Attic Cross Ventilation

In other words the entire vent opening doesn t count as vented space.

Attic cross ventilation.

You can also contact your local municipality to check on building code in your area. Enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof rafters shall have cross ventilation for each separate space by ventilating openings protected against the entrance of rain or snow. If the attic is insulated with fiberglass batts just pull back any that are blocking the flow of air. Intake vents located at the lowest part of the roof under the eaves allow cool.

The insulation will resist heat transfer into the house. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Most building codes require a ratio of 1 150 ventilation space to attic floor space. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.

The soffit vents are now installed but you still need to make sure there s no insulation blocking the new vents. If there s blown in insulation like ours rake back the fluffy stuff with a 3 or 4 ft long 1 x 6 or use a garden rake or hoe. Proper insulation and air sealing also keeps attics cold in winter by blocking the entry of heat and moist air from below.