Anyone that puts up a pole barn without concrete footing to spread the weight over a bigger area is asking for trouble.
Lets look at what you are asking. Most soil has a bearing capacity of 2000 to 3000 lbs per sq ft. While most use 2000 lbs when no soil test was done to be conservative lets use 3000 to play into the hand of the no footing crowd. So how wide is your building? 30 ft Wall height? 10 ft Truss spacing? 8 ft
So you have two 6x6 post carrying 8 foot by 50 foot of wall and roof. Two 6x6 post has a area of .5 sq ft .5 sq ft x 3000 lbs of capacity gives you 1500 lbs of capacity Do you really think 8 ft by 50 ft of building weighs less than 1500 lbs
If you are really worried about the post sitting on a concrete footing put a layer of gravel between the concrete and the post.
Another thing most do not worry about is uplift. While uplift is not constant like down pressure is uplift comes in greater forces. You might want to add uplift protection to the post also.
Now I can sit back and read the responses from those that will say I have a 2000 yr old pole barn with no footing and 2x4 post and it hasn't sunk 1 inch.
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