so how do the pro's do it??
hate to show my ignorance, but are the ibeams really 'ground'?

One of the BEST POSSIBLE grounds uses rebar in buried concrete;
Google for "ufer ground" and read to your heart's content.

When I had a basement built beneath my house, I installed a Ufer
ground in the footing around about half of its perimeter.

--
--Myron A. Calhoun; 2001 Dunbar Road; Manhattan, KS 66502-3907
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
NRA Life Member and Rifle, Pistol, & Home Firearm Safety Certified Instructor
Certified Instructor for the Kansas Concealed-Carry Handgun license