The house was built in 1974. It, basically, is a cottage but was built to code. The fellopw who recently bought it had a pre-sale inspection and it all sounds "proper". By this I am assuming (I know, I know) ... that the walls are insulated, probably to an R7, and the sheathing is OSB. I plan to check once I get the wood siding off and if need be, and the client agrees, I will re-insulate from the outside, re-apply the sheathing and do whatever we decide after that. (added foam, foil wrap, tyvek, etc.) As mentioned, all responses and ideas are welcome. My client is a young fellow who wants proper insulation and heat control but is also budget minded. I am trying to get him the best bang for the buck. Thanks.