My home has a normal truss built roof running North to South bisected by a cathedral ceiling roof. After about 10 years we had to replace the decking over the NW section of the cathedral roof. We had ridge vent installed at that time hopeing it would solve the moisture problem. I was up there recently and found that the new decking is badly warped up near the top. The ceiling is insulated with fiberglass bats, and since the two roof bisect each other there are no soffit vents in the cathedral sections. None of the other three sections have had any problems. Would putting plastic air channels down over the bats help even though there is only the ridge vent? How about packing in cellulose to form a "Hot Roof" as I read in one of "The Insulator's" earlier posts? I really don't want to disturb the interior drywall and textured ceiling.