Pier and beam 1912 house
Hey looking to level a 1912 house on pier and beam. The last person to do this used what looks like old sidewalk concrete plaved just on top of the existing dirt. Its about 12 inch square and 3 inch thick.
Looking at IRC code as thats what is relevant here. Seismic d2. 25psf ground snow load. 18inch frost depth. 110mph wind speed. Single story wood framed.
My interpretation of the code:
Looking at code it looks like if it was done correctly it would be done with a footing. Around here the frost like is 18inches. Its single story ground snlw load 25psf. The IRC table says 13x6 below the frost line is what should be used.
What is the actual interpretation?
Im looking for the official code answer. What is the right way to replace these footings to insure it will last the next 100 years.
Other things that are front of mind that id also like info on:
Crawl space is less than 6 inches at the small end. So we would like to open it up to alteast 10 or so for moisture and termite. How close can one get to a footing/concrete block.
What should rhe spacing of piers be? I cannot find a table for this in the IRC. Maybe im looking in the wrong spot.