Vaulted Roof Ventilation

In my proposed cathedral ceiling detail sketch at left i want to use a reflective foil between the insulation and the roof sheathing to double as a radiant barrier and a cathedral ceiling ventilation space liner.

Vaulted roof ventilation.

In no case should the amount of exhaust ventilation exceed the amount of intake ventilation. In a vaulted roof a ridge vent serves as the outtake or exhaust vent. If properly installed between the rafters on top of the ceiling material drywall plaster paneling sheets etc there should be approximately 2 of space left above it which allows air to flow between the bottom and top of the roof. Is the radiant barrier in a useful place.

27 lineal feet required. Proper ventilation even with the attic bypasses sealed and effective vapor retarders installed proper ventilation is essential to prevent moisture problems in cathedral ceilings. The roofer who did the job for the sellers says it does not. Ventsure 4 foot strip heat moisture ridge vent.

Choose one of the following products to meet the recommended exhaust nfva of 528 square inches. I m buying a house in colorado and the house has a vaulted cathedral ceiling such that both the plywood sheathing and the ceiling sheetrock are attached to opposite sides of the rafters i e. Vent the roof deck if the attic space is going to be conditioned either for living or mechanical purposes or if a home design calls for a vaulted ceiling provision r806 3 in the international residential code calls for the roof deck above the space to be vented continuously from the eave to the ridge. Cathedral vaulted or any ceiling that has insulation blocking the airflow from the soffit vents to the attic needs an attic baffle in each rafter bay.

James french suffern ny. Without an attic baffle there will not be any air space for fresh air to enter the attic from the soffit vents. Ideal installation would also include vent chutes baffles secured to roof decking which ensures proper insulation spacing and undisturbed air flow. In the case of a cathedral vault where the interior ceiling is parallel to the exterior roof line installing skylights is a simple process.

Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space. A balanced system of soffit and ridge ventilation provides continuous ventilation of hot moist air at the hottest point of the roof. Always have a balanced ventilation system. Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier.