looking to purchase 1860’s log home in Milwaukee, Wisconsin area. Would like an expert to inspect to make sure this is sound. Basement has some dry rot, and floor joists have shims between the joist and floor boards, I thought to prevent squeeks but maybe worse? inside plaster in upstairs sound. also home never had a furnace, is boiler best method? no place to put duct work. ideas? suggestions? all appreciated, thank you. Shawn