Anyone have any clue of the bearing capacity of an 8″ sonotube with a 24″ bigfoot?
A crew I supervise jumped the gun and dug footings for a covered porch before the permit was in hand. I called the BI, and he said, “no big deal, I’ll come out and take a look (pre pour inspection).
So he looks, and says we can’t pour. Says the middle pier might have to be switched to a 12″ or 14″ sonotube. It has a 24″ bigfoot, and per their website, the soil as enough bearing capacity.
The porch in question is 7×17. Center pier should get 3000 lbs at psf on both roof and deck. Seems crazy, don’t you think? If someone accidentally piled a railroad car on the roof, wouldn’t the 6 x 6 wood post sitting on it fail long before the 8″ pier.