Vent Attic With Blocking Vents

Nope venting an attic is actually pretty hard here s how ventilation is supposed to work.

Vent attic with blocking vents.

Attic ventilation is a two part process. Intake vents located at the lowest part of the roof under the eaves allow cool. Diameters are ideal if you have eaves but no soffits. Blocked soffit vents invites attic or roof cavity moisture condensation mold the photograph at page top shows an attic whose intake venting is blocked by fiberglass insulation.

These vents available in 2 3 and 4 in. Yet many attics with ventilation far superior to the code requirements suffer from mold issues. The minimum recommended attic ventilation is 1 5 of your attic floor space. 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.

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. Available at roofing supply stores and well stocked home centers. 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. Make sure the airflow has a clear pathway through the insulation.

The soffit vents are now installed but you still need to make sure there s no insulation blocking the new vents. Install them by cutting holes into the blocking between the exposed rafter tails and pressing the vents into the holes. And many homes with terrible attic ventilation are completely mold free.