Buttoning down the roof

Tom,
We very much enjoy your Saturday morning show and are hoping you might beable tohelp us out with the following :We have a 50 year old frame camp near Grand Lake Stream, Maine. Recentlywe puta new roof & skylight on it. We did not vent the roof ridge or soffits,but are now thinkingabout finishing the interior of the roof with 1 by 6 inch tongue & grovepine. It is presentlyexposed 2 by 6 rafters. We have thought about putting in some type ofinsulation, but don'twant to create a condensation problem. We use and heat the camp about 2months eachwinter. Would I be creating a problem by insulating ?We also have a 5 year old log home in Grand Lake Stream and the roofshingles areheaving. It seems to be worse along the seams of the plywood sheathing.This problemis a little more complex than I can explain in a letter and we are askingif you do troubleshooting on site. We are very willing to pay for a visit.Any help or information you can give us will be greatly appreciated.
Thankyou.
John & Lisa Bertinelli

Hi,
If I were considering this type of project, I would have installed a layerof foam before installing new roofing.Since this is not the case in your situation, I would suggest installing6"(or more if possible) fiberglass in the joist cavity and then covering itwith a layer of at least 1" foam. Since the building is not used all yearlong, this ought to be adequate. If you think you might be using ityear-round later on, install 2" of foam. You can then install strapping onthe foam and then cover it with either sheetrock or new pine. All jointsmust be caulked and well-sealed. Ventilation is not necessary if this iswell sealed.
I appreciate the offer to do a site visit, but I cannot get away to do this.It sounds like there might be a moisture issue here. I would suggest havingan experienced home inspector, who might have an engineering background.
Tom