In this video I walk through the process of building the insulated floor for my 10x16 shed floor. I also show detailed plans for the joist layout. This floor is insulated because this is ultimately going to be a she-shed/ studio space. This is a cheap, but very well built floor on skids using pressure treated lumber over a gravel pad.
Correction*
At the 3 minute mark I was saying 15 inches on center for my joists. I meant 16 inches!!
*Disclaimer: I'm not a professional, just a seasoned DIYer. You should double check my measurements and advice and adhere to your local building codes.