This might not be the structural engineered approved design, but over the years I've seen many, many 'portable' buildings setting on blocks. Two that come to mind right at the moment are my storage building which is 14x16, with a second floor, and a buddies that was built back in the early 90's that was about the size you are wanting. In the case of my buddies building it wasn't unusual for him to have two cars parked inside of it at any given time.
That said the main thing with block is to insure they are turned upright, and not used lying on their side. Structurally they have very little side strengh when it comes to supporting a load and will cruch easily. Too the force of the load needs to be distributed over as much of the surface area of the block as possible for it to have any strength. In other words a single timber running lengthwise over the top of the block will be 'better supported' than one running width wise over it, unless you also use another timber, that covers the entire surface area of the block, between the two pieces.
Like I said I've seen numerous, and helped build a few, outbuildings over the years that were supported on blocks and have yet to see one of them collapse when built properly.
Good luck and post some pics for us when your done.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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