I'm building a new home, a post and beam timberframe. I'm doing the footers first, and then will pour the interior portion of the slab. I'm doing the exterior footing first, because of multiple levels on a sloped site. My quandary is... I'm going to be using the front end loader on the tractor to assist with some of the huge beams. If I pour the slab now, I'm thinking I might risk cracking the slab driving the tractor back and forth with some 40' 12" sq. beams... If I pour the interior later, I'll have some issues with moving the concrete around, through the upright beams, but I know my floor won't be ruined. I'd rather get the slab finished and out of the way. I'm using 8x20 mesh, with lots of extra rebar, in the cement... I'd like to think it'd hold the tractor, under all circumstances... But... there are very few books that deal with this situation... Anyone wrestled with this issue before?