Vent Attic With Blocking Vents

The soffit vents are now installed but you still need to make sure there s no insulation blocking the new vents.

Vent attic with blocking vents.

Available at roofing supply stores and well stocked home centers. 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. Attic ventilation is a two part process.

Yet many attics with ventilation far superior to the code requirements suffer from mold issues. Make sure the airflow has a clear pathway through the insulation. And many homes with terrible attic ventilation are completely mold free. These vents available in 2 3 and 4 in.

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. Nope venting an attic is actually pretty hard here s how ventilation is supposed to work. 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. Install them by cutting holes into the blocking between the exposed rafter tails and pressing the vents into the holes.

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. If the attic is insulated with fiberglass batts just pull back any that are blocking the flow of air.