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Sistering attic joists.

David Schreck

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Joined
Sep 12, 2019
Messages
2
Location
Raleigh, NC
I am planning to finish a space in my attic. The existing joists are 2x6 and running about 13' from support to support on either side of center. Because of this, I am planning to attach sister 2x8s to each joist.

The planned room will sit over a load bearing wall, however, part of the existing joist structure has a recessed ceiling from our master bedroom.

My question is, when I attach the sister joists, do they need to span all the way from the center load bearing wall to the outer support walls? I am not sure how to do that with the recessed area. Or can I just go from one outer support wall across the center support wall and end them with no support. I will try to attack picture. Green is proposed room walls, orange below attic is the supporting center wall.
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Agree with fatboy. And my 2 cents ... not going to work. What is supporting the right ends of the existing joists where they die into the tray ceiling? A header?
 
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