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Converting ceiling joist to floor joist.

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Years ago I figured that sistering 2x8's to existing
2x8's doubles the stiffness, but a 2x4, glued and
screwed to the underside to form an upside down T
quadruples the stiffness . . . which about equals a


--- hadiprawira djohan <hadiprawira(--nospam--at)> 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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