We have a 20 year old earth-contact house in Missouri where the upstairs ceiling is the roofline. We re-roofed last year. Shingles were crumbled and some boards were rotted. Didn't realize till later when we were installing a ceiling fan upstairs what had probably causes the roof deterioration. The insulation has no vapor barrier and the cross braces between the rafters are solid 2x6's same as the rafters themselves. Not x-shaped 2x4's like I would have expected. We have already added a ridge vent, additional eave vents and an attic fan, but are at a loss as to what to do about the complete lack of circulation under the roof. The upstairs is similar to a shed dormer with a very low pitch (almost flat) on a hip & valley roof. Is there anything else we can do at this point? We are figuring that we'll have to wait for the roof to rot again and then rip up the roof completely to do it right. Not an easy task considering the house is about 30x70. We did it all ourselves and are not looking forward to doing it again in our lifetime. Any input would be appreciated.