Correct Attic Ventilation

You can also contact your local municipality to check on building code in your area.

Correct attic ventilation. At first it may seem odd to add insulation for warmth and then purposely allow cold air to. Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Installing continuous soffit vents along the outer edge of the eaves adding a ridge vent insulating along the top plates to meet or exceed the r value already in the walls sealing the attic floor to make it airtight and making sure there s the recommended r value of properly installed.

Attic ventilation serves two main functions. Attic fans are intended to cool hot attics by drawing in cooler outside air from attic vents. To lower attic temperatures and to remove excess moisture. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.

Most building codes require a ratio of 1 150 ventilation space to attic floor space.