I am presently renovating a 1940s cottage on Lake Erie that has a cement foundation and crawlspace. Over the years, time has taken its toll and now there are some joists that need repairing/replacing. What is the rule for using PT wood? I know it's usually code to use PT for mudsills but what about rim joists and interior joists? The cottage sits low to the ground and there is moisture issues to be addressed in the crawlspace. Thanks for any guidance!