There are some styles of vaulted ceiling homes or flat roof homes that have ventilation spaces within the roof itself and no attic.
Pitcedh roof venting.
Plumbing vent pipes are connected to your drain system and are needed for water to drain properly.
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The keepa attic vent is used for ventilating attics and or plenum as a roof exhaust vent or as an air intake roof vent.
Vent roofs with steeples towers or cupolas can be found in different buildings from barns to cathedrals.
Roof ventilation in a cold climate vents moisture and ensures a cold roof temperature to avoid ice dams.
When water drains air must replace the space that was taken up by the water.
These ventilation needs are calculated differently.
Running a vent pipe out of the roof takes some careful preparation.
The enclosed void of a warm pitched roof may not require to be ventilated but this is usually subject to the requirement to install a fully sealed air and vapour control layer avcl in conjunction with an air open roof covering.
The building codes and building science for natural roof ventilation however only appeared in the 1940s.
The keepa attic vent is built exclusively for flat roof ventilation roof pitch is 2 12 or less.
It alleviates moisture in the winter and heat in the summer to extend roof membrane life.