Does an insulated roof need ventilation?
Enclosed attics and enclosed rafters are required by the California Residential Code to have proper ventilation. This handout is intended to provide the information regarding proper roof ventilation and insulation clearance.
What are the 4 main types of roof vents for attic ventilation?
There are 4 common types of active roof vents: turbine, power, ridge, and solar-powered vents.
Do you need roof vents on a vaulted ceiling?
A vaulted roof offers open living space directly below the rafters because there are no horizontal ceiling joists. Although there is no separate attic to vent, air circulation is still necessary to prevent heat from building up between the underside of the roof deck and the interior drywall finish.
Where are the vents on a vented roof?
The typical vented roof has a vent at the lower eave and a vent at the higher. Air can move through the attic space freely, and the floor of the attic is insulated to thermally separate the unconditioned attic from the living spaces below.
Where do you place a vent in the attic?
To install the rafter vents, staple them directly to the roof decking. Rafter vents come in 4-foot lengths and 14-1/2 and 22-1/2 inch widths for different rafter spacings. Rafter vents should be placed in your attic ceiling in between the rafters at the point where your attic ceiling meets your attic floor.
Can a roof be vented with spray foam?
The 2015 IRC outlines requirements for unvented attics, most notably that when spray foam alone is used, insulation “shall be applied in direct contact with the underside of the structural roof sheathing.” Basically, code prohibits venting when you spray foam on the underside of the roof.
What can I use to protect my rafter vents?
Note: Blown insulation may require an additional block to prevent insulation from being blown into the soffit. A piece of rigid foam board placed on the outer edge of the top plate works very well for this. 3. PLACE RAFTER VENTS