I think I have decided to buy some land in Houston, AK. I am planning on starting with a 20 x 20 cabin. I can use 6 x 6 treated with post protectors or I can bring up with me some used power company poles. I think either one would work fine. I am planning on having the cabin 24"-36" above grade. Does anyone know how deep I need to go with the post/poles to stay below the frost line? Any advice is very much appreciated.