To get an alternate approved you have to provide the engineering of the manufacturer of the exact product you are asking to be approved. You follow the prescriptive requirements (not allowed much around here anymore), get approved engineering (usually demanded around here), or get the AHJ to approve an approved alternate. Asking the question here is kind of a fun diversion asking them is more like work they have to (at least attempt to) do, and as noted, it's really the engineer's job. I kind of don't want to bother them with it, also. They're a good yard, but I don't know that I'd expect them to find a table you guys can't. I have not called the local supplier (Truitt and White). Partly it's that they are busy with what they deem as "real" work, largely it is a philosophical/professional push-back against the local AHJ's for demanding so much explicit stamped documentation for every effort to improve the wackadoo existing housing stock. They take things extremely seriously up to a point, but often push back against (paid) extra work beyond the main structural elements of a job.
Have you gone the sales rep route with the local supplier yet?It has taken me a while to accept the informal attitude of most engineers here about small (but not insignificant) changes/additional work orders. I seem to recall a joist table from maybe the early 90's but not after. When faced with similar in past I set the comparison using beam #'s then went back to lumber joist tables and imputed the lvl #'s and it was good enough for them, but that back when $5 and a bond bought a lic. I wonder if there are some burning ears or slide rules over at in their version of a 'wazzup' (comes down w/o us) type thread thread.
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