Fabricating a storage room inside a large warhouse

[Orn]

I am wanting to fabricate a storage room inside a large warehouse. The room will be 46 feet wide x 74 feet long x 10 foot ceiling. We will store tooling inside this room. I have the HVAC, dehumidifier, pedestrian doors and rollup door figured out, but here is my problem:
The ceiling joists of the warehouse are 16 feet from the floor. I need an open storage room - no support beams - in the new room.
I have been trying to figure out the best method to span those distances. Can I tie into the existing joists, which are steel, and if so, what would be the best way to do that? Thanks.

 

[trurle]

Depends on strength of joists. I have seen some roofs which are incredibly flimsy and likely can not safely support anything besides its own weight.
Generally, if relaying on upper roof strength, i would recommend lower roof to be made in gable shape and to connect to lower roof at one line at top of ridge through the number of short variable-length connecting rods - in this case you will have less trouble compensating for inevitable elastic deformation of upper roof.

If the upper roof is too flimsy, good solution for self-supporting large span lower roof is the saw-tooth shaped roof.

 

[Orn]

Thanks, trurle. There are substantial trusses on the warehouse made of thick steel I-beam, S8 x 23, on 25-foot centers. The joists are 4 inch steel angle x 3/8" thick. It's a pretty hefty roof structure.
Would fabricating a frame, tying that frame into the existing roof structure and then to the new ceiling members work? Or is that overkill?

 

[russ_watters]

Welcome to PF. Sorry, but this sort of thing requires a licensed architect and/or structural engineer, and a building permit, not a do-it-yourself via information from the internet. Thread closed.