Around here, we are often lucky to get soil compaction tests for commercial projects of 2,000 psf. For residential, it is beyond rare that we have tests performed (I did have 1 person pay for one within the last year) just to find out it was 1,500 psf. We could have just assumed a 1,500 psf bearing capacity right from the IRC and saved him money, but that is another story.
We consistently get deck designs that have undersized piers/footings. I usually tell people to just download the DCA-6 manual and go from there but some of the deck designs are more complicated than the simple tables that they have making it hard to use realistically.
Even when we go over the requirements for simple residential stuff, it is still not what we find when we get out there.
Yesterday's inspection for a pre-pour with 12" Sono-Tube was as follows:
Rectangle deck 16 x 32, long axis with the house.
They had planned 4 - 12" sono tubes to support the beam.
The tributary load for that worked out to 3,200# per pier. Not even close.
This is based on a live-load of 40# per deck requirements and a 10# dead load.
I was not a very popular guy yesterday. I even had to explain that a 12" sonotube is only about 75% of a square foot.
Do you guys have the same problem? It seems like most inspectors in our area just don't give a crap.