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Re: Converting ceiling joist to floor joist.

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How critical is the space you're adding? Is it a high end job or is it a minimal cost remodel were dollars are everything, and the only added space is going to be a couple of guest bedrooms? "Smart" can have several meanings.

As much as L/480 (or better) is what we want, can you live with code minimum? Can you live with code minimum and analyzing the floor as a composite member using the new floor sheathing as part of the floor? Is it reasonable to reduce the live load to 30psf for sleeping rooms? Get an accurate calculation of the dead loads (6 or 7 psf vs 10, for example)? Find a bearing wall to split up the span? Strengthen every 2nd or 3rd joist with an LVL sister?

There are lots of ways to try and make the system work without going to a whole second floor, but they're only worth it if you know more about the client. In a vacuum...follow Bills advice and save yourself a bunch of headaches later.

Jordan

hadiprawira djohan wrote:

Fellow Engineers,
A fellow architect was asking me, what is the smart way to add a new story on top of an existing structure without replacing/sistering the whole ceiling joist (2x8 @16"oc) to accomodate new loadings (need 2x12@ 16"oc) assuming the wall and the foundation below are adequate. The question sounds very simple, but is it practical to build up a composite member from ex. ceiling joist? what is the practical way to go? Anybody? As always, thank you in advance! Djohan.

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