here’s my issue –

i’ve been asked to frame a building inside an existing warehouse.  the size of my structure is 40′ x 40′ and would be freestanding.  it is going to be uses to fabricate laminate and corian type custom countertops.  the countertop guy’s preferance is to not have any supports/posts for the ceiling since that would limit his layout and work methods.  he also wants to stock particleboard on the ceiling (addind insult to injury).  additional, details – 12′ walls – one story with a flat deck roof/ceiling, sheathed and insulated for heating and a/c, and a roll-up garage door.  i’m looking for the an inexpensive means to accomindate all of his request.  haven’t not dealt with steel i-beams or prefab ceiling/floor joist systems i’m looking for some advice on both as well as anything else you can think of (lvl’s and tji’s).  lastly, i think the concrete floor (6″ thick) will work given the existing loads of the racking system throughout the warehouse (vinyl siding warehouse – racks are industrial steel 5′ x 14′ stacked four high filled to the gills with siding/trim coil/everything else.  all loads here are transferred to four 3″ x 3″ post that rest on the floor).  i don’t think the countertop building will be able to generate the concentration of pressure exerted on the floor beneath the rack posts.  any advice/point in the right direction would be greatly appreciated.

thanks,

j.d.