Cathedral Ceiling Roof Venting

I built a new log home this summer and made a mistake with my cathedral roof.

Cathedral ceiling roof venting. I was told by a relative to use a new method of 1 of spray foam and roxul r30 the 1 of spray foam would be enough to not need to vent the roof. The question and answer article below paraphrases quotes from updates and comments an original article from solar age magazine and written by steven bliss. Cathedral ceilings that are properly designed to addresses the source of water vapor dissipate the movement of water vapor through the assembly and ventilate collected moisture will help to ensure long term roof system performance and enjoyment of the ceiling for years to come. It looks like min r 10 sprayed under the roof sheathing and then a full fill of the bays with batt fluffy and a vapor sealed drywall lid will get me the hot unvented roof system the sips was from the get go.

Hello just looking for a little help with my ceiling. Vaulted roof trusses are slightly misleading because the degree of vault on. Click to enlarge any image. How to avoid condensation leaks attic mold insulation mold structural damage to roof framing when roof venting is not possible cathedral roof and knee wall insulation venting air path options in older homes hot roof designs.

Some vaulted roofs don t have individual rafters but instead feature pre engineered trusses. Sketch above showing venting in a steep slope cathedral ceiling roof is courtesy of carson dunlop associates.