Vent Attic With Blocking Vents

The minimum recommended attic ventilation is 1 5 of your attic floor space.

Vent attic with blocking vents. Attic ventilation is a two part process. 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. Available at roofing supply stores and well stocked home centers. These vents available in 2 3 and 4 in.

Venting attic blocking gable vents home improvement library venting circulation yes any simple air block material like plastic osb or plywood can be used to block air flow into the attic through the gable vents. Intake vents located at the lowest part of the roof under the eaves allow cool. And many homes with terrible attic ventilation are completely mold free. Diameters are ideal if you have eaves but no soffits.

The photograph at left shows severe mold on the underside of roof sheathing in a 1920 s cape cod attic where there was no under roof ventilation. First air enters through the soffit vents. The soffit vents are now installed but you still need to make sure there s no insulation blocking the new vents. Make sure the airflow has a clear pathway through the insulation.

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Install them by cutting holes into the blocking between the exposed rafter tails and pressing the vents into the holes. Yet many attics with ventilation far superior to the code requirements suffer from mold issues.