Research has shown that the amount of airflow in the vent channels of low slope roofs is very limited for roofs with less than a 3 12 pitch.
Roof venting vaulted ceiling.
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A vaulted roof offers open living space directly below the rafters because there are no horizontal ceiling joists.
For buildings located in a heating climate zone a problem often associated with inadequately ventilated improperly insulated cathedral ceiling roof assemblies is the formation of ice dams.
The question and answer article below paraphrases quotes from updates and comments an original article from solar age magazine and written by steven bliss.
You ll want a tight ceiling air barrier with no air leakage into the cathedral ceiling a critical detail for all cathedral ceiling designs.
Vent chutes should also be installed between the rafters from the soffit to the ridge to channel the airflow.
Although there is no separate attic to vent air circulation is still necessary.
Vented cathedral ceiling assemblies incorporate soffit or eave vents adequate open air space between insulation and roof deck sheathing and ridge vents.
Suggestions for un vented or hard to vent building roof cavities.
Worries about the hot roof un vented cathedral ceiling designs how to.