I have an extremely small project that is probably a waste of of an engineers or architects time but maybe someone here can refer me to someone or someplace with my info. I have a small shop that I want to add a good size loft or mezzanine. The shop is a free spanning 40x40x25’ tall, and I would like to build a loft that maintains the same free spanning design down stairs. I am unsure what the best way to approach this to have a load minimum of 50psf uniform, and a concentrate of 1000psf. The upstairs will just be for storage and office space so we want to design the floor to be easy to install and inexpensive material wise. I am tryng to pull my permits but they need to know about every nut and bolt and how far apart they are spaced first. I want to use steel beams that can make that 40’ span by 40′ long. I plan to use plywood for the top sheeting followed by carpet and maybe some tile. So design ideas other people have offered up were to run heavier duty length wise on either end of the shop followed by smaller beams width wise reting on the 1st beams then to use this lighter gauge steel stamp in a sort of U shape that runs back the opposite direction of those beams to attached the plywood to. I am not sure of the terminology. Another person said I should run a 3rd heavy beam length wise down the middle of the shop which would be free spanning but allow the beams I place on top to only need to be 20′ wide so they would not need to be as heavy duty as beams that span the entire 40′ width of the shop. I really don’t care how it is constructed just as long as it is the best use of my money and can meet the code requirements without bouncing as you walk across the floor. I was considering making the floor 2000psf concentrate just to give extra support but IDK if that means doubling the cost of materials for no particular reason besides a “just in case” sort of thing. I wish there was some sort of program I could find that could figure out my load requirements and help with my design. Ifthere are any engineers out here that want a small side job please let me know. I assume for anyone that does this for a living my jobs is almost so small it’s not worth a professionals time, but I figured I would try to leave a post here and see if I get lucky. Thanks in advance for any real help someone has to offer.