I am planning to extend my deck, which uses pier blocks as below photo
I cannot tell what's underneath this pier block because it was just dirt. There was no pour concrete for certain.
So my question is: if I extend my deck and use the pier blocks, do I need to prepare the ground with anything special? I live in Seattle area. My plan to just dig about 1 foot deep and lay 4-5 inches of aggregate 5/8" minus like from http://www.pacifictopsoils.com/products_all.htm and the pack it.
My neighbor did the same and his last for years. I just want to check for your opinion!?