I was just wondering if someone could point me in the right direction or provide some advise. I build a large cottage on post 11-12 years ago, 30x40. I just discovered that all my post are rotten, some more than other (evident by the sinking). I call the contractor and building material supplier, they said the posts were not rated for below ground, but at the time nobody knew that pressure treated lumber had different ratings, above and below ground. I see a guide on the canserve.org site does clearly indicate what type of posts should have been used for a below ground application like mine. However I am not sure if this was known in Fall2005, when my post where installed. http://www.canserve.org/Download/CanadianNationalSystemforCertificationofPressureTreatedWood.pdf
So, I am curious if pressure treated wood had ratings in Fall 2005? Or was there some other type of information out there that contractor and supplier would have has access to, for the selection of the proper post, or was all pressure treated lumber the same in 2005? Any thoughts on liability, the contractor, the supplier, or me the home owner?