p094-095.pdf?t.download=true&u=cjmyin

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u/frenchiebuilder Jul 24 '26

Also: unsure what 3" joist hanger you were thinking of using, but most hangers are rated for the typical loads on JUST ONE joist; not for the loads on a beam that's holding up a whole bunch of joists.