Installing Attic Insulation Vents

Generally speaking you need a ratio of 1 300 where for every 300 square feet of ceiling space you need 1 square foot of attic ventilation.

Installing attic insulation vents.

When inspecting the attic look behind the baffles to see if there is any misplaced insulation obstructing the natural air flow and check the roof vents to make sure that outside air is exhausting properly. It is a fairly easy process that will make a world of difference in assisting your insulation and keeping your home protected from rot. Photos 1 6 show how it s done. Installing rafter vents between the rafters along the soffit on the back of the house allows for air movement.

The soffit vents are now installed but you still need to make sure there s no insulation blocking the new vents. Covering up the soffit vents with loose fill or batts which can happen if you stuff insulation along the eaves is a huge no no. To completely cover your attic floor with insulation out to the eaves you need to install rafter vents also called insulation baffles. Rafter vents ensure the soffit vents are clear and there is a channel for outside air to move into the attic at the soffits and out through the gable or ridge vent.

Installation of this type of attic ventilation involves leaving a gap in the sheathing along the ridge and covering it with a perforated vent. In order to prevent insulation from clogging each soffit vent you must also install. But before you cut any holes plan the locations of the attic vents. If the attic is insulated with fiberglass batts just pull back any that are blocking the flow of air.

Static vents often protrude from roofline thanks to. Putting baffles in your attic is a crucial step in installing attic insulation. The lack of adequate ventilation in insulated attics is a common defect. In other words the entire vent opening doesn t count as vented space.

Adding attic vents is a simple matter of cutting holes and installing vents. Mark the roof venting locations from the attic where you can see the rafters and avoid placing roofing vents over them. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. That said air resistance and interference such as vent grates reduces the area of true ventilation.

Check for a moisture barrier under the insulation. For the same reason insulation shouldn t touch the roof s underside. 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.